阅读说明：本技术 天线装置 (Antenna device ) 是由 中野一弥 松冈保治 于 2018-12-27 设计创作，主要内容包括：本发明提供一种天线装置,具备：电介质基板,具有第1主面和第2主面；供电点,设置在电介质基板的给定位置；第1辐射元件,设置在第1主面,在给定方向上从供电点起延伸；层间连接导体,与第1辐射元件连接；第2辐射元件,设置在第2主面,在给定方向上从层间连接导体起延伸；第3辐射元件,在给定方向上从供电点起以与第1辐射元件不同的路径延伸。第1辐射元件具有在给定方向上相对于供电点远离之后折回而靠近的U字形状部分。层间连接导体与U字形状部分的折回后的部分的供电点侧的端部连接。第2辐射元件具有在电介质基板的俯视下与U字形状部分重叠的曲折形状部分。第3辐射元件具有在俯视下一边相对于第1辐射元件反复地靠近和远离一边弯曲的曲折形状部分。(The present invention provides an antenna device, comprising: a dielectric substrate having a 1 st main surface and a 2 nd main surface; a power feeding point provided at a given position of the dielectric substrate; a 1 st radiation element provided on the 1 st main surface and extending from the feeding point in a given direction; an interlayer connection conductor connected to the 1 st radiation element; a 2 nd radiation element provided on the 2 nd main surface and extending from the interlayer connection conductor in a predetermined direction; and a 3 rd radiation element extending from the feeding point in a given direction by a path different from that of the 1 st radiation element. The 1 st radiation element has a U-shaped portion which is folded back to be close after being distant from the power feeding point in a given direction. The interlayer connection conductor is connected to the end of the folded U-shaped portion on the power feeding point side. The 2 nd radiation element has a meander-shaped portion overlapping with the U-shaped portion in a plan view of the dielectric substrate. The 3 rd radiating element has a meander-shaped portion bent so as to be repeatedly close to and away from the 1 st radiating element in a plan view.)

1. An antenna device is provided with:

a dielectric substrate having a 1 st main surface and a 2 nd main surface opposed to the 1 st main surface;

a power feeding point provided at a given position of the dielectric substrate;

a 1 st radiation element provided on the 1 st main surface and extending from the feeding point in a given direction;

an interlayer connection conductor formed to penetrate the dielectric substrate and connected to the 1 st radiation element;

a 2 nd radiation element provided on the 2 nd main surface and extending from the interlayer connection conductor in the given direction; and

a 3 rd radiation element provided on either one of the 1 st main surface and the 2 nd main surface and extending from the power feeding point in the given direction by a path different from that of the 1 st radiation element,

the 1 st radiation element has a U-shaped portion that is folded back to be close after being distant from the feeding point in the given direction,

the interlayer connection conductor is connected to an end portion of the folded-back portion of the U-shaped portion on the power feeding point side,

the 2 nd radiation element has a meander-shaped portion overlapping the U-shaped portion in a plan view of the dielectric substrate,

the 3 rd radiation element has a meander-shaped portion bent so as to repeatedly approach and separate from the 1 st radiation element on one side in the plan view.

2. The antenna device of claim 1,

the 3 rd radiating element is disposed on the 2 nd major face.

3. The antenna device according to claim 1 or 2,

the meander-shaped portion and the U-shaped portion of the 2 nd radiating element are capacitively coupled to form a 1 st LC resonator,

the meander shaped portion of the 3 rd radiating element and the 1 st radiating element are capacitively coupled to form a 2 nd LC resonator,

a portion reaching an end portion of the 2 nd radiating element on the opposite side of the interlayer connection conductor in the predetermined direction from the feeding point via the 1 st radiating element and the interlayer connection conductor resonates at a 1 st frequency,

the 1 st LC resonator resonates at a 2 nd frequency higher than the 1 st frequency,

a portion reaching an end portion of the 3 rd radiating element on the opposite side from the feeding point in the given direction from the feeding point resonates at a 3 rd frequency higher than the 2 nd frequency,

a portion reaching an end portion on the feeding point side of a folded-back portion of the U-shaped portion from the feeding point resonates at a 4 th frequency higher than the 3 rd frequency,

the 2 nd LC resonator resonates at a 5 th frequency that is higher than the 4 th frequency.

4. The antenna device of claim 3,

the 1 st frequency is a frequency corresponding to a length from the interlayer connection conductor in the given direction of the 2 nd radiating element.

5. The antenna device according to claim 3 or 4,

the 2 nd frequency is a frequency corresponding to a length from the feeding point in the given direction of the 1 st radiating element.

6. The antenna device according to any of claims 3-5,

the 3 rd frequency is a frequency corresponding to a length from the feeding point in the given direction of the 3 rd radiating element.

7. The antenna device according to any one of claims 3 to 6,

the 4 th frequency is a frequency corresponding to a length from an open end of the U-shape in the given direction of the slit between the portion before folding back and the portion after folding back of the U-shape portion.

8. The antenna device according to any one of claims 3 to 7,

the 5 th frequency is a frequency corresponding to a distance between the meander shaped portion of the 3 rd radiating element and the 1 st radiating element.

9. The antenna device according to any one of claims 3 to 8,

the antenna device further includes: a passive element provided on at least one of the 1 st main surface and the 2 nd main surface and configured not to supply a signal from the power supply point,

the parasitic element does not overlap with the 1 st, 2 nd, and 3 rd radiating elements in the top view.

10. The antenna device of claim 9,

the unpowered component resonates at a 6 th frequency that is higher than the 3 rd frequency and lower than the 4 th frequency.

11. The antenna device of claim 10,

the unpowered component extends in the given direction,

the 6 th frequency is a frequency corresponding to a length in the given direction of the unpowered component.

Technical Field

The present disclosure relates to an antenna device coping with multiple frequency bands.

Background

In response to a demand for a wireless communication device to have multiple frequency bands, an antenna device that can cope with multiple frequencies has been developed (for example, patent document 1).

Prior art documents

Patent document

Patent document 1: japanese patent No. 6015944

Disclosure of Invention

In recent years, there has been a further demand for the miniaturization and multi-band realization of antenna devices at the same time. The present disclosure provides an antenna device capable of achieving both miniaturization and multiband operation.

An antenna device according to an aspect of the present disclosure includes: a dielectric substrate having a 1 st main surface and a 2 nd main surface opposed to the 1 st main surface; a power feeding point provided at a given position of the dielectric substrate; a 1 st radiation element provided on the 1 st main surface and extending from the feeding point in a given direction; an interlayer connection conductor formed to penetrate the dielectric substrate and connected to the 1 st radiation element; a 2 nd radiation element provided on the 2 nd main surface and extending from the interlayer connection conductor in the given direction; and a 3 rd radiation element provided on either one of the 1 st principal surface and the 2 nd principal surface and extending from the feeding point in the given direction by a path different from that of the 1 st radiation element. The 1 st radiation element has a U-shaped portion that is folded back to be close after being distant from the feeding point in the given direction. The interlayer connection conductor is connected to an end portion of the folded-back portion of the U-shaped portion on the power feeding point side. The 2 nd radiation element has a meander-shaped portion overlapping the U-shaped portion in a plan view of the dielectric substrate. The 3 rd radiation element has a meander-shaped portion bent so as to repeatedly approach and separate from the 1 st radiation element on one side in the plan view.

According to the antenna device of the present disclosure, miniaturization and multi-band can be achieved at the same time.

Drawings

Fig. 1A is a top perspective view of the antenna device according to the embodiment, as viewed from the 1 st main surface side.

Fig. 1B is a plan view of the antenna device according to the embodiment as viewed from the 1 st main surface side.

Fig. 1C is a plan view of the antenna device according to the embodiment as viewed from the 2 nd main surface side.

Fig. 2A is a top perspective view of the antenna device of the comparative example viewed from the 1 st main surface side.

Fig. 2B is a plan view of the antenna device of the comparative example viewed from the 1 st main surface side.

Fig. 2C is a plan view of the antenna device of the comparative example viewed from the 2 nd main surface side.

Fig. 3 is a graph showing frequency characteristics of the voltage standing wave ratios of the antenna device in the embodiment and the antenna device in the comparative example.

Fig. 4A is a diagram for explaining an example of a conventional frequency adjustment method.

Fig. 4B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 4A.

Fig. 5A is a diagram for explaining an example of a frequency adjustment method according to the embodiment.

Fig. 5B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (d) in fig. 5A.

Fig. 6A is a diagram for explaining another example of a conventional frequency adjustment method using the antenna device according to the embodiment.

Fig. 6B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 6A.

Fig. 7A is a diagram for explaining another example of the frequency adjustment method according to the embodiment.

Fig. 7B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 7A.

Fig. 8A is a diagram for explaining an example of a method of adjusting the 1 st frequency in the antenna device in the comparative example.

Fig. 8B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 8A.

Fig. 9A is a diagram for explaining an example of a method of adjusting the 1 st frequency in the antenna device according to the embodiment.

Fig. 9B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 9A.

Fig. 10A is a diagram for explaining an example of a method of adjusting the 2 nd frequency in the antenna device in the comparative example.

Fig. 10B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 10A.

Fig. 11A is a diagram for explaining an example of a method of adjusting the 2 nd frequency in the antenna device according to the embodiment.

Fig. 11B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 11A.

Fig. 12A is a diagram for explaining an example of a method of adjusting the 3 rd frequency in the antenna device according to the embodiment.

Fig. 12B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 12A.

Fig. 13A is a diagram for explaining an example of a method of adjusting the 6 th frequency in the antenna device according to the embodiment.

Fig. 13B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 13A.

Fig. 14A is a diagram for explaining an example of a method of adjusting the 4 th frequency in the antenna device according to the embodiment.

Fig. 14B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 14A.

Fig. 15 is a diagram showing an external appearance of a wireless communication device provided with the antenna device according to the embodiment.

Detailed Description

The disclosed antenna device is provided with: a dielectric substrate having a 1 st main surface and a 2 nd main surface opposed to the 1 st main surface; a power feeding point provided at a given position of the dielectric substrate; a 1 st radiation element provided on the 1 st main surface and extending from the feeding point in a given direction; an interlayer connection conductor formed to penetrate the dielectric substrate and connected to the 1 st radiation element; a 2 nd radiation element provided on the 2 nd main surface and extending from the interlayer connection conductor in the given direction; and a 3 rd radiation element provided on either one of the 1 st principal surface and the 2 nd principal surface and extending from the feeding point in the given direction by a path different from that of the 1 st radiation element. The 1 st radiation element has a U-shaped portion that is folded back to be close after being distant from the feeding point in the given direction. The interlayer connection conductor is connected to an end portion of the folded-back portion of the U-shaped portion on the power feeding point side. The 2 nd radiation element has a meander-shaped portion overlapping the U-shaped portion in a plan view of the dielectric substrate. The 3 rd radiation element has a meander-shaped portion bent so as to repeatedly approach and separate from the 1 st radiation element on one side in the plan view.

Thus, when the 1 st radiation element is designed to have the same electrical length in each of the case where the element has the U-shaped portion and the case where the element does not have the U-shaped portion, the length in the predetermined direction can be shortened in the case where the element has the U-shaped portion, and therefore, the element can be downsized (for example, can be suppressed from becoming thin and long). In addition, when the 2 nd radiating element is designed to have the same electrical length in each of the case where the element has the meandering shape portion and the case where the element does not have the meandering shape portion, the space can be effectively used by bending the conductor pattern or the like in the case where the element has the meandering shape portion, and thus the element can be downsized. Since the 3 rd radiation element also has a meander-shaped portion, the size can be reduced in the same manner.

Further, the antenna device of the present disclosure has a plurality of resonance frequencies. Specifically, (i) a portion reaching an end portion of the 2 nd radiation element on the opposite side of the interlayer connection conductor in a predetermined direction from the feeding point via the 1 st radiation element and the interlayer connection conductor, (ii) a 1 st LC resonator configured by capacitively coupling a meandering-shape portion and a U-shape portion of the 2 nd radiation element, (iii) a portion reaching an end portion of the 3 rd radiation element on the opposite side of the feeding point in the predetermined direction from the feeding point, (iv) a portion reaching an end portion of the U-shape portion on the feeding point side after being folded back from the feeding point, (v) a 2 nd LC resonator configured by capacitively coupling a meandering-shape portion of the 3 rd radiation element and the 1 st radiation element resonate at frequencies different from each other. Therefore, the antenna device can be made to cope with a plurality of frequencies, and can be made to have a plurality of frequency bands.

In this case, the portion (ii) and the portion (iv) collectively include U-shaped portions. However, when such common portions are included, if the resonant frequency of one (for example, the portion (iv)) is adjusted, the electrical length of the other (for example, the portion (ii)) is also changed, and the resonant frequency of the other is also changed. That is, for example, it is considered difficult to set the resonance frequencies of both the part (ii) and the part (iv) to desired frequencies. However, in the present disclosure, by adjusting the length from the open end to the closed end of the U-shape in a predetermined direction of the slit between the portion before folding back and the portion after folding back of the U-shaped portion, the resonance frequency of the portion (iv) can be adjusted to a desired frequency while suppressing the variation in the resonance frequency of the portion (ii). Therefore, the resonance frequencies of both the part (ii) and the part (iv) can be set to desired frequencies.

Similarly, since the portion (iii) and the portion (v) each commonly include a meandering-shaped portion, it is considered difficult to set the resonance frequency of both the portion (iii) and the portion (v) to a desired frequency. However, in the present disclosure, by adjusting the distance between the meander shaped portion and the 1 st radiating element, the resonant frequency of the portion (v) can be adjusted to a desired frequency while suppressing the variation of the resonant frequency of the portion (iii). Therefore, the resonance frequencies of both the part (iii) and the part (v) can be set to desired frequencies. In this way, a plurality of frequencies that can be handled can be set to desired frequencies.

As described above, according to the present disclosure, miniaturization and multi-band can be simultaneously achieved.

Further, the 3 rd radiating element may be disposed on the 2 nd major surface. Thus, the 3 rd radiation element and the 1 st radiation element can be opposed to each other on the 1 st main surface and the 2 nd main surface of the dielectric substrate, and therefore, the 1 st radiation element and the 3 rd radiation element can be easily capacitively coupled to each other.

Further, the meander portion of the 2 nd radiation element and the U-shaped portion may be capacitively coupled to form a 1 st LC resonator, the meander portion of the 3 rd radiation element and the 1 st radiation element may be capacitively coupled to form a 2 nd LC resonator, a portion reaching an end portion of the 2 nd radiation element opposite to the interlayer connection conductor in the predetermined direction via the 1 st radiation element and the interlayer connection conductor from the feed point may resonate at a 1 st frequency, the 1 st LC resonator may resonate at a 2 nd frequency higher than the 1 st frequency, a portion reaching an end portion of the 3 rd radiation element opposite to the feed point in the predetermined direction from the feed point may resonate at a 3 rd frequency higher than the 2 nd frequency, and a portion reaching an end portion of the U-shaped portion on the feed point side after being folded back from the feed point may resonate at a higher frequency than the feed point The 4 th frequency higher than the 3 rd frequency resonates, and the 2 nd LC resonator resonates at a 5 th frequency higher than the 4 th frequency.

Thus, the antenna device can cope with frequencies different from each other from the 1 st frequency to the 5 th frequency.

Further, the 1 st frequency may be a frequency corresponding to a length from the interlayer connection conductor in the given direction of the 2 nd radiating element. Further, the 2 nd frequency may be a frequency corresponding to a length from the feeding point in the given direction of the 1 st radiating element. Further, the 3 rd frequency may be a frequency corresponding to a length from the feeding point in the given direction of the 3 rd radiating element. Further, the 4 th frequency may be a frequency corresponding to a length from an open end of the U-shape in the given direction of the slit between the portion before folding back and the portion after folding back of the U-shape portion. Further, the 5 th frequency may be a frequency corresponding to a distance between the meander shape portion of the 3 rd radiating element and the 1 st radiating element. This enables the 1 st to 5 th frequencies to be adjusted to desired frequencies.

The antenna device may further include a parasitic element that is provided on at least one of the 1 st main surface and the 2 nd main surface and to which no signal is fed from the feeding point, and the parasitic element may not overlap with any of the 1 st radiating element, the 2 nd radiating element, and the 3 rd radiating element in the plan view. The passive element may resonate at a 6 th frequency higher than the 3 rd frequency and lower than the 4 th frequency. Thereby, the antenna device can also cope with the 6 th frequency.

Further, the passive element may extend in the predetermined direction, and the 6 th frequency may be a frequency corresponding to a length of the passive element in the predetermined direction. This enables the 6 th frequency to be adjusted to a desired frequency.

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings as appropriate. However, the above detailed description may be omitted. For example, detailed descriptions of already known matters and overlapping descriptions of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description, as will be readily understood by those skilled in the art.

In addition, the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(embodiment mode)

Hereinafter, an embodiment will be described with reference to fig. 1A to 15.

First, the overall configuration of the antenna device according to the embodiment will be described with reference to fig. 1A to 1C.

Fig. 1A is a top perspective view of the antenna device 1 according to the embodiment, as viewed from the 1 st main surface 5A side. Fig. 1B is a plan view of the antenna device 1 according to the embodiment as viewed from the 1 st main surface 5A side. Fig. 1C is a plan view of the antenna device 1 according to the embodiment as viewed from the 2 nd main surface 5B side. Fig. 1A is a view seen from the 1 st main surface 5A (front surface) side, and therefore a conductor pattern or the like provided on the 2 nd main surface 5B (rear surface) is shown by a broken line in fig. 1A.

The antenna device 1 includes: a dielectric substrate 5, a feeding point P, a 1 st radiation element 10, an interlayer connection conductor b, a 2 nd radiation element 20, a 3 rd radiation element 30, an antenna GND40, and a non-feeding element 43.

The dielectric substrate 5 is, for example, a printed wiring substrate having a 1 st main surface 5A and a 2 nd main surface 5B opposed to the 1 st main surface 5A, and is a double-sided substrate in which a conductor pattern is provided on both surfaces of the 1 st main surface 5A and the 2 nd main surface 5B. The dielectric substrate 5 has, for example, an elongated shape having a predetermined direction (x-axis direction in this case) as a longitudinal direction and a y-axis direction as a short-side direction. The shape of the dielectric substrate 5 is not limited to the elongated shape, and may be appropriately determined according to the place where the antenna device 1 is disposed, and the like.

The feeding point P is provided at a given position of the dielectric substrate 5. For example, the feeding point P is provided near the x-axis direction negative side end of the dielectric substrate 5. The power feeding point P is connected to a signal source Q as a wireless communication circuit or the like. In the drawings described later, the signal source Q may not be shown. The position at which the feeding point P is provided is not limited to the vicinity of the x-axis direction negative side end of the dielectric substrate 5, and may be appropriately determined according to the shape of the dielectric substrate 5 or the like.

The 1 st radiation element 10 is provided on the 1 st main surface 5A, connected to the feeding point P, and extends from the feeding point P in a predetermined direction (x-axis direction). Specifically, the 1 st radiation element 10 includes a straight portion 12 extending from the feeding point P to the x-axis direction positive side, and a U-shaped portion 11 connected to the x-axis direction positive side of the straight portion 12 and extending in the x-axis direction. The U-shaped portion 11 has a shape that is folded back to be close to (i.e., extended to the x-axis direction negative side) after being distant from (i.e., after being extended to the x-axis direction positive side) in the x-axis direction with respect to the power feeding point P, and the slit 13 is located between a portion before folding back and a portion after folding back of the U-shaped portion 11. The open end of the U-shaped portion 11 is located on the x-axis direction negative side of the U-shaped portion 11, and the slit 13 is provided from the open end to the closed end toward the x-axis direction positive side.

The interlayer connection conductor b is formed to penetrate the dielectric substrate 5 and connected to the 1 st radiation element 10. Specifically, the interlayer connection conductor b is connected to the end of the folded portion of the U-shaped portion 11 on the power feeding point P side (the end of the folded portion on the negative side in the x-axis direction). The interlayer connection conductor b is connected to the end portion on the negative side in the x-axis direction of the meandering portion 21 of the 2 nd radiation element 20 described later. In the antenna device 1, although not shown, an interlayer connection conductor connecting the 1 st radiation element 10 and the 3 rd radiation element 30 and an interlayer connection conductor connecting the 1 st portion 41 on the 1 st main surface 5A side and the 2 nd portion 42 on the 2 nd main surface 5B side constituting the antenna GND40 are provided in the vicinity of the feeding point P. Further, an interlayer connection conductor may be provided in addition to the interlayer connection conductor shown in the figure.

The 2 nd radiation element 20 is provided on the 2 nd main surface 5B and extends from the interlayer connection conductor B in a given direction (x-axis direction). Specifically, the 2 nd radiation element 20 includes a meandering-shape portion 21 extending from the interlayer connection conductor b to the x-axis direction positive side, and a straight-line portion 22 connected to the x-axis direction positive side end portion of the meandering-shape portion 21 and extending to the x-axis direction positive side. The meandering-shape portion 21 overlaps the U-shaped portion 11 of the 1 st radiation element 10 in a plan view of the dielectric substrate 5. The meandering shape portion 21 is formed into a meandering shape by being repeatedly bent toward the y-axis direction positive side and toward the y-axis direction negative side. The meander-shaped portion 21 and the U-shaped portion 11 are capacitively coupled to form a 1 st LC resonator LC 1.

The 3 rd radiation element 30 is provided on any one of the 1 st main surface 5A and the 2 nd main surface 5B, and extends from the feeding point P in a different path from the 1 st radiation element 10 in a predetermined direction (x-axis direction). In the present embodiment, the 3 rd radiation element 30 is provided on the 2 nd main surface 5B and is provided as a path different from the 1 st radiation element 10 provided on the 1 st main surface 5A (that is, a path through which a current flows is provided different from the 1 st radiation element 10). The 3 rd radiation element 30 includes a meandering-shape portion 31 extending to the x-axis direction positive side from an interlayer connection conductor provided in the vicinity of the feeding point P and connected to the 1 st radiation element 10, and a straight-line portion 32 connected to the x-axis direction positive side end portion of the meandering-shape portion 31 and extending to the x-axis direction positive side. The meander portion 31 is formed in a meander shape by being bent while repeatedly approaching (i.e., facing the negative side in the y-axis direction) and separating (i.e., facing the positive side in the y-axis direction) the first radiation element 10 in a plan view of the dielectric substrate 5. The meander shaped portion 31 and the straight portion 12 of the 1 st radiating element 10 are capacitively coupled to form a 2 nd LC resonator LC 2.

The antenna GND40 is a ground pattern grounded to a metal part of a casing in which the antenna device 1 is provided. In the present embodiment, the antenna GND40 is composed of the 1 st portion 41 provided on the 1 st main surface 5A and the 2 nd portion 42 provided on the 2 nd main surface 5B. The 1 st portion 41 and the 2 nd portion 42 are provided so as to overlap each other in a plan view of the dielectric substrate 5 at the end portion on the x-axis direction negative side of the dielectric substrate 5. As described above, the 1 st portion 41 and the 2 nd portion 42 are connected by the interlayer connection conductor.

The passive element 43 is provided on at least one of the 1 st main surface 5A and the 2 nd main surface 5B, and does not supply a signal from the power supply point P. In the present embodiment, the passive element 43 is provided on the 2 nd main surface 5B. The parasitic element 43 is connected to the x-axis direction positive side and y-axis direction negative side end of the 2 nd part 42 of the antenna GND40, and extends to the x-axis direction positive side. The parasitic element 43 does not overlap with the 1 st, 2 nd, and 3 rd radiation elements 10, 20, and 30 in a plan view of the dielectric substrate 5. In addition, the parasitic element 43 is not connected to the 1 st, 2 nd, and 3 rd radiating elements 10, 20, and 30.

As various conductors (the 1 st radiation element 10, the interlayer connection conductor, the 2 nd radiation element 20, the 3 rd radiation element 30, the antenna GND40, the parasitic element 43, and the like) formed on the dielectric substrate 5, for example, metals containing Al, Cu, Au, Ag, or an alloy thereof as a main component can be used.

Next, the overall configuration of the antenna device 2 according to the comparative example will be described with reference to fig. 2A to 2C.

Fig. 2A is a top perspective view of the antenna device 2 of the comparative example viewed from the 1 st main surface 5A side. Fig. 2B is a plan view of the antenna device 2 of the comparative example viewed from the 1 st main surface 5A side. Fig. 2C is a plan view of the antenna device 2 of the comparative example viewed from the 2 nd main surface 5B side. Fig. 2A is a view seen from the 1 st main surface 5A (front surface) side, and therefore the conductor pattern and the like provided on the 2 nd main surface 5B (rear surface) are shown by broken lines in fig. 2A.

The antenna device 2 includes: a dielectric substrate 5, a feed point P, a 1 st radiation element 100, an interlayer connection conductor b1, a 2 nd radiation element 200, a 3 rd radiation element 300, an antenna GND400, and a non-feed element 403.

The dielectric substrate 5 and the feeding point P are the same as those of the antenna device 1 in the embodiment, and therefore, description thereof is omitted.

The 1 st radiation element 100 is provided on the 1 st main surface 5A, connected to the feeding point P, and extends from the feeding point P in the x-axis direction. Specifically, the 1 st radiation element 100 includes a straight portion 102 extending from the feeding point P to the x-axis direction positive side, and a straight portion 101 connected to the x-axis direction positive side end portion of the straight portion 102 and extending in the x-axis direction. The length of the linear portion 101 in the y-axis direction is longer than that of the linear portion 102.

The interlayer connection conductor b1 is formed to penetrate the dielectric substrate 5 and connected to the 1 st radiation element 100. Specifically, the interlayer connection conductor b1 is connected to the end portion of the straight portion 101 on the feeding point P side (the end portion on the x-axis direction negative side and the y-axis direction negative side of the straight portion 101). The interlayer connection conductor b1 is connected to the end portion on the x-axis direction negative side of the meandering shaped portion 201 of the 2 nd radiation element 200, which will be described later. In the antenna device 2, although not shown, an interlayer connection conductor connecting the 1 st radiation element 100 and the 3 rd radiation element 300 and an interlayer connection conductor connecting the 1 st portion 401 on the 1 st main surface 5A side and the 2 nd portion 402 on the 2 nd main surface 5B side constituting the antenna GND400 are provided in the vicinity of the feeding point P. Further, an interlayer connection conductor may be provided in addition to the interlayer connection conductor shown in the figure.

The 2 nd radiation element 200 is provided on the 2 nd main surface 5B and extends from the interlayer connection conductor B1 in the x-axis direction. Specifically, the 2 nd radiation element 200 includes a meandering-shape portion 201 extending from the interlayer connection conductor b1 to the x-axis direction positive side, and a linear portion 202 connected to the x-axis direction positive side end portion of the meandering-shape portion 201 and extending to the x-axis direction positive side. The meander-shaped portion 201 overlaps the straight line portion 101 of the 1 st radiation element 100 in a plan view of the dielectric substrate 5. The meandering shape portion 201 is formed into a meandering shape by being repeatedly bent toward the y-axis direction positive side and toward the y-axis direction negative side. The meander-shaped portion 201 and the straight portion 101 are capacitively coupled to form the LC resonator LC 10.

The 3 rd radiation element 300 is provided on the 2 nd main surface 5B and extends from the feeding point P in the x-axis direction by a path different from that of the 1 st radiation element 100. The 3 rd radiation element 300 extends linearly toward the x-axis direction positive side from the interlayer connection conductor provided in the vicinity of the feeding point P and connected to the 1 st radiation element 100.

The antenna GND400 is a ground pattern grounded to a metal portion of a case where the antenna device 2 is provided. The antenna GND400 is composed of a 1 st portion 401 provided on the 1 st main surface 5A and a 2 nd portion 402 provided on the 2 nd main surface 5B. The 1 st portion 401 and the 2 nd portion 402 are provided in the vicinity of the end portion on the x-axis direction negative side of the dielectric substrate 5 so as to overlap each other in a plan view of the dielectric substrate 5. As described above, the 1 st portion 401 and the 2 nd portion 402 are connected by the interlayer connection conductor.

The passive elements 403 are provided on the 1 st main surface 5A. The parasitic element 403 is connected to an end of the 1 st portion 401 of the antenna GND400 on the x-axis direction positive side and the y-axis direction negative side, and extends toward the x-axis direction positive side. The parasitic element 403 does not overlap with the 1 st, 2 nd, and 3 rd radiation elements 100, 200, and 300 in a plan view of the dielectric substrate 5. In addition, the parasitic element 403 is not connected to the 1 st, 2 nd, and 3 rd radiating elements 100, 200, and 300.

Next, frequencies that can be handled by the antenna device 1 in the embodiment and the antenna device 2 in the comparative example will be described.

Fig. 3 is a graph showing frequency characteristics of voltage Standing Wave ratios (vswr) of the antenna device 1 according to the embodiment and the antenna device 2 according to the comparative example. The VSWR of the antenna device 2 in the comparative example is shown by a broken line, and the VSWR of the antenna device 1 in the embodiment is shown by a solid line.

As shown in fig. 3, the antenna device 2 of the comparative example can cope with the frequency bands of the parts a, B, and C in fig. 3.

However, in recent years, it is necessary to cope with 4 th generation mobile communication systems (4G), 3 rd generation mobile communication systems (3G), and the like, and a frequency band to be covered by one antenna tends to be gradually widened. In contrast, the antenna device 1 of the present embodiment can cope with not only the frequency bands of the parts a, B, and C in fig. 3 but also the frequency bands of the parts D, E, and F, and the frequency bands can be wider than the antenna device 2 of the comparative example.

Further, the antenna device 1 according to the embodiment is smaller than the antenna device 2 according to the comparative example. Specifically, when the 1 st radiation element 10 is designed to have the same electrical length in each of the case where the U-shaped portion 11 is provided and the case where the U-shaped portion is not provided, the length in the x-axis direction can be shortened in the case where the U-shaped portion 11 is provided, and therefore, downsizing (for example, slimness can be suppressed) can be achieved. In addition, when the 2 nd radiation element 20 is designed to have the same electrical length in each of the case where the bent portion 21 is provided and the case where the bent portion is not provided, the space can be effectively used by bending the conductor pattern or the like in the case where the bent portion 21 is provided, and therefore, the size can be reduced. As for the 3 rd radiation element 30, since it also has the meander shaped portion 31, miniaturization can be achieved similarly.

As described above, according to the antenna device 1 of the present disclosure, miniaturization and multi-band can be achieved at the same time.

Hereinafter, the frequency around 0.8GHz (portion a in fig. 3) is referred to as the 1 st frequency, the frequency around 1.4GHz (portion B in fig. 3) is referred to as the 2 nd frequency, the frequency around 1.7GHz (portion B in fig. 3) is referred to as the 3 rd frequency, the frequency around 2.6GHz (portions C and D in fig. 3) is referred to as the 6 th frequency, the frequency around 3.5GHz (portion E in fig. 3) is referred to as the 4 th frequency, and the frequency around 5GHz (portion F in fig. 3) is referred to as the 5 th frequency.

A portion from the feeding point P to the end (end on the positive side in the x-axis direction) of the 2 nd radiating element 20 on the opposite side to the interlayer connection conductor b in the x-axis direction via the 1 st radiating element 10 and the interlayer connection conductor b resonates at the 1 st frequency. The electrical length of this portion can be changed according to the length from the interlayer connection conductor b in the x-axis direction of the 2 nd radiation element 20. Therefore, the 1 st frequency corresponds to the length from the interlayer connection conductor b in the x-axis direction of the 2 nd radiation element 20.

The 1 st LC resonator LC1 resonates at a 2 nd frequency higher than the 1 st frequency. The LC component of the 1 st LC resonator LC1 can be changed according to the amount of overlap of the 1 st radiation element 10 and the 2 nd radiation element 20 in the plan view of the dielectric substrate 5. That is, the LC component of the 1 st LC resonator LC1 can be changed according to the length from the feeding point P in the x-axis direction of the 1 st radiating element 10. Therefore, the 2 nd frequency is a frequency corresponding to the length from the feeding point P in the x-axis direction of the 1 st radiation element 10.

A portion from the feeding point P to an end (end on the x-axis direction positive side) of the 3 rd radiation element 30 on the opposite side of the feeding point P resonates at a 3 rd frequency higher than the 2 nd frequency. The electrical length of this portion can be changed according to the length from the feeding point P in the x-axis direction of the 3 rd radiation element 30. Therefore, the 3 rd frequency corresponds to the length from the feeding point P in the x-axis direction of the 3 rd radiation element 30.

A portion from the feeding point P to an end (an end on the negative side in the x-axis direction) on the feeding point P side of the folded-back portion of the U-shaped portion 11 resonates at a 4 th frequency higher than the 3 rd frequency. The electrical length of this portion can be changed according to the length from the open end of the U-shape in the x-axis direction of the slit 13 between the portion before folding and the portion after folding of the U-shape portion 11. Therefore, the 4 th frequency is a frequency corresponding to the length from the open end of the U shape in the x-axis direction of the slit 13.

The 2 nd LC resonator LC2 resonates at a 5 th frequency higher than the 4 th frequency. The LC composition of the 2 nd LC resonator LC2 can be changed according to the distance between the meander shaped portion 31 of the 3 rd radiating element 30 and the 1 st radiating element 10. Thus, the 5 th frequency becomes a frequency corresponding to the distance between the meander shaped portion 31 and the 1 st radiating element 10.

The passive element 43 resonates at a 6 th frequency higher than the 3 rd frequency and lower than the 4 th frequency. The parasitic element 43 extends in the x-axis direction, and the 6 th frequency corresponds to the length of the parasitic element 43 in the x-axis direction.

In the embodiment, the portion resonating at the 2 nd frequency and the portion resonating at the 4 th frequency collectively include the U-shaped portion 11. However, when such common portions are included, it is considered that if the resonance frequency of one (for example, a portion that resonates at the 4 th frequency) is adjusted, the electrical length of the other (for example, a portion that resonates at the 2 nd frequency) is also changed, and the resonance frequency of the other is also changed. However, in the present disclosure, by adjusting the length of the slit 13 from the open end of the U-shape in the x-axis direction between the portion before folding back and the portion after folding back of the U-shaped portion 11, the resonance frequency of the portion resonating at the 4 th frequency can be adjusted so as to be a desired frequency while suppressing the variation in the resonance frequency of the portion resonating at the 2 nd frequency. This point will be described with reference to fig. 4A to 5B.

Fig. 4A is a diagram for explaining an example of a conventional frequency adjustment method. Fig. 4A illustrates an example of a conventional frequency adjustment method using the antenna device 2 according to the comparative example. In fig. 4A, (a) to (c), the lengths of the straight line portions 101 of the 1 st radiation element 100 in the x axis direction are different from each other, and fig. 4A (a) is the longest and fig. 4A (c) is the shortest.

Fig. 4B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 4A. The VSWR in the design of fig. 4A (a) is shown by a solid line, the VSWR in the design of fig. 4A (b) is shown by a broken line, and the VSWR in the design of fig. 4A (c) is shown by a one-dot chain line.

In the conventional frequency adjustment method, the length of the straight portion 101 in the x-axis direction is adjusted, whereby the resonance frequency can be adjusted in the frequency band of the portion a in fig. 4B. However, in conjunction with this adjustment, the resonance frequency also fluctuates in the frequency band of the portion B in fig. 4B. Thus, for example, when a multiband including 1.4GHz (2 nd frequency) and 3.5GHz (4 th frequency) is to be realized, if the resonant frequency is adjusted to 3.5GHz in the band of part a, it is difficult to realize adjustment to 1.4GHz in the band of part B.

Next, an example of the frequency adjustment method according to the embodiment will be described with reference to the antenna device 2 of the comparative example. In the embodiment, the 1 st radiation element 10 of the antenna device 1 has the U-shaped portion 11, and an example of a method of adjusting the frequency of the embodiment is a method of adjusting the length of the slit of the U-shaped portion by providing such a U-shaped portion.

Fig. 5A is a diagram for explaining an example of a frequency adjustment method according to the embodiment. In fig. 5A, (b) to (d) each of the slits 130 is provided in the straight portion 101 of the 1 st radiation element 100, and the lengths of the slits 130 in the x-axis direction are different. Fig. 5A (a) shows a case where the slit 130 is not provided, and the slit 130 is shortest in fig. 5A (b) and longest in fig. 5A (d).

Fig. 5B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (d) in fig. 5A. The VSWR in the design of fig. 5A (a) is shown by a solid line, the VSWR in the design of fig. 5A (b) is shown by a broken line, the VSWR in the design of fig. 5A (c) is shown by a one-dot chain line, and the VSWR in the design of fig. 5A (d) is shown by a two-dot chain line.

By adjusting the length of the slit 130 in the x-axis direction, the resonance frequency can be adjusted in the frequency band of the portion a in fig. 5B. On the other hand, in the frequency band of the portion B in fig. 5B, it is understood that the amount of linkage with respect to the adjustment becomes smaller than that of the portion B in fig. 4B. Thus, for example, when a multiband including 1.4GHz (2 nd frequency) and 3.5GHz (4 th frequency) is realized, although the part resonating at the 2 nd frequency and the part resonating at the 4 th frequency commonly include U-shaped parts, respectively, by adjusting the length of the slit of the U-shaped part, it is possible to suppress the fluctuation of the resonance frequency of the part resonating at the 2 nd frequency and adjust the resonance frequency of the part resonating at the 4 th frequency so as to be a desired frequency. Therefore, the resonance frequencies of both the 2 nd frequency resonance portion and the 4 th frequency resonance portion can be set to desired frequencies.

In the antenna device 1 of the embodiment, the portion resonating at the 3 rd frequency and the portion resonating at the 5 th frequency commonly include the meandering shape portion 31 of the 3 rd radiation element 30, respectively. However, when such a common portion is included, if the resonant frequency of one (for example, a portion that resonates at the 5 th frequency) is to be adjusted, the resonant frequency of the other (for example, a portion that resonates at the 3 rd frequency) also fluctuates. However, in the present disclosure, by adjusting the distance between the meander shaped portion 31 and the 1 st radiating element 10, the resonant frequency of the portion resonating at the 5 th frequency can be adjusted to a desired frequency while suppressing the variation of the resonant frequency of the portion resonating at the 3 rd frequency. This point will be described with reference to fig. 6A to 7B.

Fig. 6A is a diagram for explaining another example of a conventional frequency adjustment method. Fig. 6A illustrates an example of a conventional frequency adjustment method using the antenna device 1 according to the embodiment. In fig. 6A, (a) to (c), the lengths of the straight portions 32 of the 3 rd radiation element 30 in the x-axis direction are different from each other, and fig. 6A (a) is the longest and fig. 6A (c) is the shortest.

Fig. 6B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 6A. The VSWR in the design of fig. 6A (a) is shown by a solid line, the VSWR in the design of fig. 6A (b) is shown by a broken line, and the VSWR in the design of fig. 6A (c) is shown by a one-dot chain line.

In the conventional frequency adjustment method, the length of the straight portion 32 in the x-axis direction is adjusted, whereby the resonance frequency can be adjusted in the frequency band of the portion a in fig. 6B. However, in conjunction with this adjustment, the resonance frequency also fluctuates in the frequency band of the portion B in fig. 6B. Thus, for example, when a multiband including 1.7GHz (3 rd frequency) and 5GHz (5 th frequency) is to be realized, if the resonant frequency is adjusted to 5GHz in the band of the part a, it is difficult to realize adjustment to 1.7GHz in the band of the part B.

Next, a case will be described in which another example of the frequency adjustment method according to the embodiment is applied to the antenna device 1 according to the embodiment. Another example of the frequency adjustment method according to the embodiment is a method of adjusting the distance between the meander shaped portion 31 and the 1 st radiating element 10.

Fig. 7A is a diagram for explaining another example of the frequency adjustment method according to the embodiment. In fig. 7A (a) to (c), the length of the meandering shape portion 31 on the negative side in the y-axis direction differs, and fig. 7A (a) is the shortest and fig. 7A (c) is the longest.

Fig. 7B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 7A. The VSWR in the design of fig. 7A (a) is shown by a solid line, the VSWR in the design of fig. 7A (b) is shown by a broken line, and the VSWR in the design of fig. 7A (c) is shown by a one-dot chain line.

By adjusting the distance between the meander shaped portion 31 and the 1 st radiating element 10, the resonant frequency can be adjusted in the frequency band of the portion a in fig. 7B. On the other hand, in the frequency band of the portion B in fig. 7B, it is understood that the amount of linkage with respect to the adjustment becomes smaller than that of the portion B in fig. 6B. Thus, for example, in the case of realizing a multiband including 1.7GHz (3 rd frequency) and 5GHz (5 th frequency), the portion resonating at the 3 rd frequency and the portion resonating at the 5 th frequency include the meander shaped portion 31 in common, respectively, but by adjusting the length of the meander shaped portion 31 toward the 1 st radiating element 10, it is possible to adjust the resonant frequency of the portion resonating at the 5 th frequency so as to be a desired frequency while suppressing variation in the resonant frequency of the portion resonating at the 3 rd frequency. Therefore, the resonance frequencies of both the 3 rd frequency resonance portion and the 5 th frequency resonance portion can be set to desired frequencies.

Next, a method of adjusting the 1 st frequency to the 6 th frequency in the antenna device 1 according to the embodiment will be described with reference to fig. 8A to 14B. The 1 st frequency and the 2 nd frequency are described in comparison with the adjustment method in the antenna device 2 in the comparative example.

Fig. 8A is a diagram for explaining an example of the method of adjusting the 1 st frequency in the antenna device 2 in the comparative example. In fig. 8A, (a) to (c), the lengths of the straight portions 202 of the 2 nd radiation element 200 in the x axis direction are different from each other, and fig. 8A (a) is the longest and fig. 8A (c) is the shortest.

Fig. 8B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 8A. The VSWR in the design of fig. 8A (a) is shown by a solid line, the VSWR in the design of fig. 8A (b) is shown by a broken line, and the VSWR in the design of fig. 8A (c) is shown by a one-dot chain line.

In the method of adjusting the 1 st frequency in the antenna device 2 in the comparative example, the resonance frequency can be adjusted in the frequency band of the B portion in fig. 8B by adjusting the length of the straight line portion 202 in the x-axis direction. However, in conjunction with this adjustment, the resonance frequency also fluctuates in the frequency band of portion a in fig. 8B. This is because the 6 th frequency is a frequency of a higher harmonic of the 1 st frequency. Thus, for example, it is difficult to realize a multiband including 0.8GHz (1 st frequency) and 2.6GHz (6 th frequency).

Fig. 9A is a diagram for explaining an example of the method of adjusting the 1 st frequency in the antenna device 1 according to the embodiment. In fig. 9A, (a) to (c), the lengths of the straight portions 22 of the 2 nd radiation element 20 in the x-axis direction are different from each other, and fig. 9A (a) is the longest and fig. 9A (c) is the shortest.

Fig. 9B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 9A. The VSWR in the design of fig. 9A (a) is shown by a solid line, the VSWR in the design of fig. 9A (b) is shown by a broken line, and the VSWR in the design of fig. 9A (c) is shown by a one-dot chain line.

In the method of adjusting the 1 st frequency in the antenna device 1 in the embodiment, the length in the x-axis direction of the straight portion 22 is adjusted, whereby the resonance frequency can be adjusted in the frequency band of the portion B in fig. 9B. On the other hand, in the frequency band of the portion a in fig. 9B, it is understood that the amount of linkage with respect to the adjustment becomes smaller than that of the portion a in fig. 8B. As described above, in the antenna device 1 according to the embodiment, the adjustment of 0.8GHz (1 st frequency) can be realized while suppressing the fluctuation of other frequency bands.

Fig. 10A is a diagram for explaining an example of a method of adjusting the 2 nd frequency in the antenna device 2 in the comparative example. In fig. 10A, (a) to (c), the lengths of the straight portions 101 of the 1 st radiation element 100 in the x axis direction are different from each other, and fig. 10A (a) is the longest and fig. 10A (c) is the shortest.

Fig. 10B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 10A. The VSWR in the design of fig. 10A (a) is shown by a solid line, the VSWR in the design of fig. 10A (b) is shown by a broken line, and the VSWR in the design of fig. 10A (c) is shown by a one-dot chain line.

In the method of adjusting the 2 nd frequency in the antenna device 2 in the comparative example, the resonance frequency can be adjusted in the frequency band of the portion B in fig. 10B by adjusting the length of the straight line portion 101 in the x-axis direction. However, in conjunction with this adjustment, the resonance frequency also fluctuates in the frequency band of portion a in fig. 10B. Thus, for example, it is difficult to realize a multiband including 1.4GHz (2 nd frequency) and 3.5GHz (4 th frequency).

Fig. 11A is a diagram for explaining an example of a method of adjusting the 2 nd frequency in the antenna device 1 according to the embodiment. In fig. 11A (a) to (c), the U-shaped portion 11 of the 1 st radiation element 10 has different lengths in the x-axis direction, and fig. 11A (a) is the longest and fig. 11A (c) is the shortest.

Fig. 11B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 11A. The VSWR in the design of fig. 11A (a) is shown by a solid line, the VSWR in the design of fig. 11A (b) is shown by a broken line, and the VSWR in the design of fig. 11A (c) is shown by a one-dot chain line.

In the method of adjusting the 2 nd frequency in the antenna device 1 according to the embodiment, the resonance frequency can be adjusted in the frequency band of the portion B in fig. 11B by adjusting the length of the U-shaped portion 11 in the x-axis direction. On the other hand, in the frequency band of the portion a in fig. 11B, it is understood that the amount of linkage with respect to the adjustment becomes smaller than that of the portion a in fig. 10B. As described above, the antenna device 1 according to the embodiment can adjust 1.4GHz (2 nd frequency) while suppressing fluctuations in other frequency bands.

Fig. 12A is a diagram for explaining an example of a 3 rd frequency adjustment method in the antenna device 1 according to the embodiment. In fig. 12A (a) to (c), the lengths of the straight portions 32 of the 3 rd radiation element 30 in the x-axis direction are different from each other, and fig. 12A (a) is the longest and fig. 12A (c) is the shortest.

Fig. 12B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 12A. The VSWR in the design of fig. 12A (a) is shown by a solid line, the VSWR in the design of fig. 12A (b) is shown by a broken line, and the VSWR in the design of fig. 12A (c) is shown by a one-dot chain line.

In the method of adjusting the 3 rd frequency in the antenna device 1 in the embodiment, the length in the x-axis direction of the straight line portion 32 is adjusted, whereby the resonance frequency can be adjusted in the frequency band of the portion a in fig. 12B. For example, the 3 rd frequency can be adjusted to 1.7GHz in the frequency band of the portion a in fig. 12B.

Fig. 13A is a diagram for explaining an example of a method of adjusting the 6 th frequency in the antenna device 1 according to the embodiment. In fig. 13A, (a) to (c), the lengths of the passive elements 43 in the x-axis direction are different from each other, and fig. 13A (a) is the longest and fig. 13A (c) is the shortest.

Fig. 13B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 13A. The VSWR in the design of (a) of fig. 13A is shown by a solid line, the VSWR in the design of (b) of fig. 13A is shown by a broken line, and the VSWR in the design of (c) of fig. 13A is shown by a one-dot chain line.

In the method of adjusting the 6 th frequency in the antenna device 1 according to the embodiment, the length of the parasitic element 43 in the x-axis direction is adjusted, whereby the resonance frequency can be adjusted in the frequency band of the portion a in fig. 13B. For example, the 6 th frequency can be adjusted to 2.6GHz in the frequency band of the portion a in fig. 13B.

Fig. 14A is a diagram for explaining an example of a method of adjusting the 4 th frequency in the antenna device 1 according to the embodiment. In fig. 14A, (a) to (c), the length of the slit 13 of the U-shaped portion 11 in the 1 st radiation element 10 in the x-axis direction is different from each other, and fig. 14A (a) is the longest and fig. 14A (c) is the shortest.

Fig. 14B is a graph showing frequency characteristics of the voltage standing wave ratio at the respective designs of (a) to (c) in fig. 14A. The VSWR in the design of fig. 14A (a) is shown by a solid line, the VSWR in the design of fig. 14A (b) is shown by a broken line, and the VSWR in the design of fig. 14A (c) is shown by a one-dot chain line.

In the method of adjusting the 4 th frequency in the antenna device 1 according to the embodiment, the resonance frequency can be adjusted in the frequency band of the portion a in fig. 14B by adjusting the length of the slit 13 in the x-axis direction. For example, the 4 th frequency can be adjusted to 3.5GHz in the frequency band of the portion a in fig. 14B.

Thus, the 1 st to 6 th frequencies can be adjusted to desired frequencies.

The antenna device 1 according to the embodiment is provided in a wireless communication device such as a notebook personal computer.

Fig. 15 is a diagram showing an external appearance of a wireless communication device 50 provided with the antenna device 1 according to the embodiment. The antenna device 1 is mounted as a wireless communication device 50 on a case 51 of a notebook personal computer in which a liquid crystal display 52 is provided, for example. The antenna device 1 is not limited to a notebook personal computer, and can be applied to other wireless communication devices such as a mobile terminal.

As described above, the 1 st radiation element 10 has the U-shaped portion 11, the 2 nd radiation element 20 has the meandering-shaped portion 21, and the 3 rd radiation element 30 has the meandering-shaped portion 31, so that the antenna device 1 can be downsized.

Further, as shown in fig. 3, the antenna device 1 has a plurality of resonance frequencies. Specifically, (i) a portion reaching an end portion of the 2 nd radiation element 20 opposite to the interlayer connection conductor b in the predetermined direction from the feed point P via the 1 st radiation element 10 and the interlayer connection conductor b, (ii) a 1 st LC resonator LC1 configured by capacitively coupling the meander-shaped portion 21 of the 2 nd radiation element 20 and the U-shaped portion 11 of the 1 st radiation element 10, and (iii) a portion reaching an end portion of the 3 rd radiation element 30 opposite to the feed point P in the predetermined direction from the feed point P, (iv) the 2 nd LC resonator LC2, which is configured by capacitively coupling (v) the meandering shape portion 31 of the 3 rd radiation element 30 and the 1 st radiation element 10, and (v) a portion extending from the feeding point P to the end portion on the feeding point P side of the portion of the U-shaped portion 11 of the 1 st radiation element 10 after being folded back, resonates at different frequencies from each other. Therefore, the antenna device 1 can cope with a plurality of frequencies, and can be configured in multiple frequency bands.

At this time, by adjusting the length of the slit 13 from the open end of the U-shape in the predetermined direction, the resonance frequency of the portion (iv) can be adjusted to a desired frequency while suppressing the variation in the resonance frequency of the portion (ii). Further, by adjusting the distance between the meander shaped portion 31 of the 3 rd radiating element 30 and the 1 st radiating element 10, the resonance frequency of the portion (v) can be adjusted to a desired frequency while suppressing the variation of the resonance frequency of the portion (iii).

Further, the 1 st frequency to the 5 th frequency can be adjusted to desired frequencies. Specifically, the 1 st frequency can be set to a desired frequency according to the length from the interlayer connection conductor b in a predetermined direction of the 2 nd radiation element 20. The 2 nd frequency can be set to a desired frequency according to the length from the feeding point P in a given direction of the 1 st radiation element 10. The 3 rd frequency can be set to a desired frequency according to the length from the feeding point P in a given direction of the 3 rd radiation element 30. The 4 th frequency can be set to a desired frequency according to the length from the open end of the U-shape in a predetermined direction of the slit 13. The 5 th frequency can be set to a desired frequency according to the distance between the meander shaped portion 31 of the 3 rd radiating element 30 and the 1 st radiating element 10.

Further, since the 3 rd radiation element 30 is provided on the 2 nd main surface 5B, the 3 rd radiation element 30 and the 1 st radiation element 10 can be opposed to each other on the 1 st main surface 5A and the 2 nd main surface 5B of the dielectric substrate 5, it becomes easy to capacitively couple the meander shape portion 31 of the 3 rd radiation element 30 and the 1 st radiation element 10.

Further, since the antenna device 1 further includes the parasitic element 43 extending in a predetermined direction, it can cope with the 6 th frequency. Specifically, the 6 th frequency can be set to a desired frequency according to the length of the passive element 43 in a predetermined direction.

(other embodiments)

As described above, the embodiments have been described as technical examples in the present disclosure. Accordingly, additional figures and detailed description are provided.

Therefore, the components described in the attached drawings and the detailed description may include not only components necessary to solve the problem but also components not necessary to solve the problem in order to exemplify the above-described technology. Therefore, it is not intended that these unnecessary components be described in the drawings and detailed description added herein, but rather that these unnecessary components be immediately recognized as being essential.

The above-described embodiments are intended to exemplify the technology in the present disclosure, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents. Further, each component described in the above embodiments may be combined to form a new embodiment.

For example, in the above embodiment, the 3 rd radiation element 30 is provided on the 2 nd main surface 5B, but may be provided on the 1 st main surface 5A.

For example, in the above embodiment, the antenna device 1 includes the parasitic element 43, but may not include it.

For example, in the above embodiment, the predetermined direction is the x-axis direction (the longitudinal direction of the dielectric substrate 5), but the present invention is not limited thereto, and may be appropriately determined according to the shape of the dielectric substrate 5 and the like.

Industrial applicability

The present disclosure can be applied to a wireless communication apparatus. Specifically, the present disclosure can be applied to a mobile phone, a smartphone, a tablet terminal, a notebook personal computer, a wireless LAN router, and the like.

Description of the symbols

1. 2 an antenna device;

5a dielectric substrate;

5A the 1 st major surface;

5B the 2 nd main surface;

10. 100, a 1 st radiating element;

11U-shaped portions;

12. 22, 32, 101, 102, 202 straight portions;

13. 130 slits;

20. 200 a 2 nd radiating element;

21. 31, 201 zigzag shaped portion;

30. 300 a 3 rd radiating element;

40. 400 antenna GND;

41. 401 part 1;

42. 402 part 2;

43. 403 no power supply element;

50 a wireless communication device;

51 a housing;

52 a liquid crystal display;

b. b1 interlayer connection conductor;

LC 11 st LC resonator;

LC 22 nd LC resonator;

an LC10 LC resonator;

a P power supply point;

and a Q signal source.