阅读说明：本技术 天线结构 (Antenna structure ) 是由 李昀灿 曾世贤 于 2018-06-12 设计创作，主要内容包括：一种天线结构。该天线结构包括基板、第一天线、第二天线、接地件、第一馈入件及第二馈入件；第一天线及第二天线设置在基板上,第一天线包括第一辐射部、第二辐射部、第一馈入部及第一接地部；第二天线包括第三辐射部、第四辐射部、第二馈入部及第二接地部；接地件耦接于第一接地部与第二接地部；第一馈入件包括第一馈入端及第一接地端,第一馈入端耦接于第一馈入部,第一接地端耦接于接地件；第二馈入件包括第二馈入端及第二接地端,第二馈入端耦接于第二馈入部,第二接地端耦接于接地件；第二辐射部与第一接地部之间具有第一间隔,第四辐射部与第二接地部之间具有第二间隔。本发明提高两个天线之间的隔离度、减少相互干扰而保有天线原本的特性。(An antenna structure. The antenna structure comprises a substrate, a first antenna, a second antenna, a grounding piece, a first feed-in piece and a second feed-in piece; the first antenna and the second antenna are arranged on the substrate, and the first antenna comprises a first radiation part, a second radiation part, a first feed-in part and a first grounding part; the second antenna comprises a third radiation part, a fourth radiation part, a second feed-in part and a second grounding part; the grounding piece is coupled with the first grounding part and the second grounding part; the first feed-in element comprises a first feed-in end and a first grounding end, the first feed-in end is coupled with the first feed-in part, and the first grounding end is coupled with the grounding element; the second feed-in element comprises a second feed-in end and a second grounding end, the second feed-in end is coupled with the second feed-in part, and the second grounding end is coupled with the grounding element; a first interval is formed between the second radiation part and the first grounding part, and a second interval is formed between the fourth radiation part and the second grounding part. The invention improves the isolation between the two antennas, reduces mutual interference and keeps the original characteristics of the antennas.)

1. An antenna structure, comprising:

a substrate;

a first antenna disposed on the substrate, wherein the first antenna includes a first radiation portion, a second radiation portion, a first feed-in portion coupled between the first radiation portion and the second radiation portion, and a first ground portion coupled to the first feed-in portion;

a second antenna disposed on the substrate, wherein the second antenna includes a third radiating portion, a fourth radiating portion, a second feeding portion coupled between the third radiating portion and the fourth radiating portion, and a second grounding portion coupled to the second feeding portion;

a grounding part coupled to the first grounding part and the second grounding part;

a first feeding element, including a first feeding end coupled to the first feeding portion and a first ground end coupled to the ground element, for feeding a first signal; and

a second feeding element, including a second feeding end coupled to the second feeding portion and a second ground end coupled to the ground element, for feeding a second signal;

the first feed end and the first radiation part form a first current path, the first feed end and the second radiation part form a second current path, the first feed end and the first grounding part form a first grounding current path, and the first current path, the second current path and the first grounding current path are not overlapped;

the second feed-in terminal and the third radiating part form a third current path, the second feed-in terminal and the fourth radiating part form a fourth current path, the second feed-in terminal and the second grounding part form a second grounding current path, and the third current path, the fourth current path and the second grounding current path are not overlapped.

2. The antenna structure of claim 1, wherein the first ground portion is directly connected to the second ground portion.

3. The antenna structure of claim 1, wherein the first ground portion and the second ground portion are separated from each other.

4. The antenna structure of claim 1, wherein the first ground is coupled to the ground at a first ground, and a first electrical length between the first feeding end and the first ground is 1/4 wavelengths corresponding to a center frequency in a lowest operating band of the first antenna; the second grounding part is coupled to the grounding part at a second grounding point, and a second electrical length is between the second feed end and the second grounding point, wherein the second electrical length is 1/4 times of the wavelength corresponding to a center frequency in a lowest operating frequency band of the second antenna.

5. The antenna structure of claim 1, wherein the first ground portion includes a first ground structure and a first impedance element coupled to the first ground structure, the second ground portion includes a second ground structure and a second impedance element coupled to the second ground structure, and the first impedance element and the second impedance element respectively include a resistor, an inductor, or a capacitor.

6. The antenna structure of claim 1, wherein the first radiating portion is capable of generating a first operating frequency band, the second radiating portion is capable of generating a second operating frequency band, the third radiating portion is capable of generating a third operating frequency band, and the fourth radiating portion is capable of generating a fourth operating frequency band; the frequency ranges of the first operating band and the third operating band are between 2400MHz and 2500MHz, and the frequency ranges of the second operating band and the fourth operating band are between 5000MHz and 6000 MHz.

7. The antenna structure of claim 1, wherein the first antenna further comprises a third ground portion coupled to the first feeding portion, and the second antenna further comprises a fourth ground portion coupled to the second feeding portion; the first grounding part and the second grounding part are positioned between the third grounding part and the fourth grounding part.

8. The antenna structure of claim 7, wherein the first antenna further comprises a first parasitic element, the first parasitic element is coupled to the ground element, the first parasitic element has a first parasitic portion coupled to the ground element and a second parasitic portion bent from the first parasitic portion and extending in a direction away from the first feeding portion; the second antenna further includes a second parasitic element coupled to the ground element, the second parasitic element having a third parasitic portion coupled to the ground element and a fourth parasitic portion bent from the third parasitic portion and extending in a direction away from the second feeding portion.

9. The antenna structure of claim 1, wherein the first radiating portion and the fourth radiating portion both extend in a first direction, the second radiating portion and the third radiating portion both extend in a second direction, and the first direction and the second direction are different from each other.

10. An antenna structure, comprising:

a substrate;

a first antenna disposed on the substrate, wherein the first antenna includes a first radiation portion, a second radiation portion, a first feed-in portion coupled between the first radiation portion and the second radiation portion, and a first ground portion coupled to the first feed-in portion;

a second antenna disposed on the substrate, wherein the second antenna includes a third radiating portion, a fourth radiating portion, a second feeding portion coupled between the third radiating portion and the fourth radiating portion, and a second grounding portion coupled to the second feeding portion;

a grounding part coupled to the first grounding part and the second grounding part;

a first feeding element, including a first feeding end coupled to the first feeding portion and a first ground end coupled to the ground element, for feeding a first signal; and

a second feeding element, including a second feeding end coupled to the second feeding portion and a second ground end coupled to the ground element, for feeding a second signal;

the second radiation part has a first interval with the first grounding part, and the fourth radiation part has a second interval with the second grounding part.

Technical Field

The present invention relates to an antenna structure, and more particularly, to an antenna structure capable of improving isolation between two antennas.

Background

First, as the usage rate of portable electronic devices (e.g., smart phones, tablet computers, notebook computers) is increasing, wireless communication technology of portable electronic devices has been emphasized in recent years. However, in recent years, much emphasis has been placed on developing miniaturized product designs, so that the space where two antennas can be originally placed in a notebook computer is greatly reduced. However, as the space for disposing is reduced, when two antennas are disposed adjacent to each other, the two antennas interfere with each other, thereby degrading the characteristics of the antennas originally designed.

Therefore, it is an important subject to be solved by those skilled in the art to provide an antenna structure capable of improving the isolation between two antennas, reducing the mutual interference between the two antennas, and maintaining the characteristics of the original antennas.

Therefore, it is desirable to provide an antenna structure to solve the above problems.

Disclosure of Invention

The present invention provides an antenna structure capable of improving isolation between two antennas, aiming at the deficiencies of the prior art.

In order to solve the above technical problem, one of the technical solutions of the present invention is to provide an antenna structure, which includes a substrate, a first antenna, a second antenna, a grounding element, a first feeding element, and a second feeding element; the first antenna is arranged on the substrate, wherein the first antenna comprises a first radiation part, a second radiation part, a first feed-in part coupled between the first radiation part and the second radiation part, and a first grounding part coupled with the first feed-in part; the second antenna is arranged on the substrate and comprises a third radiation part, a fourth radiation part, a second feed-in part coupled between the third radiation part and the fourth radiation part and a second grounding part coupled with the second feed-in part; the grounding piece is coupled with the first grounding part and the second grounding part; the first feed-in element comprises a first feed-in end and a first grounding end, wherein the first feed-in end is coupled with the first feed-in part, the first grounding end is coupled with the grounding element, and the first feed-in element is used for feeding in a first signal; the second feed-in element comprises a second feed-in end and a second grounding end, the second feed-in end is coupled with the second feed-in part, the second grounding end is coupled with the grounding element, and the second feed-in element is used for feeding in a second signal; the first feed end and the first radiation part form a first current path, the first feed end and the second radiation part form a second current path, the first feed end and the first grounding part form a first grounding current path, and the first current path, the second current path and the first grounding current path are not overlapped; the second feed-in terminal and the third radiating part form a third current path, the second feed-in terminal and the fourth radiating part form a fourth current path, the second feed-in terminal and the second grounding part form a second grounding current path, and the third current path, the fourth current path and the second grounding current path are not overlapped.

In order to solve the above technical problem, another technical solution of the present invention is to provide an antenna structure, which includes a substrate, a first antenna, a second antenna, a grounding element, a first feeding element, and a second feeding element; the first antenna is arranged on the substrate, wherein the first antenna comprises a first radiation part, a second radiation part, a first feed-in part coupled between the first radiation part and the second radiation part, and a first grounding part coupled with the first feed-in part; the second antenna is arranged on the substrate and comprises a third radiation part, a fourth radiation part, a second feed-in part coupled between the third radiation part and the fourth radiation part and a second grounding part coupled with the second feed-in part; the grounding piece is coupled with the first grounding part and the second grounding part; the first feed-in element comprises a first feed-in end and a first grounding end, wherein the first feed-in end is coupled with the first feed-in part, the first grounding end is coupled with the grounding element, and the first feed-in element is used for feeding in a first signal; the second feed-in element comprises a second feed-in end and a second grounding end, the second feed-in end is coupled with the second feed-in part, the second grounding end is coupled with the grounding element, and the second feed-in element is used for feeding in a second signal; the second radiation part has a first interval with the first grounding part, and the fourth radiation part has a second interval with the second grounding part.

One of the benefits of the present invention is that the antenna structure provided in the embodiment of the present invention can reduce mutual current interference between the first antenna and the second antenna by using the technical scheme that the grounding element is coupled to the first grounding portion of the first antenna and the second grounding portion of the second antenna, so as to improve the isolation between the first antenna and the second antenna.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.

Drawings

Fig. 1 is a schematic top view of an antenna structure according to a first embodiment of the present invention.

Fig. 2 is a schematic top view of another embodiment of the antenna structure according to the first embodiment of the present invention.

Fig. 3 is a schematic diagram of a current path of the antenna structure of fig. 2.

Fig. 4 is a graph of voltage standing wave ratio at different frequencies for the antenna structure of fig. 2.

Fig. 5 is a graph of the isolation of the antenna structure of fig. 2 at different frequencies.

Fig. 6 is a schematic top view of another embodiment of the antenna structure according to the first embodiment of the present invention.

Fig. 7 is a schematic top view of another embodiment of the antenna structure according to the first embodiment of the present invention.

Fig. 8 is a schematic top view of an antenna structure according to a second embodiment of the present invention.

Fig. 9 is a schematic top view of another embodiment of an antenna structure according to a second embodiment of the present invention.

Fig. 10 is a schematic top view of another embodiment of an antenna structure according to a second embodiment of the present invention.

Description of the main element symbols:

Detailed Description

The following is a description of the embodiments of the present disclosure related to "antenna structure" by specific embodiments, and those skilled in the art can understand the advantages and effects of the present disclosure from the disclosure of the present disclosure. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not drawn to scale, and are not intended to be described in advance. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or from one signal to another signal. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.

[ first embodiment ]

First, referring to fig. 1, fig. 1 is a schematic top view of an antenna structure according to a first embodiment of the present invention. The invention provides an antenna structure U, which comprises a substrate S, a first antenna 1, a second antenna 2, a grounding piece 3, a first feed-in piece 4 and a second feed-in piece 5. For example, the first antenna 1 and the second antenna 2 may be disposed on a substrate S. For example, the first antenna 1 and the second antenna 2 may be a metal sheet, a metal wire or other conductive body with conductive effect, and the substrate S may be a Printed Circuit Board (PCB), but the invention is not limited to the above examples. For example, the antenna structure U may be a Multi-input Multi-output (MIMO) antenna structure, but the invention is not limited thereto.

In view of the above, referring to fig. 1, the first antenna 1 may include a first radiation portion 11, a second radiation portion 12, a first feeding portion 13 coupled between the first radiation portion 11 and the second radiation portion 12, and a first grounding portion 14 coupled to the first feeding portion 13. In addition, the second antenna 2 may be adjacent to the first antenna 1, and the second antenna 2 may include a third radiation portion 21, a fourth radiation portion 22, a second feeding portion 23 coupled between the third radiation portion 21 and the fourth radiation portion 22, and a second grounding portion 24 coupled to the second feeding portion 23. Further, the grounding member 3 may be coupled to the first grounding portion 14 and the second grounding portion 24. It should be noted that the first radiation portion 11, the second radiation portion 12, the first feeding portion 13 and the first grounding portion 14 may be a metal sheet formed integrally. In addition, the third radiation portion 21, the fourth radiation portion 22, the second feeding portion 23 and the second grounding portion 24 may be a metal sheet formed integrally. In addition, preferably, the first and second grounding parts 14 and 24 may be located between the first and second feeding parts 13 and 23 such that the first and second grounding parts 14 and 24 are adjacent to each other.

With reference to fig. 1, in the first embodiment, the first ground portion 14 of the first antenna 1 can be directly connected to the second ground portion 24 of the second antenna 2 to form a common ground portion (not numbered in the figure, formed by the first ground portion 14 and the second ground portion 24), so that the first antenna 1 and the second antenna 2 are integrally formed to form a metal sheet, but the invention is not limited thereto. In other words, in the first embodiment, the first antenna 1 and the second antenna 2 have a common ground structure. In addition, in the second embodiment, the first ground part 14 of the first antenna 1 may be adjacent to and separated from the second ground part 24 of the second antenna 2.

In view of the above, referring to fig. 1, the first feeding element 4 may include a first feeding end 41 and a first ground end 42, the first feeding end 41 may be coupled to the first feeding portion 13, the first ground end 42 may be coupled to the ground element 3, and the first feeding element 4 may be configured to feed a first signal. In addition, the second feeding element 5 may include a second feeding end 51 and a second ground end 52, the second feeding end 51 may be coupled to the second feeding portion 23, the second ground end 52 may be coupled to the ground element 3, and the second feeding element 5 may be configured to feed a second signal. For example, the first feeding element 4 and the second feeding element 5 can be a Coaxial cable (Coaxial cable), but the invention is not limited thereto. In addition, it should be noted that the coupling in the present invention can be directly or indirectly connected, or directly or indirectly connected, and the present invention is not limited thereto.

Next, referring to fig. 1 again, the shape and characteristics of the first antenna 1 may be similar to those of the second antenna 2, and therefore, the first antenna 1 and the second antenna 2 may be symmetrically disposed as shown in fig. 1, but the invention is not limited thereto, that is, in other embodiments, the characteristics of the first antenna 1 and the second antenna 2 may be different from each other. Further, the first radiation portion 11 and the fourth radiation portion 22 may both extend toward a first direction (negative x direction), and the second radiation portion 12 and the third radiation portion 21 may both extend toward a second direction (positive x direction), the first direction and the second direction being different from each other. For example, in the embodiment of fig. 1, the first direction and the second direction are opposite to each other.

In view of the above, referring to fig. 1, the first radiation portion 11 can generate a first operating frequency band, the second radiation portion 12 can generate a second operating frequency band, the third radiation portion 21 can generate a third operating frequency band, and the fourth radiation portion 22 can generate a fourth operating frequency band. Further, the frequencies of the first operating band and the third operating band may range from 2400MHz to 2500MHz, and the frequencies of the second operating band and the fourth operating band may range from 5000MHz to 6000MHz, which should not be construed as a limitation to the invention.

In view of the above, referring to fig. 1, a first spacing W1 may be formed between the second radiation portion 12 and the first grounding portion 14, and a second spacing W2 may be formed between the fourth radiation portion 22 and the second grounding portion 24. Thereby, the first radiation part 11, the second radiation part 12 and the first feeding part 13 can form a shape like a T-shape by the arrangement of the first space W1. In addition, through the arrangement of the second space W2, the third radiation part 21, the fourth radiation part 22 and the second feeding part 23 can form a shape similar to a T-shape.

In view of the above, referring to fig. 1, the first ground portion 14 may be coupled to the ground element 3 at a first ground G1, and a first electrical length between the first feeding end 41 and the first ground G1 may be 1/4 times the wavelength corresponding to a center frequency in a lowest operating frequency band of the first antenna 1. In other words, for the embodiment of fig. 1, the lowest operating frequency band of the first antenna 1 may be 2400MHz to 2500 MHz. In addition, the second ground portion 24 may be coupled to the ground element 3 at a second ground G2, and a second electrical length between the second feeding end 51 and the second ground G2 may be 1/4 wavelengths times the wavelength corresponding to a center frequency in a lowest operating frequency band of the second antenna 2. In other words, for the embodiment of fig. 1, the lowest operating frequency band of the second antenna 2 may be 2400MHz to 2500 MHz.

Next, referring to fig. 1 and fig. 2 together, fig. 2 is a schematic top view of an antenna structure according to another embodiment of the first embodiment of the present invention. As can be seen from a comparison between fig. 2 and fig. 1, the biggest difference between fig. 2 and fig. 1 is that, in the embodiment of fig. 2, the first antenna 1 may further include a third ground portion 15 coupled to the first feeding portion 13, the second antenna 2 may further include a fourth ground portion 25 coupled to the second feeding portion 23, and the first ground portion 14 and the second ground portion 24 may be located between the third ground portion 15 and the fourth ground portion 25. That is, the third and fourth ground portions 15 and 25 are arranged so that the first and second antennas 1 and 2 form a planar inverted-F antenna (PIFA). Further, the impedance matching and the bandwidth of the first antenna 1 can be adjusted by the third ground 15, and the impedance matching and the bandwidth of the second antenna 2 can be adjusted by the fourth ground 25.

In view of the above, please refer to fig. 1 and also refer to fig. 3, and fig. 3 is a schematic diagram of a current path of the antenna structure of fig. 2. In detail, the first feeding element 4 is used for feeding a first signal, so that the first feeding terminal 41 and the first radiating portion 11 can form a first current path P1, the first feeding terminal 41 and the second radiating portion 12 can form a second current path P2, the first feeding terminal 41 and the first grounding portion 14 form a first grounding current path L1, and based on the characteristic that the current will have the shortest path, the first current path P1, the second current path P2 and the first grounding current path L1 do not overlap each other. In addition, the second feeding element 5 is used for feeding a second signal, so the second feeding end 51 and the third radiating portion 21 can form a third current path P3, the second feeding end 51 and the fourth radiating portion 22 can form a fourth current path P4, the second feeding end 51 and the second grounding portion 24 can form a second grounding current path L2, and the third current path P3, the fourth current path P4 and the second grounding current path L2 are not overlapped with each other based on the characteristic that the current will take the shortest path. In other words, in order to achieve the effect that the first current path P1, the second current path P2, and the first ground current path L1 do not overlap with each other, the first distance W1 between the second radiation portion 12 and the first ground portion 14 described above can be used to achieve the effect that the third current path P3, the fourth current path P4, and the second ground current path L2 do not overlap with each other, and the second distance W2 between the fourth radiation portion 22 and the second ground portion 24 described above can be used to achieve the effect that the first current path P1, the second current path P2, and the first ground current path L1 do not overlap with each other.

Next, referring to fig. 4 and the following table 1, fig. 4 is a graph of Voltage Standing Wave Ratio (VSWR) of the antenna structure of fig. 2 at different frequencies.

TABLE 1

Node point	Frequency (MHz)	Voltage standing wave ratio
			M1	2400	1.68
M2	2450	1.43
			M3	2500	1.66
M4	5150	1.98
			M5	5450	1.60
M6	5850	1.76

Next, referring to fig. 5 and the following table 2, fig. 5 is a graph illustrating isolation of the antenna structure of fig. 2 at different frequencies.

TABLE 2

Node point	Frequency (MHz)	Isolation (dB)
			M1	2400	-21.98
M2	2450	-24.94
			M3	2500	-29.11
M4	5150	-24.33
			M5	5450	-23.71
M6	5850	-20.33

Next, referring to fig. 2 and fig. 6 together, fig. 6 is a schematic top view of another embodiment of the antenna structure according to the first embodiment of the present invention. As can be seen from a comparison between fig. 6 and fig. 2, in the embodiment of fig. 6, the first ground portion 14 may include a first ground structure 141 and a first impedance element 142 coupled to the first ground structure 141, for example, the first impedance element 142 may include a resistor, an inductor or a capacitor. In addition, the second ground portion 24 may include a second ground structure 241 and a second impedance element 242 coupled to the second ground structure 241, for example, the second impedance element 242 may include a resistor, an inductor or a capacitor. In other words, the first ground portion 14 may have the first impedance element 142 connected in series on the first ground current path L1, and the second ground portion 24 may have the second impedance element 242 connected in series on the second ground current path L2. Preferably, the first impedance element 142 and the second impedance element 242 may be inductors or capacitors, since the resistance may affect the gain, but the invention is not limited thereto. It should be noted that the first electrical length of the first ground portion 14 provided with the first impedance element 142 is still equivalent to 1/4 times the wavelength corresponding to a center frequency in a lowest operating frequency band of the first antenna 1. In addition, the second ground portion 24 of the second impedance element 242 is provided, and the second electrical length thereof is still equivalent to 1/4 times the wavelength corresponding to a center frequency in a lowest operation frequency band of the second antenna 2.

Next, referring to fig. 2 and fig. 7 together, fig. 7 is a schematic top view of another embodiment of the antenna structure according to the first embodiment of the present invention. As can be seen from a comparison between fig. 7 and fig. 2, in the embodiment of fig. 7, the first antenna 1 may further include a first parasitic element 16, the first parasitic element 16 may be disposed on the substrate S, the first parasitic element 16 may be coupled to the ground element 3, the first parasitic element 16 may have a first parasitic portion 161 coupled to the ground element 3 and a second parasitic portion 162 bent from the first parasitic portion 161 and extending in a direction away from the first feeding portion 13, and the second parasitic portion 162 may be adjacent to the first radiating portion 11. In addition, the second antenna 2 may further include a second parasitic element 26, the second parasitic element 26 may be disposed on the substrate S, the second parasitic element 26 may be coupled to the ground element 3, the second parasitic element 26 may have a third parasitic portion 261 coupled to the ground element 3 and a fourth parasitic portion 262 bent from the third parasitic portion 261 and extending in a direction away from the second feeding portion 23, and the fourth parasitic portion 262 may be adjacent to the third radiating portion 21.

In view of the above, referring to fig. 7, preferably, the gain of the first operating frequency band of the first antenna 1 can be increased by the first parasitic element 16, and the gain of the second operating frequency band of the second antenna 2 can be increased by the second parasitic element 26. It should be noted that the first parasitic element 16 and the second parasitic element 26 may be disposed at the same time or alternatively disposed to adjust the gain of the first antenna 1 and/or the second antenna 2, which is not limited in the present invention.

Further, referring to fig. 7, a first predetermined slit R1 may be formed between the second parasitic portion 162 of the first parasitic element 16 and the first radiating portion 11 (i.e., a distance between the second parasitic portion 162 of the first parasitic element 16 and the first radiating portion 11). Meanwhile, by adjusting the first predetermined slit R1 of the second parasitic element 162 with respect to the first radiating element 11, the impedance value corresponding to the center frequency of the first operating frequency band of the first antenna 1 can be adjusted, and thus the voltage standing wave ratio value corresponding to the center frequency of the operating frequency band can be adjusted. In addition, further, a second predetermined slit R2 may be provided between the fourth parasitic part 262 of the second parasitic element 26 and the third radiating part 21 (i.e. the distance between the fourth parasitic part 262 of the second parasitic element 26 and the third radiating part 21). Meanwhile, by adjusting the second predetermined slit R2 of the fourth parasitic element 262 with respect to the third radiating element 21, the impedance value corresponding to the center frequency of the third operating frequency band of the second antenna 2 can be adjusted, and thus the voltage standing wave ratio value corresponding to the center frequency of the operating frequency band can be adjusted. It should be noted that, in other embodiments, the antenna structure U having the first parasitic element 16 and the second parasitic element 26 may further include a first impedance element 142 and/or a second impedance element 242 (not shown) as shown in fig. 6, which is not limited to the above.

[ second embodiment ]

First, referring to fig. 8, fig. 8 is a schematic top view illustrating an antenna structure according to a second embodiment of the present invention. As can be seen from a comparison between fig. 8 and fig. 1, the greatest difference between the second embodiment and the first embodiment is that: in the second embodiment, the first ground portion 14 and the second ground portion 24 are separated from each other. Further, the first grounding portion 14 and the second grounding portion 24 may have a predetermined distance D therebetween. In addition, other structural features shown in the second embodiment are similar to those described in the foregoing embodiments, and are not repeated herein.

Next, referring to fig. 9, fig. 9 is a schematic top view of an antenna structure according to another embodiment of the second embodiment of the present invention. As can be seen from a comparison between fig. 9 and fig. 8, in the embodiment of fig. 9, the first ground portion 14 may include a first ground structure 141 and a first impedance element 142 coupled to the first ground structure 141. In addition, the second ground portion 24 may include a second ground structure 241 and a second impedance element 242 coupled to the second ground structure 241. It should be noted that the features of the first grounding structure 141, the first impedance element 142, the second grounding structure 241 and the second impedance element 242 are similar to those of the foregoing embodiments, and are not repeated herein.

Next, referring to fig. 10, fig. 10 is a schematic top view of an antenna structure according to another embodiment of the second embodiment of the present invention. As can be seen from a comparison between fig. 10 and fig. 8, in the embodiment of fig. 10, the first antenna 1 may further include a first parasitic element 16, the first parasitic element 16 may be disposed on the substrate S, the first parasitic element 16 may be coupled to the ground element 3, the first parasitic element 16 may have a first parasitic portion 161 coupled to the ground element 3 and a second parasitic portion 162 bent from the first parasitic portion 161 and extending in a direction away from the first feeding portion 13, and the second parasitic portion 162 may be adjacent to the first radiating portion 11. In addition, the second antenna 2 may further include a second parasitic element 26, the second parasitic element 26 may be disposed on the substrate S, the second parasitic element 26 may be coupled to the ground element 3, the second parasitic element 26 may have a third parasitic portion 261 coupled to the ground element 3 and a fourth parasitic portion 262 bent from the third parasitic portion 261 and extending in a direction away from the second feeding portion 23, and the fourth parasitic portion 262 may be adjacent to the third radiating portion 21. It should be noted that the features of the first parasitic element 16 and the second parasitic element 26 are similar to those of the foregoing embodiments, and are not repeated herein.

[ advantageous effects of the embodiments ]

One of the benefits of the present invention is that the antenna structure provided in the embodiment of the present invention can reduce mutual current interference between the first antenna and the second antenna by using the technical scheme that the grounding element is coupled to the first grounding portion of the first antenna and the second grounding portion of the second antenna, so as to improve the isolation between the first antenna and the second antenna.

Furthermore, the antenna structure U according to the embodiment of the present invention can reduce mutual current interference between the first antenna 1 and the second antenna 2 by using the technical solutions that the first current path P1, the second current path P2 and the first ground current path L1 do not overlap with each other and the third current path P3, the fourth current path P4 and the second ground current path L2 do not overlap with each other, so as to improve the isolation between the first antenna 1 and the second antenna 2.

Furthermore, the antenna structure U provided in the embodiment of the present invention can also utilize the technical solution that "a first gap W1 is formed between the second radiation portion 12 and the first ground portion 14, and a second gap W2 is formed between the fourth radiation portion 22 and the second ground portion 24", so as to improve the isolation between the first antenna 1 and the second antenna 2.

Furthermore, the antenna structure U provided in the embodiment of the present invention can also form a common ground by directly connecting the first ground 14 of the first antenna 1 to the second ground 24 of the second antenna 2, so that the first antenna 1 and the second antenna 2 have a common ground structure.

The disclosure above is only a preferred embodiment of the present invention, and is not intended to limit the claims, so that all technical equivalents that can be made by using the disclosure of the present invention and the accompanying drawings are included in the claims.