阅读说明：本技术 天线装置以及电子设备 (Antenna device and electronic apparatus ) 是由 西冈善夫 于 2019-05-21 设计创作，主要内容包括：本发明提供了能够以简易的结构减少SAR的天线装置以及电子设备。该天线装置包括：待供电的天线元件(21)、以及与天线元件(21)相互的长边方向彼此大致平行地配置并能与天线元件(21)谐振的至少一个谐振天线元件(22)。(The invention provides an antenna device and an electronic apparatus capable of reducing SAR with a simple structure. The antenna device includes: an antenna element (21) to be fed with power, and at least one resonant antenna element (22) which is disposed substantially parallel to each other in the longitudinal direction of the antenna element (21) and can resonate with the antenna element (21).)

1. An antenna device, comprising:

an antenna element to which power is supplied; and

at least one resonant antenna element, which is disposed substantially parallel to the antenna element in the longitudinal direction thereof and is capable of resonating with the antenna element.

2. The antenna device of claim 1,

the resonant antenna element is a structure that is not powered.

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

said antenna device comprising at least 2 of said resonant antenna elements,

at least 2 of the resonant antenna elements are arranged to space the antenna elements in a direction perpendicular to the long side direction of the antenna elements.

4. The antenna device according to claim 3,

the resonant antenna element is arranged with its center offset from the center of the antenna element in the longitudinal direction.

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

the resonant antenna element is disposed symmetrically with respect to an axis of the antenna element in the longitudinal direction.

6. The antenna device according to any of claims 1 to 5,

the antenna element is a monopole antenna element.

7. An electronic device, characterized in that,

comprising an antenna arrangement as claimed in any of claims 1 to 6.

Technical Field

The present invention relates to an antenna device and an electronic apparatus capable of reducing SAR (Specific Absorption Rate) with a simple configuration.

Background

In consideration of the spread of wireless communication devices used in a state close to the human body, such as mobile phones and information processing devices, there is a standard for defining the allowable amount of SAR, which is an index of the amount of electric power of radio waves absorbed by the human body, in a plurality of countries. SAR refers to the energy absorbed by human tissue of unit mass per unit time, and the higher the frequency, the greater the effect on the human body (absorption rate).

In portable information apparatuses such as notebook personal computers (notebook PCs) and tablet personal computers (tablet PCs), there are cases where requirements regarding SAR are strict. For example, when a notebook PC or a tablet PC is used while being placed on a user's knee, the case of the PC on which the antenna device is mounted may come into contact with or come close to the user's knee, abdomen, or the like.

In this case, considering the influence of SAR on the human body, the transmission power of the antenna device is reduced, or when the transmission of the antenna device is stopped when the human body is detected, the performance of communication is affected. In addition, if the housing structure of the electronic device is changed so as to take the distance between the antenna device and the human body, the size of the housing has to be increased.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide an antenna device and an electronic apparatus that can reduce SAR with a simple configuration.

In order to solve the above problems and achieve the object, an antenna device according to a first aspect of the present invention includes: an antenna element to which power is supplied; and at least one resonant antenna element which is disposed substantially parallel to the antenna element in the longitudinal direction thereof and is capable of resonating with the antenna element.

The resonant antenna element is not fed with power.

The antenna device according to the above aspect may further include at least 2 resonant antenna elements, and at least 2 resonant antenna elements may be arranged with the antenna elements spaced apart from each other in a direction perpendicular to the longitudinal direction of the antenna elements.

The resonant antenna element may be arranged with its center offset from the center of the antenna element in the longitudinal direction.

The resonant antenna element may be disposed symmetrically with respect to the longitudinal axis of the antenna element.

The antenna element may be a monopole antenna element.

An electronic device according to a second aspect of the present invention includes the antenna device according to the first aspect.

According to the above aspect of the present invention, it is possible to provide an antenna device and an electronic apparatus capable of reducing SAR with a simple configuration.

Drawings

Fig. 1 is a perspective view of an electronic device 10 including an antenna device according to an embodiment of the present invention.

Fig. 2 (a) and (b) are explanatory views showing the concept of the antenna device.

Fig. 3 is a diagram showing a specific configuration of the antenna device.

Fig. 4 is a diagram showing a configuration of an antenna device in which a resonant antenna element is further added to the antenna device shown in fig. 3.

Description of the reference numerals

10 … an electronic device; 12 … hinge assembly; 14 … display housing; 14a … lower end; 16 … a main body housing; 16a … rear end; 18 … display device; 18a … display surface; 19 … outer race member; 20. 20a, 40 … antenna arrangement; 21 … an antenna element; 22 … resonant antenna element; 24 … a cover member; 26 … keyboard means; 27 … touch pad; 30 … ground line; 31 … printed circuit substrate; l1, L2 … length; w … width.

Detailed Description

Hereinafter, preferred embodiments of the antenna device according to the present invention will be described in detail with reference to the accompanying drawings.

< overview of electronic apparatus >

Fig. 1 is a perspective view of an electronic device 10 including an antenna apparatus 20 according to an embodiment of the present invention. Fig. 1 shows a state in which the display housing 14 is opened from the main body housing 16 by the hinge device 12, and the electronic apparatus 10 is set to a use mode of a notebook PC.

The electronic device 10 is a so-called convertible (convertible) PC configured to be able to open and close the display housing 14 from a 0-degree position closed with respect to the main body housing 16 to a 360-degree position after being turned over. Therefore, the electronic apparatus 10 can be suitably used as a notebook PC in a state where the display housing 14 is rotated to an angular position of 90 degrees to the front and rear with respect to the main body housing 16 (see fig. 1), and can be suitably used as a tablet PC in a state where the display housing 14 is rotated to a 360 degree position with respect to the main body housing 16 and is turned upside down. In addition to such a convertible PC, the present embodiment can be used in various electronic apparatuses such as a general notebook PC in which a display housing can be rotated only to a position of 180 degrees, a tablet PC in which a display device is provided in one housing, a cellular phone, a smart phone, and an electronic organizer.

Hereinafter, as shown in fig. 1, the hinge device 12 side of the display housing 14 will be referred to as the lower side (lower end) and the opposite side as the upper side (upper end) with reference to a state in which the display housing 14 is opened to about 90 degrees from the main body housing 16 to be used as a notebook PC. The hinge device 12 side of the main body case 16 is referred to as a rear side (rear end), the opposite side is referred to as a front side (front end), and the width directions of the display case 14 and the main body case 16 are referred to as a left side and a right side, respectively.

As shown in fig. 1, the electronic apparatus 10 is configured by rotatably coupling a lower end portion 14a of the display housing 14 and a rear end portion 16a of the main body housing 16 by a pair of right and left hinge devices 12.

The display housing 14 is provided with a display device 18 on its inner face. The display housing 14 is formed as a flat-plate-shaped box body thinner than the main body housing 16 by overlapping and coupling the outer ring member 19 and the cover member 24.

The display device 18 is constituted by, for example, a touch panel type liquid crystal display device. The display device 18 is covered with a metal or conductive film except for the display surface 18 a.

The outer ring (bezel) member 19 is a frame-shaped member made of resin. The outer ring member 19 surrounds and holds the peripheral portion of the display device 18. The lid member 24 is a structure in which a wall portion rising from the outer ring member 19 side is provided at a peripheral portion of a resin plate-like member. The cover member 24 is for covering the side and the back of the display housing 14. The display housing 14 is coupled to the main body housing 16 via the hinge device 12 fixed to the cover member 24 by screw connection. The display housing 14 is electrically connected to the main body housing 16 via a cable, not shown, passing through the hinge device 12.

The main body casing 16 is a flat-plate-shaped box, and a keyboard device 26 and a touch panel 27 are provided on the inner surface thereof. The main body case 16 houses various electronic components such as a substrate, a computing device, and a memory, which are not shown. The keyboard device 26 may be, for example, a software keyboard or the like that displays a virtual keyboard on a touch panel type liquid crystal display device.

A pair of left and right antenna devices 20 are provided in front of the right end and front of the left end of the main body case 16, respectively. A pair of left and right antenna devices 20 are also provided at the rear end of the main body case 16. The antenna device 20 is an antenna for various wireless communications such as a wireless LAN (local area network) and a wireless WAN (wide area network) of the electronic apparatus 10. As shown in fig. 1, the antenna device 20 is provided on, for example, an outer ring member 19 at the upper end of the display housing 14. Here, the antenna device 20 is disposed at a position where it is likely to touch a human body such as a hand during use of the electronic apparatus 10.

< concept of antenna device >

Next, a concept of the antenna device 20 will be explained. Fig. 2 is an explanatory diagram illustrating a concept of the antenna device 20. In fig. 2, a monopole antenna is described as an example of the antenna device 20. As shown in fig. 2 (a), in the conventional antenna device 20a, the antenna element 21 is provided on the ground 30, and electromagnetic waves are transmitted and received by supplying and receiving power to and from the antenna element 21. In the case of transmission from the antenna element 21, an electromagnetic wave is transmitted from the antenna element 21. In this case, a large radiated power is generated in the vicinity of the antenna element 21.

In contrast, in the antenna device 20 of the present embodiment, as shown in fig. 2 (b), the resonance antenna elements 22 that are not fed are arranged in parallel along the direction (X direction) perpendicular to the longitudinal direction (Z direction) of the antenna element 21 so as to be spaced apart from the antenna element 21. The resonance antenna element 22 is coupled and resonated with the resonance space of the antenna element 21, thereby transmitting an electromagnetic wave. As a result, the radiated power from the antenna element 21 is distributed to the resonant antenna element 22, and the electromagnetic wave that spatially propagates is transmitted from the entire antenna element 21 and the resonant antenna element 22. This can suppress the electromagnetic field radiated from the antenna element 21 and reduce the local SAR to a predetermined value or less without reducing the transmission power.

Although there is a difference in the amount of coupling loss between the antenna element 21 and the resonant antenna element 22 in the remote electromagnetic field strength of the antenna device 20 and the antenna device 20a, the difference is almost the same and does not cause a large difference in antenna performance.

< example of antenna device 20 >

Fig. 3 is a diagram showing a specific configuration of the antenna device 20. As shown in fig. 3, the antenna device 20 is configured such that the ground 30 and the antenna element 21 are printed on the front surface (+ Y-direction surface) of the printed circuit board 31, and the non-feeding resonant antenna element 22 arranged in parallel with the antenna element 21 is printed on the rear surface (-Y-direction surface) of the printed circuit board 31.

In fig. 3, 2 resonant antenna elements 22 are formed, and each resonant antenna element 22 is arranged symmetrically with respect to an axis in the longitudinal direction (Z direction) of the antenna element 21. The length L2 of each resonant antenna element 22 is almost the same as the length L1 of the antenna element 21, but since each resonant antenna element 22 is a non-feeding element, the length L2 of each resonant antenna element 22 is a length different from the length L1 of the antenna element 21 in consideration of resonance conditions.

Further, the width W between the resonant antenna element 22 and the antenna element 21 is set according to the resonance condition.

Further, each resonant antenna element 22 is disposed with the center in the longitudinal direction (Z direction) shifted in the longitudinal direction (Z direction) from the center in the longitudinal direction (Z direction) of the antenna element 21, and the transmission power of the antenna element 21 is also dispersed and concentrated in the Z direction. Each resonant antenna element 22 shown in fig. 3 is arranged offset in the-Z direction with respect to the antenna element 21.

Fig. 4 is a diagram showing a configuration of an antenna device 40 in which the resonant antenna element 22 is further added to the antenna device 20 shown in fig. 3. As shown in fig. 4, the antenna device 40 further includes the resonant antenna element 22 on the outer side (± X direction) of the resonant antenna element 22 on the back surface of the printed circuit board 31. The added resonance antenna 22 is disposed with the center in the longitudinal direction (Z direction) shifted further in the longitudinal direction (-Z direction) from the center in the longitudinal direction (Z direction) of the antenna element 21. The antenna device 40 can disperse the concentration of the transmission power of the antenna element 21 more than the antenna device 20.

Each resonant antenna element 22 may be resonant, and may have a length of an integral multiple thereof. At least one resonant antenna element 22 may be provided. Since the concentration of the transmission power by the antenna element 21 can be dispersed even with the arrangement of one resonant antenna element 22. That is, the resonant antenna element 22 may not be arranged symmetrically with respect to the longitudinal direction (Z direction) of the antenna element 21. The resonant antenna element 22 may not be shifted in the longitudinal direction (Z direction) from the center of the antenna element 21 in the longitudinal direction (Z direction).

In the above-described embodiments, although the description has been given taking the monopole antenna as an example, the present invention is not limited to this, and the present invention can be applied to various antenna devices. In particular, the present invention is also useful for application to a wire antenna.

Note that each of the configurations shown in the above-described embodiments and modifications is a functionally schematic configuration, and does not necessarily need to be physically shown. That is, the form of distribution and integration of the respective devices and components is not limited to the illustrated configuration, and all or a part of them may be configured to be functionally or physically distributed and integrated in arbitrary units according to various usage situations and the like.