JP2003318639A - Antenna device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an antenna device which is easy to adjust impedance and has good sensitivity with respect to an antenna device used for a wireless device for mobile communication such as a mobile phone. SOLUTION: An open end in which an electric field is increased by forming a bent portion 22A near an open end 12A of a plate-shaped first antenna element 11 disposed on a conductive ground plane to form an antenna device 19 is provided. Since the facing distance between the first antenna element 11 and the conductive ground plane is different near the portion 12A, the capacitance can be largely changed, and the resonance frequency and its band and impedance can be easily corrected to bend. The antenna device 19 having the same shape other than the portion 22A and having a high sensitivity that can cope with various arrangements with the high-frequency circuit portion can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device mainly used in a mobile communication wireless device such as a mobile phone.

[0002]

2. Description of the Related Art In recent years, with the increasing demand for wireless devices for mobile communication such as mobile phones, there is also a demand for built-in antenna devices that are compatible with wireless devices of various designs. The so-called plate-shaped inverted F antenna device in which the horizontal portion with respect to the conductor ground plane is plate-shaped is generally widely used.

Regarding such a conventional antenna device,
This will be described with reference to FIG.

In the figure, the vertical dimension L1 × made of copper alloy plate
Below the antenna element 1 having a lateral dimension L2, a conductor base plate 2 made of a copper alloy plate is arranged in parallel with the antenna element 1 at a distance H, and although not shown, a case is formed of an insulating resin. However, in this case, the antenna element 1 has a space H.
And is fixed to the conductor ground plane 2.

Then, the first terminal 3 formed at one end of the antenna element 1 is electrically connected to the conductor ground plate 2 by a method such as soldering, and at a position at a distance L4 from the first terminal 3 of the antenna element 1. The second terminal 5 is formed at the feeding point 4, and the antenna device 7 is formed by penetrating the hole 6 in an insulated state from the conductor ground plate 2 and projecting below the conductor ground plate 2.

Further, the antenna device 7 is arranged in a radio device main body (not shown), and the conductor ground plane 2 of the antenna device 7 is electrically connected to a ground portion (not shown) formed in the radio device main body. The second terminal 5 of the antenna device 7 is electrically connected to a high-frequency circuit section (not shown) provided in the main body of the wireless device by pressure welding or the like.

In the above configuration, the antenna device 7 is
During reception, the received electromagnetic wave having a predetermined resonance frequency is converted into an electric signal, and this electric signal is input to the high frequency circuit section of the main body of the wireless device through the second terminal 5, and conversely during transmission, the predetermined resonance frequency from the high frequency circuit section is reversed. Is converted into an electromagnetic wave and radiated as an electromagnetic wave.

Further, the length of the first terminal 3 formed on the antenna element 1 of the antenna device 7, that is, the spacing H, has an inductive property as seen from the feeding point 4 of the antenna element 1 excluding the first terminal 3 portion. Capacitance is formed by the part of, and the resonance frequency as the antenna device 7 is determined by these.

The dimensions L1 and L2 of the antenna element 1
Becomes larger and the capacitance increases, or the distance H between the antenna element 1 and the conductor ground plate 2 increases and the inductive property increases, the resonance frequency becomes lower, and conversely the dimensions L1 and L2 of the antenna element 1 become smaller. As a result, if the capacitance is reduced, or if the distance H between the antenna element 1 and the conductor ground plane 2 is reduced and the inductive property is reduced, the resonance frequency increases.

Therefore, after L1, L2, and H are determined so that a predetermined resonance frequency is obtained, the impedance is approximated to the impedance of the high-frequency circuit section of the radio device main body which can transmit / receive with the highest sensitivity corresponding to this resonance frequency. The antenna device 7 is configured by determining the impedance of the antenna by setting the position of the feeding point 4, that is, L4.

[0011]

However, in the above-described conventional antenna device 7, when the antenna device 7 is attached to the radio device main body, the antenna device 7 and the high frequency circuit part may be disposed relative to each other depending on the arrangement of the high frequency circuit part. Due to the influence of the change in electromagnetic field distribution due to the difference in position, the impedance changes from the specified value, the resonance frequency and its band change, and the desired sensitivity cannot be obtained. Therefore, there is a problem that antennas having different shapes such as L1, L2, H are required each time.

The present invention is intended to solve such a conventional problem, and an object thereof is to provide an antenna device in which impedance adjustment is easy and sensitivity is good.

[0013]

In order to achieve the above object, the present invention has the following constitution.

According to a first aspect of the present invention, at least one of a plate-shaped first antenna element disposed on the conductor ground plate, near the open end or the outer peripheral end, or a conductor ground plate facing these ends. The antenna device is configured by forming a bent portion in one of the two, and making the facing interval different from each other, and a facing surface between the first antenna element and the conductor ground plane near the open end where the electric field increases or the outer peripheral end. Since the intervals are different, it is possible to greatly change the capacitance, and the resonance frequency and its band and impedance can be easily corrected to adjust the resonance frequency, the open end portion or the outer peripheral end portion, or a portion other than the conductor ground plate opposite to these. The antenna device has the same shape, and has an effect that it is possible to obtain an antenna device having good sensitivity, which can correspond to various arrangements with the high-frequency circuit unit.

According to a second aspect of the present invention, in the first aspect of the invention, the first antenna element is formed by a plurality of radiation conductor portions having different electric lengths, and transmission / reception in a plurality of bands is possible. It has an effect that an antenna device can be provided.

According to a third aspect of the present invention, the plate-shaped first antenna element is provided on the conductor ground plane, and the plate-shaped second antenna element is provided near the first antenna element with a predetermined gap. A bent portion is formed in the vicinity of the open end of the first antenna element or the second antenna element or at the outer peripheral end, or in at least one of the conductor ground planes facing the open end, and the facing intervals are made different to form an antenna device. The resonance frequency and its band and impedance can be easily corrected, and the wireless device can transmit and receive by combining the resonance frequency band of the first antenna element and the resonance frequency band of the second antenna element. This has the effect of widening the band.

According to a fourth aspect of the invention, in the third aspect of the invention, at least one of the first antenna element and the second antenna element is formed by a plurality of radiation conductor portions having different electric lengths. This has the effect of providing an antenna device capable of transmitting and receiving in the band.

The invention according to claim 5 is the invention according to claim 1 or 3.
In the invention described, the conductor ground plate and each antenna element is fixed at a predetermined interval with an insulating case, and the dielectric constant of the insulating case is partially different,
Since the capacitance can be further changed, the impedance can be corrected in a wider range.

According to a sixth aspect of the invention, in the fifth aspect of the invention, at least one of the first antenna element and the second antenna element is in the vicinity of the open end portion or the outer peripheral end portion, or at least one of the conductor ground planes facing the open end portion. A hole is provided in a nearby insulating case, and the impedance is determined during transport or mounting after fixing the impedance by fixing at least one deformation degree near the open end or the outer peripheral end, or the conductor ground plate facing these. Even if the error occurs, the hole can be utilized to provide an antenna device capable of correcting the error.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

(First Embodiment) Using the first embodiment,
The invention of claims 1 and 2 will be described.

FIG. 1 is a perspective view of an essential part of an antenna device according to a first embodiment of the present invention. In FIG. 1, reference numeral 17 denotes a conductor ground plane, which is a conductive metal such as copper, copper alloy, aluminum alloy, and stainless alloy. Alternatively, they are formed of a thin plate-shaped conductor which is plated with a conductive metal such as Au or Ni.

A terminal (not shown) electrically connected to the ground side of the high frequency circuit portion of the radio device main body (not shown) is provided at a predetermined position of the conductor ground plate 17.

Reference numeral 11 denotes a first antenna element, which is arranged on the conductor ground plate 17 so as to be substantially parallel to each other with a predetermined space therebetween. Like the conductor ground plate 17, a conductive metal or a conductive metal plating is applied to the conductive metal. It is formed from a thin plate-shaped conductor that has been subjected to.

The first terminal 1 electrically connected to the conductor ground plane 17 is provided at one end of the lower left portion of the first antenna element 11.
3 is formed vertically downward.

A second terminal 16 electrically connected to the signal input / output side of the high-frequency circuit section of the radio apparatus main body is formed vertically downward at a distance L15 from the first terminal 13.

The first antenna element 11 is provided with a first radiating conductor portion 12 having an electric length L12 and a second radiating conductor portion 14 having an electric length L14 different from the electric length L12 on the same plane.

A bent portion 22A which is bent and deformed in the direction of the conductor ground plate 17 by a press or the like is provided near the open end 12A of the first radiation conductor portion 12.

The first antenna element 11 and the conductor ground plane 17 are formed by bending the bent portion 22A of the first radiating conductor portion 12.
The antenna device 19 is configured by fixing a constant space H11 at a portion other than the space H12 between the conductor ground plate 17 and the conductor ground plate 17 and fixing them with an insulating case (not shown) made of ABS resin.

Next, the antenna device 1 having the above configuration
The setting of each dimension 9 will be described.

First, a band of a predetermined resonance frequency, for example, 8
The first so that the resonance frequency can be obtained at 90 to 925 MHz.
Electric length L12 of the first radiation conductor portion 12 of the antenna element 11
And the distance H1 between the first antenna element 11 and the conductor ground plane 17.
Set 1.

Further, the electric length L14 of the second radiating conductor portion 14 of the first antenna element 11 and the first antenna element so that the resonance frequency can be obtained in a band of a predetermined resonance frequency different from the above, for example, 1710 to 1880 MHz. The distance H11 between the conductor 11 and the conductor ground plane 17 is set.

Therefore, the electrical length L of the first antenna element 11
The band 89 of the resonance frequency by the first radiating conductor portion 12
The wireless device is provided with two transmittable / receivable bands of 0 to 925 MHz and a resonance frequency band 1710 to 1880 MHz of the second radiation conductor portion 14 having an electric length L14 different from the electric length L12.

Then, the position of the second terminal 16, that is, L15 is set so as to approach the impedance of the high-frequency circuit section of the radio device body capable of transmitting and receiving with the highest sensitivity corresponding to these resonance frequencies, usually about 50Ω. By doing so, the impedance of the antenna is determined.

However, when the antenna device 19 is attached to the main body of the radio device, it may be affected by the change in the electromagnetic field distribution due to the difference in the relative position between the antenna device 19 and the high frequency circuit part, depending on the arrangement with the high frequency circuit part. The impedance may change from a predetermined value, the resonance frequency and its band may change, and the desired sensitivity may not be obtained.

Therefore, after the placement of the high frequency circuit section is determined, the antenna device 19 is installed in a predetermined position of the radio apparatus main body, and if the impedance changes from the predetermined value, this impedance is changed to the first radiating conductor section. The gap H12 between the bent portion 22A near the open end portion 12A of 12 and the conductor ground plane 17 is corrected to obtain the impedance with which transmission and reception can be performed with the highest sensitivity.

In terms of electromagnetic field, the electric field strength of the electromagnetic wave is large in the vicinity of the open end 12A and the outer peripheral end 12B separated from the second terminal 16. Therefore, the bent portion 22A provided near the open end 12A and the conductor By changing the distance H12 from the ground plane 17, it is possible to greatly change the capacitance and efficiently adjust the impedance.

In the above configuration, the antenna device 19
Converts a received electromagnetic wave having a predetermined resonance frequency into an electric signal at the time of reception, inputs the electric signal to the high frequency circuit section of the wireless device body through the second terminal 16, and conversely at the time of transmission, a predetermined frequency from the high frequency circuit section. It is configured to convert an electric signal having a resonance frequency into an electromagnetic wave and radiate the electromagnetic wave.

As described above, according to the present embodiment, the bent portion 22A is formed in the vicinity of the open end 12A of the plate-shaped first antenna element 11 arranged on the conductor ground plane to form the antenna device 19. By doing so, since the facing interval between the first antenna element 11 and the conductor ground plate is made different near the open end 12A where the electric field becomes large, it is possible to greatly change the capacitance, and the resonance frequency and its band and It is possible to easily correct the impedance and obtain the antenna device 19 having the same shape except for the bent portion 22A and capable of coping with various arrangements with the high frequency circuit portion and having good sensitivity.

The first antenna element 11 has an electrical length L1.
An antenna that can perform transmission / reception within the resonance frequency band of two different radio devices by forming the first radiation conductor part 12 of 2 and the second radiation conductor part 14 of electric length L14 different from this electric length L12. The device 19 can be obtained.

Further, a conductor ground plane is formed on a wiring board or the like on which the high frequency circuit section of the radio device main body is formed, and the first
If the antenna element 11 is connected, the number of components of the antenna device as a whole can be reduced, and the size of the wireless device main body can be reduced.

In the above description, the impedance of the antenna is described as being corrected by providing the bent portion 22A near the open end 12A of the first radiation conductor portion 12, but the outer circumference of the first radiation conductor portion 12 is described. End 12B and conductor ground plane 1
The present invention can be implemented even if the impedance is corrected by providing a bent portion between 7 and a bent portion between the conductor ground plate 17 and both the vicinity of the open end 12A and the outer peripheral end 12B. .

Alternatively, instead of the first radiation conductor portion 12, the second radiation conductor portion 12
Near the open end 14A of the radiating conductor 14 and the outer peripheral end 14B
The impedance may be corrected by providing a bent portion between the conductor and the ground plane 17, or by providing a bent portion in both the first radiation conductor portion 12 and the second radiation conductor portion 14.

Then, the first antenna element 11 and the conductor ground plane 17 are made of a conductive metal such as copper or a copper alloy, or Au or N.
Although it has been described as being formed of a thin plate-shaped conductor plated with a conductive metal such as i, the first antenna element 11 and the conductor base plate 17 are formed on the surface made of resin by plating, printing, or the like, copper, copper alloy, or the like. Alternatively, a film having a conductive metal formed thereon or a film having a conductive metal such as copper or copper alloy formed thereon may be attached to the resin.

(Second Embodiment) Using the second embodiment,
The invention of claims 3 and 4 to 6 will be described.

The same components as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 2 is a perspective view of an essential part of an antenna device according to a second embodiment of the present invention. In FIG. 2, reference numeral 17 denotes a conductor ground plane, which is a conductive metal or a thin plate obtained by plating the conductive metal with the conductive metal. It is formed from a conductor.

11 is the first antenna element,
They are arranged on the conductor ground plate 17 so as to be substantially parallel to each other with a predetermined space therebetween, and are made of a conductive metal or a thin plate conductor plated with a conductive metal.

Then, the first terminal 1 electrically connected to the conductor ground plate 17 is provided at one end of the lower left portion of the first antenna element 11.
The second terminal 1 is formed vertically downward and is electrically connected to a high-frequency circuit section (not shown) of the wireless device body (not shown) at a position at a distance L15 from the first terminal 13.
6 is formed vertically downward.

The first antenna element 11 has a first radiating conductor portion 12 having an electric length L12 and a second radiating conductor portion 14 having an electric length L14 different from the electric length L12 formed on the same plane.

Reference numeral 18 denotes a second antenna element, which is disposed between the first antenna element 11 and the conductor ground plate 17 at a predetermined interval so as to be substantially parallel to each other without being directly connected thereto. Similar to the antenna element 11 and the conductor ground plane 17, it is formed of a conductive metal or a thin plate conductor having a conductive metal plated thereon.

The second antenna element 18 is formed from a single radiating conductor portion having an electric length L13, and the second antenna element 18 is formed in the vicinity of the open end portion 18A of the second antenna element 18 toward the conductor ground plate 17 by pressing or the like. A bent portion 28A that is bent and deformed is provided.

Then, these first antenna elements 11,
The conductor ground plane 17 and the second antenna element 18 respectively include a distance H11 between the first antenna element 11 and the conductor ground plane 17, a distance H13 between the second antenna element 18 and the conductor ground plane 17, and a bent portion 28A of the second antenna element 18. The antenna device 29 is configured by leaving a space H14 between the conductor ground plate 17 and the conductor ground plate 17 and fixing the same with an insulating case (not shown) made of ABS resin.

Next, the antenna device 2 having the above configuration
The setting of each dimension 9 will be described.

First, a band of a predetermined resonance frequency, for example, 8
The first so that the resonance frequency can be obtained at 90 to 925 MHz.
Electric length L12 of the first radiation conductor portion 12 of the antenna element 11
And the distance H1 between the first antenna element 11 and the conductor ground plane 17.
Set 1.

Next, the high frequency side of the band of the predetermined resonance frequency,
For example, the electric length L13 of the radiating conductor portion of the second antenna element 18 is set so that a resonance frequency of 925 to 960 MHz can be obtained.
And the distance H1 between the second antenna element 18 and the conductor ground plane 17.
Set 3.

That is, the resonance frequency bands 890 to 925 MHz of the first antenna element 11 and the resonance frequency bands 925 to 960 MHz of the second antenna element 18 are combined to give a predetermined resonance frequency band 890 to 960 MHz.
As a result, the bandwidth that can be transmitted and received by the wireless device is widened.

Further, the electric length L14 of the second radiating conductor portion 14 of the first antenna element 11 and the first antenna element so that the resonance frequency is obtained in a band of a predetermined resonance frequency different from the above, for example, 1710 to 1880 MHz. The distance H11 between the conductor 11 and the conductor ground plane 17 is set.

Therefore, the electrical length L of the first antenna element 11 is
The band 89 of the resonance frequency by the first radiating conductor portion 12
0 to 925 MHz and the electrical length L of the second antenna element 18
Resonant frequency bands 925 to 96 by 13 radiating conductors
Resonant frequency band 890-960 that is combined with 0 MHz
The wireless device is provided with two transmittable and receivable bands of MHz and a resonance frequency band 1710 to 1880 MHz of the second radiation conductor portion 14 having the electrical length L14.

Then, the impedance of the antenna is determined by setting L15 so as to approach the impedance of the high-frequency circuit section of the radio apparatus main body capable of transmitting and receiving with the highest sensitivity corresponding to these resonance frequencies, usually about 50Ω. is doing.

However, when the antenna device 29 is attached to the main body of the radio device, it may be affected by the change in the electromagnetic field distribution due to the difference in the relative position between the antenna device 29 and the high frequency circuit part depending on the arrangement with the high frequency circuit part. The impedance may change from a predetermined value, the resonance frequency and its band may change, and the desired sensitivity may not be obtained.

Therefore, after the placement of the high-frequency circuit section is determined, the antenna device 29 is installed in a predetermined position of the radio device main body, and if the impedance changes from the predetermined value, this impedance is used as the second antenna element 18. The impedance is adjusted by changing the distance H14 between the bent portion 28A near the open end portion 18A and the conductor ground plane 17 so that the impedance with which transmission and reception can be performed with the highest sensitivity is obtained.

In the above configuration, the antenna device 29
Converts a received electromagnetic wave having a predetermined resonance frequency into an electric signal at the time of reception, inputs the electric signal to the high frequency circuit section of the wireless device body through the second terminal 16, and conversely at the time of transmission, a predetermined frequency from the high frequency circuit section. It is configured to convert an electric signal having a resonance frequency into an electromagnetic wave and radiate the electromagnetic wave.

As described above, according to the present embodiment, the plate-shaped first antenna element 11 is provided on the conductor ground plate 17, and the plate-shaped second antenna element 11 is provided near the first antenna element 11 with a predetermined gap. By providing the antenna element 18 and forming the bent portion 28A in the vicinity of the open end portion 18A of the second antenna element 18, the shape other than the bent portion 28A is the same, and various arrangements with the high frequency circuit portion are possible. In addition, it is possible to obtain the antenna device in which the band of the resonance frequency of the first antenna element 11 and the band of the resonance frequency of the second antenna element 18 are combined to widen the transmittable / receivable band of the wireless device.

By forming at least one of the first antenna element 11 and the second antenna element 18 by a plurality of radiating conductor portions having different electrical lengths, an antenna device capable of transmitting and receiving in a plurality of bands can be obtained. it can.

In the above description, the impedance of the antenna is corrected by providing the bent portion 28A between the open end portion 18A of the second antenna element 18 and the conductor ground plate 17, but the second antenna element is corrected. A bent portion is provided between the outer peripheral end portion 18B of 18 and the conductor ground plate 17, or both the vicinity of the open end portion 18A and the outer peripheral end portion 18B and the conductor ground plate 17 are provided.
The present invention can be implemented even if the impedance is corrected by providing a bent portion therebetween.

Alternatively, in the vicinity of the open end 12A of the first radiating conductor 12 of the first antenna element 11 or the outer peripheral end 12B, or in the vicinity of the open end 14A of the second radiating conductor 14 or the outer peripheral end 14B and the conductor ground plane. The impedance may be corrected by providing a bent portion between 17 or between the first antenna element 11 and the second antenna element 18 and between the second antenna element 18 and the conductor ground plate 17.

Further, the bent portion 28A may be provided not only between the second antenna element 18 and the conductor ground plane 17, but also between the second antenna element 18 and the first antenna element 11 or both.

By providing the second radiating conductor portion 14 having a different predetermined resonance frequency on the first antenna element 11,
Although it has been described that the predetermined sensitivity is obtained in the resonance frequency bands of two different wireless devices, the first antenna element 1
Instead of providing the second radiating conductor portion 14 in 1, the radiating conductor portion is provided in the second antenna element 18 so that an antenna device capable of transmitting and receiving in the resonance frequency bands of two different radio devices can be obtained. good.

Although the second antenna element 18 is arranged between the first antenna element 11 and the conductor ground plane 17, the second antenna element 18 may be arranged on the first antenna element 11. Alternatively, it may be arranged beside the first antenna element 11.

Then, the first antenna element 1 is provided in the insulating case.
The first antenna element 11, the second antenna element 18, and the conductor ground plane 17 are fixed with a predetermined gap therebetween, and the dielectric constants of the insulating cases are partially different, for example, the first antenna element 11
When the air between the second antenna element 18 and the second antenna element 18 is 1.0, an ABS resin having a dielectric constant of 2.5 is used as the conductor ground plane 17
Between the second antenna element 18 and the second antenna element 18 is ABS resin having a dielectric constant of 2.7 different from the dielectric constant of 2.5, or the conductor ground plate 17 is used.
By providing a space between the second antenna element 18 and the second antenna element 18, the capacitance can be changed more greatly, so that the impedance can be corrected in a wider range.

The open end portion 1 of the second antenna element 18
By forming a hole in the lower insulating case near 8A,
Even if an impedance error occurs during transportation or mounting after fixing the degree of deformation near the open end and determining the impedance, it is possible to obtain an antenna device that can correct the error by using this hole. .

[0073]

As described above, according to the present invention, the advantageous effect that the impedance can be easily adjusted and the antenna device having good sensitivity can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of essential parts of an antenna device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a conventional antenna device.

[Explanation of symbols]

11 First antenna element 12 First radiation conductor 12A, 14A, 18A Open end 12B, 14B, 18B outer peripheral end 13 1st terminal 14 Second radiation conductor part 16 Second terminal 17 conductor ground plane 18 Second antenna element 19,29 Antenna device 22A, 28A Bent section

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01Q 9/42 H01Q 9/42 (72) Inventor Atsushi Yamamoto 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. In-house (72) Inventor Akio Miyajima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference)

Claims (6)

[Claims] 1. A conductor ground plane, a plate-shaped first antenna element disposed on the conductor ground plane, a first terminal electrically connecting the first antenna element and the conductor ground plane, and the first terminal. The second terminal is disposed at a predetermined distance from the terminal and is electrically connected to the high frequency circuit section of the wireless device body, and is near the open end of the first antenna element or the outer peripheral end, or is opposed to these. An antenna device in which at least one of the conductor ground planes is deformed. 2. The antenna device according to claim 1, wherein the first antenna element is formed by a plurality of radiation conductor portions having different electric lengths. 3. A conductor ground plane, a plate-shaped first antenna element disposed on the conductor ground plane, a first terminal for electrically connecting the first antenna element and the conductor ground plane, and the first terminal. A plate-like member provided with a predetermined gap in the vicinity of the second terminal, which is arranged at a predetermined distance from the terminal and is electrically connected to the high-frequency circuit section of the wireless device body, and the first antenna element. An antenna device comprising a second antenna element, wherein at least one of the first antenna element and the second antenna element is deformed in the vicinity of the open end or at the outer peripheral end, or at the location of the conductor ground plate facing the open end. 4. The antenna device according to claim 3, wherein at least one of the first antenna element and the second antenna element is formed by a plurality of radiation conductor portions having different electric lengths. 5. A case is formed of an insulating resin, and a conductor ground plate and each antenna element are fixed to the case with a predetermined gap therebetween, and the permittivity of the case is partially different. The antenna device described. 6. The antenna device according to claim 5, wherein a hole is provided in the case near the open end or the outer peripheral end of the antenna element, or in the case near at least one of the conductor ground planes facing the end.