JP2002330023A - Antenna device and wireless device using the same - Google Patents

Abstract

(57) [PROBLEMS] To provide a small and thin antenna device which realizes a wide band and high sensitivity without a matching circuit and which can easily set an impedance characteristic, and a radio having high communication quality using the antenna device. It is intended to provide a device. SOLUTION: A first radiating conductor element 11, a second radiating conductor element 12, a first antenna element formed from a short-circuit terminal 13 and a feed terminal 16, a conductor ground plate 17, and these are not directly connected to each other at a predetermined interval. By configuring the antenna device 19 with the arranged second antenna element,
A compact, thin, high-sensitivity wireless device can be provided by using the antenna device 19, which can achieve a multi-band, a wide band, and a high sensitivity. Can be.

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 for a radio device for mobile communication and the like and a radio device using the same.

[0002]

2. Description of the Related Art In recent years, with the growing demand for wireless devices for mobile communication, a high-performance, compact and lightweight wireless device capable of coping with diversifying communication modes with one wireless device has been desired. There is also a demand for an antenna device that can handle various wireless devices.

A typical example of such an antenna device and a mobile communication device using the same is a mobile phone, which is used in various regions of the world, and its operating frequency band differs depending on the region.

For example, in a digital cellular phone, the operating frequency band of a Japanese PDC (Personal Digital Cellular) 800 is 810 to 960 MHz, and the operating frequency band of a GSM (Group Special Mobile Community) in Europe and the United States is 890. ~ 960 MHz, PCN (Person
al Communication Network) is 1710-1880 MH
z, PCS (Personal Communication System) is 18
50 to 1990 MHz.

[0005] As a built-in antenna device used in such a cellular phone, a plate-shaped inverted-F antenna device is generally widely used.

An antenna device mounted on a conventional mobile phone will be described with reference to FIGS. 8 and 9. FIG.

FIG. 8 is a conceptual diagram of a conventional antenna device, and FIG.
FIG. 2 is a perspective view in which a part of the back surface of a mobile phone equipped with the antenna device is cut away.

First, in FIG. 8, a material having a thickness of 0.2 mm is provided below an antenna element 1 made of a copper alloy plate having a thickness of 0.2 mm and having a size of about 35 mm × 45 mm with a distance of 9 mm from the antenna element 1. A conductor ground plate 2 made of a 2 mm copper alloy plate is arranged in parallel, and although not shown in FIGS.
The antenna element 1 is fixed to the conductive ground plate 2 by a holding portion made of a resin dielectric material such as O. Then, the first terminal 3 formed at one end of the antenna element 1 is electrically connected to the conductive ground plate 2 by a method such as soldering, and the first terminal 3 of the antenna element 1
A second terminal 5 is formed at a feed point 4 near the terminal 3, and penetrates the hole 6 in a state of being insulated from the conductor ground plate 2 and protrudes below the conductor ground plate 2 to constitute an antenna device 7.

[0009] Then, as shown in FIG.
Is disposed in the rear case 9 of the mobile phone 8, and the conductor ground plate 2 of the antenna device 7 is electrically connected to a shield portion formed on the inner surface of the rear case 9 of the mobile phone 8 although not shown in FIG. 9. Then, the second terminal 5 of the antenna device 7 is electrically connected to a high-frequency circuit section (not shown) on a high-frequency circuit board provided inside the rear case 9 of the mobile phone 8 by a method such as pressure contact. Have been.

The operation of the antenna device 7 configured as described above and the portable telephone 8 using the same will be described below.

[0011] Antenna element 1, conductor ground plane 2, first terminal 3
The antenna device 7 constituted by the second terminal 5 and the second terminal 5 is generally called a plate-shaped inverted-F antenna.

The first terminal 3 formed on the antenna element 1 of the antenna device 7 is inductive, and the other parts of the antenna element 1 except for the first terminal 3 when viewed from the feed point 4 form a capacitive line. And the peripheral lengths L1, L of the antenna element 1
2. The width L3 of the first terminal 3 and the distance L4 between the first terminal 3 and the feeding point 4 are determined so as to give the antenna device 7 a desired resonance frequency and input impedance when viewed from the feeding point 4 of the antenna element 1. Is done. The input impedance is based on the position of the feed point 4, that is, L3 and L4, and can be matched to an impedance of approximately 50Ω at a desired resonance frequency of the high-frequency circuit.

When the mobile phone 8 is received, the signal power of the desired resonance frequency received by the antenna element 1 is distributed to the inside of the rear case 9 of the mobile phone 8 through the second terminal 5 formed on the antenna element 1. It is sent to the installed high frequency circuit. Next, at the time of transmission, the signal power of the desired resonance frequency output from the high-frequency circuit is radiated from the antenna element 1 via the second terminal 5.

A detailed technical description of such a general plate-shaped inverted-F antenna is described in "New Antenna Engineering" ISBN4-915.
449-80-7, pages 109-114, and numerous other technical articles and books.

The plate-shaped inverted-F antenna is suitable as an antenna device for a mobile phone requiring a small size, a high gain, a wide directional radiation pattern, and the like, and is relatively small and thin in a desired frequency band. It can be incorporated in the housing of a small device such as a telephone to give a degree of freedom to the design of the device.

Further, by incorporating the antenna device into the mobile phone, the antenna device is protected from mechanical shock by the housing of the mobile phone as compared with the exposed type, so that the antenna device is hardly damaged. Life can be extended.

[0017]

However, in the configuration of the conventional antenna device 7 as shown in FIG. 8, a bandwidth for obtaining a predetermined sensitivity in a frequency band used for a portable telephone as described above is a so-called bandwidth. The fractional band is as narrow as 3% at the maximum, and the shape is large in order to improve it, and it is smaller and thinner to respond to the recent market trend of smaller and thinner mobile phones and multiband. Broadband,
There was a problem that it was difficult to obtain a highly sensitive built-in type antenna device.

Further, such an antenna device 7 is shown in FIG.
In order to widen the frequency band and increase the sensitivity by using the mobile phone 8 as shown in FIG.
A complicated impedance matching circuit composed of an LC element is required between the terminal 5 and the high-frequency circuit section provided on the high-frequency circuit board of the mobile phone 8, which has increased the cost of the mobile phone.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is a built-in type antenna device which can contribute to a wide band, a high sensitivity, and a multi-band with a small space and a high productivity in which impedance adjustment is easy. Another object of the present invention is to provide an inexpensive wireless device with good call quality using the same.

[0020]

To achieve the above object, the present invention has the following arrangement.

According to a first aspect of the present invention, there is provided a conductive ground plate, a first terminal disposed on the conductive ground plate and electrically connected to the conductive ground plate, and a predetermined distance from the first terminal. A first antenna element having a second terminal and at least one radiating conductor element electrically connected to a high-frequency circuit unit of the radio device main body; and at least one plate not directly connected to the conductor ground plane and the first antenna element. A second antenna element having two radiating conductor elements, at least one radiating conductor element of the second antenna element is disposed between the conductor ground plane and the first antenna element to form an antenna body. , A first antenna element, a second antenna element, and an antenna device in which a conductive ground plane is fixed by a dielectric material. Since the antenna element is plate-shaped, the distance between the first terminal and the second terminal is determined. Radiation conductor element widths and lengths of the first antenna element and the second antenna element, dimensions such as the distance between the first antenna element and the second antenna element can be easily set, and the first antenna element, the second antenna element, and the conductor ground plane can be easily set. By utilizing the mutual electromagnetic field coupling, the impedance characteristics corresponding to the desired frequency band can be efficiently obtained and the bandwidth can be widened.
An effect is obtained that an antenna device having a simple structure that can be made highly sensitive and small in size can be obtained.

According to a second aspect of the present invention, in the first aspect of the present invention, a plate-like third antenna element having at least one radiating conductor element electrically connected to a high-frequency circuit section of the wireless device main body. Is provided as an antenna device, and by disposing a plate-shaped third antenna element,
By utilizing the mutual electromagnetic coupling between the first antenna element to the third antenna element and the conductor ground plane, it is possible to more easily obtain the impedance characteristic corresponding to the desired frequency band efficiently, thereby achieving a wider band and higher sensitivity. In addition, the antenna device has an effect of obtaining an antenna device having a simple structure that can be reduced in size.

According to a third aspect of the present invention, in the first aspect, at least one radiating conductor element of the first or second antenna element has an approximately zigzag shape or a substantially meander shape. Since the antenna element has a plate shape and a substantially zigzag shape or a substantially meander shape, the distance between the first terminal and the second terminal, the width and length of the radiation conductor elements of the first antenna element and the second antenna element, and the first
It is easier to set the distance between the antenna element and the second antenna element, and the impedance corresponding to the desired frequency band is obtained by utilizing mutual electromagnetic coupling between the first antenna element, the second antenna element, and the conductive ground plane. This has the effect of obtaining an antenna device with a simple structure that can efficiently obtain characteristics and achieve a wider band, higher sensitivity, and smaller size.

According to a fourth aspect of the present invention, there is provided the antenna device wherein the conductive ground plane is formed by the conductive ground plane or the ground of the radio apparatus main body, and the conductive ground plane is formed by the conductive ground plane or the ground of the radio apparatus main body. Therefore, the degree of freedom in the method of mounting the antenna device on the wireless device and the location thereof are increased, and the size of the wireless device main body can be reduced.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a matching circuit comprising at least one reactance element is provided on the second terminal of the first antenna element. The matching circuit makes it possible to easily perform high-precision impedance matching with the high-frequency circuit section of the wireless device body, efficiently obtain impedance characteristics corresponding to a desired frequency band, and further increase the bandwidth and sensitivity. Has an action.

According to a sixth aspect of the present invention, the conductor ground plate or the first terminal of the antenna device according to the first aspect is electrically connected to the conductor ground plate or the ground of the radio device main body, and
The wireless device is characterized in that the terminal is electrically connected to and mounted on a high-frequency circuit portion of the wireless device body,
A high-performance wireless device can be obtained and the housing of the wireless device can be obtained by mounting a small and thin antenna device that is easy to set impedance characteristics in a desired frequency band without a matching circuit, has high bandwidth, and has high sensitivity and high productivity. The body can protect the antenna device from mechanical shock, the design flexibility of the wireless device itself is high, and the need for a matching circuit for impedance matching is eliminated, so the cost of the wireless device can be reduced. Has an action.

According to a seventh aspect of the present invention, two antenna devices according to the first aspect are used to electrically connect the conductor ground plane or the first terminal to the conductor ground plane or the ground of the radio apparatus main body, and A second terminal electrically connected to and mounted on a high-frequency circuit unit of the wireless device main body, and formed to perform diversity communication, wherein a desired frequency band is provided without a matching circuit; By mounting two small and thin antenna devices with high productivity, wide band, high sensitivity and easy setting of impedance characteristics of the wireless device, the housing of the wireless device can protect the antenna device from mechanical shock and The degree of freedom in the design of the wireless device itself can be increased, and the cost of the wireless device can be reduced because a matching circuit for impedance matching is not required. Of course, such an action can be provided a radio device of good speech quality by functioning the larger of the antenna device of the received power by comparing the two antenna device in a weak electric field by constructing the diversity function.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) Using Embodiment 1,
The invention according to claim 1 will be described below.

FIG. 1 is a diagram showing the configuration of the antenna device according to the first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a first antenna element, which is a conductive metal such as copper, copper alloy, aluminum alloy or stainless steel, or a thin plate-shaped conductor obtained by plating the conductive metal with a conductive metal such as Au or Ni. And a first radiation conductor element 11 having a wavelength of about λ / 4 that resonates in the GSM band and a PC.
The second radiation conductor element 12 of about λ / 4 wavelength resonating in the N band
Are formed on the same plane, and the short-circuit terminal 13 and the first radiating conductor element 1 near the short-circuit terminal 13 are formed vertically below the common end of the first radiating conductor element 11 and the second radiating conductor element 12.
A power supply terminal 1 electrically connected to a high-frequency circuit unit 15 of a wireless device at a common power supply point 14 of the first and second radiation conductor elements 12
6 is provided.

Reference numeral 17 denotes a conductive ground plate, which is made of a conductive metal such as copper, a copper alloy, an aluminum alloy, or a stainless alloy, which is disposed below the first antenna element 10 so as to be substantially parallel with a predetermined distance therebetween. Alternatively, Au, Ni is used as the conductive metal.
And is electrically connected to the short-circuit terminal 13 of the first antenna element 10.

Reference numeral 18 denotes a second antenna element, which is disposed between the first antenna element 10 and the conductor ground plate 17 at a predetermined interval so as to be substantially parallel to each other without being directly connected to them. Similarly to the first antenna element 10 and the conductive ground plane 17, the second antenna element is formed by applying a conductive metal such as copper, copper alloy, aluminum alloy, and stainless steel alloy or a conductive metal plating such as Au or Ni to the conductive metal. It is formed of a thin plate conductor.

The first antenna element 10, the conductive ground plane 17 and the second antenna element 18 have the above-mentioned arrangement, and have a desired dielectric constant and a low dielectric loss resin dielectric material (not shown). ) Is fixed by insert molding or the like to form the antenna device 19.

Next, the operation of the antenna device 19 configured as described above will be described below.

The first radiation conductor element 11 shown in FIG.
A first antenna element 10 including a radiation conductor element 12, a short-circuit terminal 13, and a feed terminal 16, a conductor ground plane 17, and a second antenna element 18 disposed between the first antenna element 10 and the conductor ground plane 17. Antenna device 19
Is usually referred to as a plate-shaped inverted-F antenna, and is connected to a short-circuit terminal 13 and a feed terminal 16 formed on the first antenna element 10 so that a desired resonance frequency and impedance characteristics in the GSM band can be obtained. , The length L2 from the feed terminal 16 to the open end of the first radiating conductor element 11, the length L3 of the second antenna element 18, and the mutual distance between the first antenna element 10 and the conductor ground plane 17. Is determined.

The input impedance characteristics mainly include the position of the feeder terminal 16, ie, the relationship between the lengths of L1 and L2, the relationship between the lengths of L3 and L3 of the second antenna element 18, and the relationship between the first antenna element 10 and the second antenna element 18. It is based on the electromagnetic coupling relationship by the interval, and is almost equivalent to the high-frequency circuit 1 of a mobile phone.
5, the impedance can be matched to the desired resonance frequency of 50Ω.

The desired resonance frequency and impedance characteristics of the PCN band are determined by the length L1 between the short-circuit terminal 13 and the feed terminal 16 formed on the first antenna element 10 and the second radiating conductor element from the feed terminal 16. The input impedance characteristic is determined mainly by the position of the feeding terminal 16, that is, the length relationship between L1 and the length L4 of the second radiation conductor element 12.

At the time of reception, the signal power of the electromagnetic wave having the desired resonance frequency received by the antenna device 19 is:
The high-frequency circuit section 15 of the mobile phone main body is converted into an electric signal through a feed terminal 16 formed on the first antenna element 10.
Is input to

Next, at the time of transmission, an electric signal of the signal power of the high-frequency circuit section 15 is transmitted in a flow opposite to that at the time of reception, and is radiated from the antenna device 19 as an electromagnetic wave.

Here, the relationship between the first antenna element 10, the second antenna element 18, and the conductive ground plane 17 will be described. The first antenna element 10, the second antenna element 18, and the conductive ground plane 17 are substantially parallel to each other. Since the first antenna element 10 and the second antenna element 18 are arranged between the first antenna element 10 and the conductor ground plane 17, the second antenna element 18 and the conductor ground plane 17, and the first antenna element 10 As a result, the impedance characteristic of the first antenna element 10 and the second antenna element 18 becomes capacitive and has a factor of increasing the resonance frequency of the antenna device 19. It is possible to add more inductive properties by separating from the specified distance from the, and to cancel the reactance component and to match the impedance to approximately 50Ω. That.

As described above, according to the present embodiment, the distance between short-circuit terminal 13 and feed terminal 16, the width and length of each radiating conductor element of plate-shaped first antenna element 10 and second antenna element 18, and It is easy to set the distance between the first antenna element 10 and the second antenna element 18 and the like. Further, by utilizing the electromagnetic coupling between the first antenna element 10 and the second antenna element 18, it is possible to appropriately cope with a desired frequency band. It is possible to obtain an antenna device capable of efficiently obtaining the impedance characteristics obtained, achieving a wider band and higher sensitivity, and achieving a reduction in size.

In addition to the GSM band and the PCN band, the impedance characteristics corresponding to the third frequency band can be reduced by suppressing the influence on the impedance characteristics in the GSM band and the PCN band while suppressing the conductor width of the second antenna element 18. , And the length L3 and the distance between the first antenna element 10 and the second antenna element 18 are set.

The conductor portion of the antenna device 19 may be formed by various conductor forming methods such as printing, sintering, overlapping, and plating.

(Embodiment 2) Using Embodiment 2,
The invention of the second aspect of the present invention will be particularly described.

FIG. 2 is a diagram showing a configuration of an antenna device according to a second embodiment of the present invention.

In the figure, reference numeral 20 denotes a third antenna element, such as copper, copper alloy, aluminum alloy, stainless alloy, etc., arranged on the first radiating conductor element 11 of the first antenna element 10 at predetermined intervals. About λ3 / 8 or about λ5 that resonates in the GSM band consisting of a conductive metal or a thin plate-shaped conductor obtained by plating the conductive metal with a conductive metal such as Au or Ni.
A radiation conductor element 21 having a length of / 8 wavelength is formed, and a terminal 22 is formed at one end of the radiation conductor element 21 to be electrically connected to the vicinity of the feeding point 14 of the first radiation conductor 11 of the first antenna element 10.

In other respects, the antenna device 23 is constructed in the same manner as in the first embodiment.

With this configuration, in addition to the operation of the first embodiment, the first antenna element 10 and the second antenna element 1
8 and the frequency band for obtaining the required characteristics in the GSM band are mainly determined by the third antenna element 20 and the first antenna element 10.
By making a bimodal resonance (double resonance) by electromagnetic field coupling between the conductive ground plate 17 and the conductive ground plate 17, the band can be further widened.

In addition to the third antenna element 23, a radiation conductor having a wavelength of about λ3 / 8 or about λ5 / 8 resonating in the PCN band is provided on the first antenna element 10 and the second radiation conductor element 12. By forming the element, by making it bimodal resonance (multiple resonance) by electromagnetic field coupling as described above,
Further, the frequency band of the PCN band can be widened.

In addition to the GSM band and the PCN band, the impedance corresponding to the third frequency band is determined by changing the conductor width and length of the third antenna element 20 and the distance between the first antenna element 10 and the third antenna element 20. The interval can be set, and as a result, an antenna device having a wide band and high sensitivity corresponding to three frequency bands can be obtained.

(Embodiment 3) Using Embodiment 3,
The invention of the third aspect of the present invention will be particularly described.

FIG. 3 is a diagram showing the configuration of the antenna device according to the third embodiment of the present invention.

As shown in the figure, in the present embodiment, the second radiation conductor element 12 formed on the first antenna element 10 of the antenna device 19 described in the first embodiment is replaced with a substantially meandering second radiation conductor element 12. The first antenna element 25 is formed by providing two radiating conductor elements 24, and otherwise the first embodiment is used.
The antenna device 26 is configured in the same manner as described above.

According to this configuration, since the second radiation conductor element 24 has a substantially meander shape, the length and width of the radiation conductor can be easily set and adjusted. Therefore, the impedance of the first antenna element 25 can be set in the above-described embodiment. The impedance characteristic corresponding to the desired frequency band can be set with higher accuracy than the one.

(Embodiment 4) Using Embodiment 4,
The present invention, particularly, the invention described in claim 4 will be described.

FIG. 4 is a diagram showing a configuration of an antenna device according to a fourth embodiment of the present invention.

In the present embodiment, as shown in the figure, the conductor base plate 1 of the antenna device 19 of the first embodiment is provided on the surface of a printed circuit board 29 in a housing 28 of a mobile phone main body 27.
7, the ground pattern portion 30 formed on the printed circuit board 29 is used as a conductive ground plane, and the short-circuit terminal 13 formed on the first antenna element 10 is pressed against the ground pattern portion 30 formed on the printed circuit board 29. And the power supply terminal 16 is electrically connected to the high-frequency circuit unit 15 of the mobile phone main body 27 by a method such as pressure contact or soldering, and the antenna device 31 is configured. . Other than that, it is the same as the first embodiment.

According to this configuration, in addition to the effect of the first embodiment, since the conductive ground plate is formed using the ground pattern portion 30 in the housing 28 of the mobile phone main body 27,
The degree of freedom of mounting the first antenna element 10 and the second antenna element 18 on the mobile phone main body 27, that is, the antenna device 3
This increases the degree of freedom of mounting the mobile phone on the mobile phone main body 27, and can reduce the size of the mobile phone.

(Embodiment 5) Using Embodiment 5,
The invention of the fifth aspect of the present invention will be particularly described.

FIG. 5 is a diagram showing a configuration of an antenna device according to a fifth embodiment of the present invention.

In the figure, reference numeral 32 denotes a matching circuit composed of at least one reactance element. The matching circuit 32 is electrically connected to the feeding terminal 16 formed on the first antenna element 10 of the antenna device 19 according to the first embodiment. The antenna device 33 is configured by being connected to the antenna. Other than that, it is the same as the first embodiment.

According to this configuration, the matching circuit 32 can easily set the detailed impedance characteristics of the antenna device 33 in a desired frequency band, and can achieve a wider band, a higher sensitivity, and a smaller size. It is.

In this embodiment, the matching circuit 32 is formed on the feed terminal 16 side of the antenna device 33. However, the same effect can be obtained by forming the matching circuit 32 on the short-circuit terminal 13.

(Sixth Embodiment) Using the sixth embodiment,
The present invention, particularly, the invention described in claim 6 will be described.

FIG. 6 is a diagram showing a configuration of a mobile phone according to a sixth embodiment of the present invention.

In the present embodiment, as shown in the figure, the upper portion of a housing 35 of a portable telephone body 34 forms a plane, and a printed circuit board 36 is disposed in the housing 35 and is parallel to the upper surface thereof. The antenna device 19 according to the first embodiment described above with reference to FIG. 1 is arranged and mounted on the printed circuit board 36 of the mobile phone body 34 shown in FIG. The unit 37 has been replaced.

The power supply terminal 16 is electrically connected to a power supply pattern portion 38 formed in the vicinity of the ground pattern portion 37 of the printed circuit board 36 by a method such as pressure contact or soldering, so that the portable telephone body 34 is formed. .

With this configuration, in addition to the effects of the first embodiment, the housing 35 of the mobile phone main body 34 can protect the antenna device 19 from mechanical shock, and the life of the antenna device 19 can be extended. In addition to this, it is possible to reduce the cost of the mobile phone because a matching circuit for impedance characteristic matching in a desired frequency band is not required.

(Seventh Embodiment) Using the seventh embodiment,
The invention of the seventh aspect of the present invention will be described.

FIG. 7 is a diagram showing a configuration of a mobile phone according to a seventh embodiment of the present invention.

In the present embodiment, as shown in the figure, an antenna device 19A similar to that of the first embodiment is provided on the upper end of a printed circuit board 41 in a housing 40 of a portable telephone body 39, and printing is performed. An antenna device 19B similar to that of the first embodiment is provided at the lower end of substrate 41, and antenna device 19A
And 19B of the power supply terminals 16A and 16B are connected to the terminal 44 of the switch 43 of the high-frequency circuit section 42 of the mobile phone main body 39.
A and 44B are electrically connected to each other by a method such as pressure contact or soldering, and similarly, a part of the conductive ground plates 17A and 17B is electrically connected to a ground pattern portion 45 formed on the printed circuit board 41 of the mobile phone body 39. Connected to.

In the portable telephone according to this embodiment, the received power levels of the antenna device 19A and the antenna device 19B are compared, and a diversity communication system is constituted by the switch 43 connecting the antenna device having a large received power and the high frequency circuit section 42. .

With this configuration, the housing 40 of the mobile phone main body 39 is protected from mechanical shock by the antenna devices 19A and 19A.
B can be protected and the service life can be extended, and by using the diversity communication system, good communication quality can be obtained by suppressing the influence of the human body on the radio wave transmission / reception performance when using a mobile phone. Can be.

The diversity communication function may be improved by arranging the two antenna devices 19A and 19B in a positional relationship in a direction orthogonal to each other.

Further, by incorporating the antenna device, the degree of freedom in designing the mobile phone main body 39 can be increased, and the cost of the mobile phone can be reduced since a matching circuit for impedance matching is not required.

[0077]

As described above, according to the present invention, it is possible to realize a high-productivity built-in system which can realize a small, thin, wide band, high sensitivity, and multi-band, and can easily perform impedance adjustment. An advantageous effect that an antenna device can be provided is obtained.

By using the antenna device of the present invention incorporated in a radio device, it is possible to not only protect the antenna device from mechanical shock from the outside, but also to realize multi-band operation.
The broadband, high sensitivity, and space saving of the antenna device mounting area in the wireless device can be reduced in size and thickness, and impedance characteristics corresponding to a desired frequency band can be easily obtained. A complicated impedance matching circuit composed of elements becomes unnecessary,
An advantageous effect that an inexpensive wireless device can be provided is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an antenna device according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of an antenna device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an antenna device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an antenna device according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a mobile phone according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a mobile phone according to a seventh embodiment of the present invention.

FIG. 8 is a conceptual diagram of a conventional antenna device.

FIG. 9 is a perspective view in which a part of a back surface of a mobile phone equipped with a conventional antenna device is cut away.

[Explanation of symbols]

10, 25 First antenna element 11 First radiating conductor element 12, 24 Second radiating conductor element 13 Short-circuit terminal 14 Feed point 15, 42 High-frequency circuit section 16 Feed terminal 17 Conductor ground plane 18 Second antenna element 19, 19A, 19B, 23, 26, 31, 33 Antenna device 20 Third antenna element 21 Radiating conductor element 22, 44A, 44B Terminal 27, 34, 39 Mobile phone main body 28, 35, 40 Housing 29, 36, 41 Printed circuit board 30, 37 Ground Pattern section 32 Matching circuit 38 Power supply pattern section 43 Switch

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Susumu Inazushi 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5J021 AA02 AA03 AB06 CA06 DB04 FA31 FA32 GA02 HA05 HA06 HA10 JA03 JA07 5J045 AA02 AA03 AB05 AB06 DA09 EA07 FA01 GA02 HA06 MA04 NA01 5J046 AA04 AA07 AA12 AB10 AB13 PA07 5J047 AA04 AA07 AA12 AB10 AB13 FD01

Claims (7)

[Claims] A first terminal disposed on the conductor ground plate and electrically connected to the conductor ground plate, having a predetermined distance from the first terminal, and electrically connected to a high-frequency circuit section of the wireless device main body. Plate-shaped first antenna element having a second terminal and at least one radiating conductor element that are electrically connected, and a plate-shaped first antenna element having at least one radiating conductor element that is not directly connected to the conductor ground plane and the first antenna element. A second antenna element, at least one radiating conductor element of the second antenna element is disposed between the conductor ground plane and the first antenna element to form an antenna body, and the first antenna element and the second antenna element
An antenna device in which an antenna element and a conductive ground plane are fixed by a dielectric. 2. The antenna device according to claim 1, further comprising a plate-shaped third antenna element having at least one radiating conductor element electrically connected to a high-frequency circuit section of the wireless device main body. 3. The antenna device according to claim 1, wherein at least one radiation conductor element of the first or second antenna element has a substantially zigzag shape or a substantially meander shape. 4. The antenna device according to claim 1, wherein the conductive ground plane is formed of a conductive ground plane of the wireless device main body or a ground. 5. The antenna device according to claim 1, wherein a matching circuit including at least one reactance element is provided on the second terminal of the first antenna element. 6. The antenna device according to claim 1, wherein the conductor ground plate or the first terminal is electrically connected to a conductor ground plate or a ground of the wireless device main body, and the second terminal is electrically connected to a high-frequency circuit of the wireless device main body. A wireless device, which is connected to and mounted on a wireless device. 7. The antenna device according to claim 1, wherein the conductor ground plate or the first terminal is electrically connected to a conductor ground plate or a ground of the wireless device main body, and the second terminal is connected to the wireless device main body. A wireless device that is electrically connected to and mounted on the high-frequency circuit section of the wireless communication device to perform diversity communication.