JP2003347828A - Antenna device and radio card module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce space, reduce cost, and improve performance. <P>SOLUTION: An antenna device comprises a first antenna pattern 22 for several bands of high-frequency commonly using a feeding pattern part 25, and a second antenna pattern 23 for a low-frequency band. The first antenna pattern 22 is continuously installed in an almost loop shape at a top part of the feeding part 25, and its overall length is about one wavelength of the first frequency. The second antenna pattern 23 is installed continuously into an almost U shape at the top part of the feeding part 25, and composed one side open pattern, whose length is about 1/4 wavelength of the 2nd frequency. A return part 30 is formed in at least one of either the first antenna pattern 22 or the second antenna pattern 23. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-small antenna device having a frequency diversity characteristic and a wireless card module having the antenna device and having a wireless communication function by being mounted on various electronic devices.

[0002]

2. Description of the Related Art For example, information such as music, voice, various kinds of data and images can be easily handled by a personal computer, a mobile device or the like with the recent digitization of data. In addition, an environment in which such information is subjected to band compression by an audio codec technology or an image codec technology and is easily and efficiently distributed to various communication terminal devices by digital communication or digital broadcasting is being prepared. For example, audio / video data (AV data) can be received by a mobile phone.

The wireless communication function is mounted not only on the above-described information processing equipment and communication terminal equipment, but also on various electronic equipment such as audio products, video equipment, camera equipment, printers, and entertainment robots. The wireless communication function includes not only electronic devices but also, for example, an access point for wireless LAN, PCMCIA (Personal Computer).
al Computer Memory Card International Assosiatio
n) Card, CompactFlash (registered trademark) card, Mini PCI (Peripheral Component Interconnecti)
on) A wireless card module having a storage function and a wireless communication function by being mounted on a so-called small accessory card such as a card.

As a wireless communication system, for example, IEEE802.11
Various wireless communication such as a 5.2 GHz band short-range wireless communication system proposed in a, a 2.4 GHz band wireless LAN system proposed in IEEE802.11b, or a short-range wireless communication system called Bluetooh A scheme has been proposed. Various electronic devices, wireless card modules, and the like have an interface specification that enables connection to a plurality of wireless communication systems having different frequency bands, and can transmit and receive radio waves in each frequency band. It is necessary.

For example, a conventional wireless card module 100
Is a card-type module body 101 as shown in FIG.
Communication control unit 102 and signal processing unit 103
And the like, and an antenna unit 104 and a connector unit 105 are provided on both side regions facing each other in the longitudinal direction. The wireless card module 100 includes a connector 105
By being loaded into the slot provided in the main device from the side, the connector portion 105 is connected to the connector portion on the main device side to add a predetermined function including a wireless communication function. When the wireless card module 100 is loaded in the main device, the antenna unit 104 is exposed from the main device, and transmits and receives radio waves.

The wireless card module 100 is provided with an antenna unit 104 for each frequency band as shown in FIG. 9 in order to be able to transmit and receive the above-mentioned radio waves in the 5.2 GHz band and the 2.4 GHz band, for example. Two antennas 104a and 104b are provided. The wireless card module 100 is equipped with an ultra-small ceramic dielectric antenna (chip antenna) having a volume of about 40 mm ³ , for example, so that the antenna unit 104 from the main device can be mounted.
It is also configured to reduce the amount of protrusion of the lens and reduce the size and weight.

The wireless card module 11 shown in FIG.
0 has a so-called diversity configuration that enables transmission and reception of radio waves from different directions. In the wireless card module 110, a first antenna 111 and a second antenna 112 are provided in the antenna unit 104 corresponding to each frequency band, respectively, and each of the first antenna 111 and the second antenna 112 is provided by two antennas 111a, 111b and 112a, 112b. It is composed. The wireless card module 110 is provided such that the respective antennas 111a and 111b of the first antenna 111 and the respective 112a and 112b of the second antenna 112 are orthogonal to each other.

The wireless card module 12 shown in FIG.
0, two antennas 122a corresponding to each frequency band are provided in the antenna unit 121, respectively.
A first antenna 122 having 122b, 123a,
And a second antenna 123 having a second antenna 123b. Wireless card module 1
Reference numeral 20 denotes a so-called inverted-F antenna in which each of the antennas 122 and 123 is formed by patterning a wiring board or performing sheet metal processing on a thin metal plate.

[0009]

The wireless card module 100 shown in FIG. 9 and the wireless card module 110 shown in FIG. 10 are miniaturized by mounting a chip antenna. There is a problem that these chip antennas are relatively expensive and costly. In particular, the wireless card module 11
0 is expensive because a large number of chip antennas are provided to form diversity. The wireless card module 110 is mounted with a chip antenna having a transmission / reception function in a 5.2 GHz band or a 2.4 GHz band, for example, so that the number of mounted chip antennas can be reduced. However, by mounting such a chip antenna on a circuit board, the wireless card module 110 is significantly affected by changes in the electromagnetic field caused by changes in the board size, the material of the housing of the main device, the dielectric constant, the spacing, etc. Change. Accordingly, the wireless card module 110 may cause a deviation in impedance matching due to a change in the characteristics of the chip antenna,
There is a problem that the gain is reduced.

On the other hand, in the above-described wireless card module 120 shown in FIG. 11, by forming the respective antennas 122 and 123 having the inverted F pattern directly on the wiring board, the cost can be significantly reduced. Further, the wireless card module 120 has a feature that each of the antennas 122 and 123 has a wider band as compared with the chip antenna, and has a stable performance because a characteristic change due to an influence of a housing metal part of the main device is small. Have. However, in the wireless card module 120, for example, the first antenna 122 having a characteristic in the 5.2 GHz band requires a volume of about 150 mm ² on the wiring board and has a characteristic in the 2.4 GHz band. 2 antennas 1
23 requires a volume of about 300 mm ² on a wiring board. Therefore, there is a problem that the wireless card module 120 is increased in size by including such an antenna.

Therefore, the present invention has been proposed for the purpose of providing a small antenna device and a wireless card module which save space, reduce costs and improve characteristics.

[0012]

An antenna device according to the present invention that achieves the above object has a length corresponding to substantially one wavelength of a first frequency having a high frequency. One antenna pattern and a second antenna pattern having a length corresponding to approximately 部 wavelength of the second frequency having a lower frequency are provided for each part. The first antenna pattern includes a power supply pattern portion having one end short-circuited to a power supply point, an antenna element pattern portion continuously connected to the power supply pattern portion in a substantially orthogonal state, and a power supply pattern at a tip end of the antenna element pattern portion. And a ground pattern formed in a substantially orthogonal state so as to be opposed to the ground portion and short-circuited to the ground formed at the tip close to the feeding point. In the second antenna pattern, the power supply pattern portion having one end short-circuited to the power supply point is shared with the power supply pattern portion of the first antenna pattern,
An antenna element pattern portion having a substantially U-shape connected to the power supply pattern portion and having an open end is provided. In the antenna device, at least one of the first antenna pattern and the second antenna pattern partially has one or a plurality of substantially U-shaped folded portions.

According to the antenna device of the present invention configured as described above, the radio wave of the first frequency band and the second radio wave of the first frequency band are formed by the combined action of the first antenna pattern and the second antenna pattern having the above-described structure. Since the resonance operation occurs in any of the radio waves in the first and second frequency bands, transmission and reception of both the radio waves in the first frequency band and the radio waves in the second frequency band are enabled. According to the antenna device, as compared with an antenna device in which a chip antenna is mounted on a substrate, characteristic changes due to the influence of a housing metal part of the main device are small, stable performance is achieved, and cost is reduced. In addition, according to the antenna device, since space efficiency is achieved due to significant size reduction, by forming the pair of first antenna pattern and second antenna pattern at different positions from each other, ,
It is possible to construct an inexpensive diversity excellent in reliability and wideband characteristics. Furthermore, according to the antenna device, it is possible to construct a diversity excellent in reliability and wideband characteristics by complementing the directivity and the polarization characteristics by using the antenna device in common with, for example, a chip antenna.

A wireless card module according to the present invention that achieves the above-mentioned object has a communication control section and a signal processing section built into a card-type module main body, and an antenna section and a connector section are provided to expose the antenna section. In this state, the connector is connected to the connector provided in the main device by being loaded into the slot provided in the main device, thereby adding a wireless communication function. In the wireless card module, the antenna section has a loop-shaped antenna whose one end is short-circuited to the feed point and the other end is short-circuited to the ground point, and whose total length corresponds to substantially one wavelength of the first frequency having a high frequency. A first antenna pattern, one end of which is short-circuited to a feeding point and the other end of which is open and whose overall length is approximately 1
And a second antenna pattern having a length corresponding to / 4 wavelength. In the wireless card module, at least one of the first antenna pattern and the second antenna pattern of the antenna portion is formed to have one or a plurality of folded portions in a part.

According to the wireless card module of the present invention configured as described above, the antenna projects from the connector to the outside of the main unit when the antenna is inserted into the slot provided in the main unit. According to the wireless card module, due to the combined action of the first antenna pattern and the second antenna pattern having the above-described structure, the resonance operation is performed in each of the radio waves in the first frequency band and the radio waves in the second frequency band. The communication function that enables transmission and reception of both the radio waves in the first frequency band and the radio waves in the second frequency band is added to the main device. According to the wireless card module, compared to an antenna device having a chip antenna mounted on a substrate,
It is intended to have stable performance with little change in characteristics due to the influence of the housing metal part of the main device and to reduce the cost. In addition, according to the wireless card module, space efficiency is achieved by mounting a pattern antenna that has been significantly reduced in size, so that a pair of pattern antennas can be formed at different positions from each other. It is possible to configure an inexpensive diversity excellent in reliability and wideband characteristics by suppressing the increase in the number of channels. Further, according to the wireless card module, the directivity and the polarization characteristics are complemented by using the wireless card module in common with the chip antenna, so that it is possible to configure diversity having excellent reliability and wideband characteristics.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. The wireless card module 10 shown in the embodiment is loaded into a slot 2 provided in a personal computer, a mobile device, or various electronic devices (main device 1) as necessary, for example, as shown in FIG. , This main unit 1
To add a wireless communication function. The wireless card module 10 has a storage function and exchanges data with the main device 1. The wireless card module 10
Other functions are equivalent to those of the conventional card module.

The wireless card module 10 has an antenna device 20 that has transmission and reception characteristics for radio waves in two types of frequency bands, for example, 5.2 GHz band and 2.4 GHz band, and also has diversity characteristics. The wireless card module 10 is loaded into the main device 1 with a part thereof protruding. As will be described in detail later, the antenna device 20 is mounted on the protruding portion. The wireless card module 10 is used when the main device 1 is unnecessary.
The wireless card module 10 to be detached has a so-called card-size module main body 11 in which various members described below are mounted on a wiring board 12 as a base material, and the module main body 11 is housed in a casing (not shown). .
As shown in FIG. 4, the wireless card module 10 has a connector 13 on the main surface of the module main body 11 in a region on the first end 12 a side of the wiring board 12 to be loaded on the main body device 1. And the connector 1
The antenna device 20 is mounted in a region on the side of the second end 12b facing the antenna device 3. When the wireless card module 10 is loaded into the slot 2, the connector 13 is connected to a connector built in the main device 1.

In the wireless card module 10, for example, a memory element 14 for a storage function
A baseband signal processing LSI 15 or a high-frequency signal processing RF module 16 is mounted. The wireless card module 10 further includes an electronic component 17, a radio wave absorbing material 18, and the like. Wireless card module 10
The above-mentioned members are placed on the wiring board 12 at the first end 12.
By arranging and mounting in order from the a side as shown in FIG. 4, the configuration is such that internal loss can be reduced. The function of the wireless card module 10 is reduced due to interference of the RF module 16 with the antenna device 20.

The wireless card module 10 is housed in a housing such that the module body 11 faces the connector section 13 and the antenna device 20 outward. Although the connector portion 13 is composed of a large number of conductor patterns formed on the wiring board 12, the connector portion 13 may be, for example, a plug-type terminal, or may have a form conforming to the standard of the wireless card module 10. It is formed. The wireless card module 10 includes not only the above-mentioned components but also appropriate electronic components and the like.

The module body 11 includes a wiring substrate 1 as a base material.
2 is, for example, a relatively inexpensive FR4 grade commonly used as an antenna substrate (heat-resistant grade 4: Flame Retardan
t Grade) flame-resistant glass-based epoxy resin copper-clad laminated board is used. Of course, the wiring board 12 is made of, for example, PET.
An appropriate substrate material such as a film substrate, a Teflon (registered trademark) -ceramic composite substrate, or a ceramic substrate may be used. By using a high dielectric constant base material for the wiring board 12, the module body 11 can be reduced in size by reducing the resonance frequency. The module body 11 forms an appropriate conductor pattern including an antenna pattern described later, a land, and the like on the surface of the wiring board 12 by performing, for example, photolithographic processing on the copper foil bonded to the base material, A ground pattern and a land are formed.

The wireless card module 10 is mounted on the wiring board 12 with a pattern antenna 21 having an antenna device 20 formed of a first antenna pattern 22 and a second antenna pattern 23 formed on the wiring board 12. And a chip antenna element 19. The antenna device 20 is configured such that the pattern antenna 21 has the first antenna pattern 22 and the second antenna pattern 23 in the same process as the above-described conductor patterns and the like.
Formed on top. In the antenna device 20, the chip antenna element 19 is mounted on the wiring board 12 in the same process as the above-described members and the like. Chip antenna element 19
The details are omitted, but 5.2 GHz band and 2.4 GHz
It has transmission and reception characteristics for band radio waves.

The antenna device 20 makes it possible to secure a mounting area for the chip antenna element 19 on the wiring board 12 by forming the pattern antenna 21 in a small size, as will be described in detail later. Therefore, the antenna device 20 includes the pattern antenna 21 and the chip antenna element 1
9 has a wider bandwidth and a stable operation characteristic while having a space almost equivalent to the diversity obtained by combining the conventional chip antenna elements 19, and reduces the number of parts and cost. It will be planned.

The pattern antenna 21 is mainly composed of 5.2 GHz.
The first antenna pattern 22 has transmission and reception characteristics for radio waves in the z band, and the second antenna pattern 23 has transmission and reception characteristics mainly for radio waves in the 2.4 GHz band. In the pattern antenna 21, the first antenna pattern 22 and the second antenna pattern 23 share a power supply pattern portion 25 short-circuited to a power supply point (power supply land) 24, and each of the first antenna pattern 22 and the second antenna pattern 23 starts from a distal end portion of the power supply pattern portion 25. Antenna element pattern portions 26 and 27 are integrally connected. The pattern antenna 21 is configured such that a first antenna pattern 22 and a second antenna pattern 23 are formed so that the pattern shapes and the entire lengths of the antenna element pattern portions 26 and 27 are different.

That is, as shown in FIG. 1, the RF module 1 is located on the wiring board 12 at a predetermined interval from the second end 12a and slightly one side of the center in the width direction.
A power supply land 24 receiving power from the power supply 6 is formed.
In the wiring board 12, one end of the power supply land 24 is short-circuited to the power supply land 24, and a power supply pattern portion 25 shared by the first antenna pattern 22 and the second antenna pattern 23 extends near the second end 12a. Is formed. Wiring board 1
The first antenna pattern 22 is divided into a first region 12c and a second region 12d in the width direction by the power supply pattern portion 25, and the first antenna pattern 22
The antenna element pattern portion 27 of the second antenna pattern 23 is formed in the narrow second region 12d.

In the first antenna pattern 22, the antenna element pattern portion 26 is bent at a right angle at the tip of the power supply pattern portion 25, and the second end portion 12a of the wiring board 12 is formed.
The pattern is formed as a pattern extending in parallel with. First
The antenna pattern 22 is bent at a right angle at the end of the antenna element pattern portion 26 and a ground pattern portion 28 is continuously provided as a pattern facing the power supply pattern portion 25. The first antenna pattern 22 is formed by short-circuiting the tip of the ground pattern portion 28 with the ground pattern 29 formed on the wiring board 12. Ground pattern 2
9 is connected through a through-hole 29a to a ground pattern formed on the back surface of the wiring board 12 with a large area, though not described in detail, and as shown in FIG. Extending in the vicinity.

The first antenna pattern 22 forms a loop pattern from the power supply land 24 to the power supply pattern section 25, the antenna element pattern section 26, the ground pattern section 28, and the ground pattern 29. Also,
The first antenna pattern 22 includes a power supply pattern unit 25-
The total length from the antenna element pattern portion 26 to the ground pattern portion 28 is formed with a length corresponding to approximately one wavelength of a 5.2 GHz band radio wave.

The first antenna pattern 22 configured as described above uses the communication power supplied from the RF module 16 via the feed land 24 by the combined action with the second antenna pattern 23 described later. 5.2 GHz between the ground pattern 29 and the path indicated by one broken line
Resonates and radiates in the z band. Further, the first antenna pattern 22 receives a 5.2 GHz band radio wave transmitted from the outside by exciting a resonance current between the power supply land 24 and the ground pattern 29.

The second antenna pattern 23 is formed such that the antenna element pattern section 27 is located on the opposite end of the first antenna pattern 22 from the antenna element pattern section 26 at the leading end of the common feeding pattern section 25 as shown in FIG. They are bent at right angles toward each other and are continuously connected. The second antenna pattern 23 includes a first pattern portion 27a to a third pattern portion 27c in which the antenna element pattern portion 27 is continuously formed in a substantially U-shape. One end of the second antenna pattern 23 is short-circuited to the power supply land 24 via the power supply pattern portion 25, and the third pattern portion 27c on the free end side is opened.

The first pattern portion 27a is formed so as to extend from the tip of the power supply pattern portion 25 in parallel with the second end portion 12a of the wiring board 12. Second pattern portion 27b
Is formed so as to be bent at a right angle at the tip of the first pattern portion 27a and to extend opposite to the power supply pattern portion 25. The third pattern portion 27c is formed by being bent at a right angle toward the power supply pattern portion 25 at the tip of the second pattern portion 27b. The second antenna pattern 23 is composed of a pattern having a substantially U-shape as a whole due to the above-described portions, and has one end side connected to the feeding pattern portion 2.
5 and short-circuited with the power supply land 24, and is configured as a one-sided open pattern in which the front end side close to the power supply pattern portion 25 is opened.

In the antenna element pattern portion 27, a folded portion 30 is formed at a part of the second pattern portion 27b. As shown in FIG. 1, the folded portion 30 is formed by folding so that a part of the second pattern portion 27 b protrudes toward the power supply pattern portion 25 in a convex shape. The second antenna pattern 23 is formed such that the entire length of the power supply pattern portion 25 and the antenna element pattern portion 27 has a length corresponding to approximately 波長 wavelength of a 2.4 GHz band radio wave.

The second antenna pattern 23 configured as described above uses the combined power of the first antenna pattern 22 and the communication power supplied from the RF module 16 via the power supply land 24 by the combined action. It resonates and radiates in the 2.4 GHz band along the path indicated by the dashed line. Further, the second antenna pattern 23 excites and receives a resonance current with a 2.4 GHz band radio wave transmitted from the outside.

As described above, in the pattern antenna 21, the first antenna pattern 22 and the second antenna pattern 23 share the power supply pattern portion 25 and are formed on both side regions of the power supply pattern portion 25, respectively. A folded portion 30 is formed in a part of the antenna element pattern portion 27 of the second antenna pattern 23. The pattern antenna 21 is formed with a small space on the wiring board 12 by such a configuration, thereby reducing the size of the antenna device 20. The antenna device 20 includes a pattern antenna 21 with respect to the wiring board 12 as shown in FIG.
Has a length M1 in the width direction of about 24 mm and a length N1 in the protruding direction.
Is formed in a region of about 10 mm, so that the chip antenna element 19 can be mounted without increasing the size.

The antenna device 20 is configured by combining the chip antenna element 19 and the pattern antenna 21 to have transmission / reception characteristics with respect to radio waves in the 5.2 GHz band and the 2.4 GHz band. This antenna device 2
For 0, a simulation of the return loss characteristics was performed. For the simulation, an VSWR value was obtained using an electromagnetic field simulator HFSS manufactured by Agilent Technologies. FIG. 2 is a diagram showing the results of this simulation, in which the vertical axis represents the VSWR value (Voltage Standing Wave Rat).
io: standing wave ratio), and the horizontal axis is frequency GHz.

As is apparent from the above-described simulation results, the antenna device 20 has a characteristic value of VSWR <3, which is used as an index for a portable telephone, for example, at 2.4G.
About 1.2 GHz in Hz band, about 2 G in 5.2 GHz band
A wider band of Hz is achieved. Also, the antenna device 2
0 is 2.4 even with a more severe characteristic value of VSWR <2.
Approx. 375 MHz in GHz band, approx. 6 in 5.2 GHz band
A wide band of 50 MHz has been achieved. Note that a general chip antenna element has a relatively wide band characteristic in a 5.2 GHz band, but is known to have a characteristic of about 150 MHz in a 2.4 GHz band.

The antenna device 35 shown in FIG. 5 has a pattern antenna 36 having a different pattern shape mounted on the antenna device 20 described above. Since the antenna device 35 has the same configuration as the above-described antenna device 20 except for the pattern antenna 36, the corresponding portions are denoted by the same reference numerals and description thereof will be omitted. The pattern antenna 36 also has a feeding pattern section 39.
And a first antenna pattern 37 having transmission / reception characteristics for mainly 5.2 GHz band radio waves.
And a second antenna pattern 38 having transmission / reception characteristics for radio waves in the 4 GHz band. Also in the pattern antenna 36, the first antenna pattern 37 is formed so that the entire length including the power supply pattern section 39 has a length corresponding to substantially one wavelength of a 5.2 GHz band radio wave, and the second antenna pattern 38 1. The total length including the power supply pattern portion 39 is 2.
It is formed with a length corresponding to approximately 波長 wavelength of a 4 GHz band radio wave.

In the pattern antenna 36, a first folded portion 40 is formed in a part of the power supply pattern portion 39 so as to be bent to the side in a convex shape. The pattern antenna 36
A first antenna pattern 37 and a second antenna pattern 38 are connected to each other at the end of the power supply pattern portion 39 at right angles in both directions. The first antenna pattern 37 has an antenna element pattern portion 41 extending in parallel with the second end 12 a of the wiring board 12, and a front end of the antenna element pattern portion 41 facing the power supply pattern portion 39. And a ground pattern portion 42 bent at a right angle.

The ground pattern portion 42 is formed by short-circuiting the tip portion with the ground pattern 29 formed on the wiring board 12. The ground pattern 29 is connected to the ground pattern formed with a large area on the back surface of the wiring board 12 through the through hole 29 a as described above, and has one end close to the power supply land 24. Extending. The ground pattern portion 42 has a second folded portion 43 corresponding to the first folded portion 40 of the power supply pattern portion 39. The second folded portion 43 is formed by bending a part of the pattern in a convex shape toward the power supply pattern portion 39 side.

The first antenna pattern 37 also forms a loop pattern from the power supply land 24 to the power supply pattern 39, the antenna element pattern 41, the ground pattern 42, and the ground pattern 29. Also,
As described above, the first antenna pattern 37 has a length corresponding to approximately one wavelength of a 5.2 GHz band radio wave, as described above, in which the entire length from the power supply pattern portion 39 to the antenna element pattern portion 41 to the ground pattern portion 42 is obtained. It is formed. First
Of the wiring board 1 as described above.
By forming the first folded portion 40 and the second folded portion 43 on the power supply pattern portion 39 and the ground pattern portion 42 extending in the length direction of the second 2, respectively, the length N in the protruding direction is obtained.
2 is shortened.

The first antenna pattern 37 configured as described above supplies the communication power supplied from the RF module 16 via the power supply land 24 by a combined action with a second antenna pattern 38 described later. Pattern 39-antenna element pattern 41-ground pattern 4
5.2G with the ground pattern 29 by the route 2
Resonates and emits in the Hz band. Further, the first antenna pattern 37 is configured to transmit 5.2 GHz transmitted from the outside.
The radio wave in the band is received by exciting a resonance current between the power supply land 24 and the ground pattern 29 through the above-described path.

As described above, the second antenna pattern 38 is formed by the power supply pattern section 39 having the first antenna pattern 3
7 and the base end of the antenna element pattern portion 44 at the front end is the first antenna pattern 37.
It is bent at a right angle toward the opposite side and is continuously provided.
As shown in FIG. 5, the antenna element pattern portion 44 is bent at a right angle toward the second end portion 12a of the wiring board 12 at a position substantially equal to the amount of protrusion of the first folded portion 40 described above. At the same time, the first antenna pattern 37 is bent at a right angle so as to extend in parallel with the antenna element pattern portion 41 of the first antenna pattern 37 at a position in the vicinity of the end portion 12a, so that the first antenna pattern 37 has a substantially substantially U-shape. The tip of the antenna element pattern section 44 is open at substantially the same position as the antenna element pattern section 41 of the first antenna pattern 37.

As described above, the second antenna pattern 38 is formed by forming the antenna element pattern section 44 into a substantially deformed U-shape, and the antenna element pattern section 41 of the first antenna pattern 37 and the second End 12a
Are formed so as to extend to a region between the two. Therefore, the second antenna pattern 38 shortens the length M2 in the width direction.

As described above, the second antenna pattern 38 includes the power supply pattern section 39 and the antenna element pattern section 2.
7 is formed with a length corresponding to approximately １ ／ wavelength of a radio wave in the 2.4 GHz band. The second antenna pattern 38 converts the communication power supplied from the RF module 16 via the power supply land 24 to 2.4 G by the combined action with the first antenna pattern 37 described above.
Resonates and emits in the Hz band. The second antenna pattern 38 is a 2.4 GHz signal transmitted from the outside.
The resonance current is excited and received by the radio wave of the band.

In the pattern antenna 36, as described above, the first antenna pattern 37 and the second antenna pattern 38 share the power supply pattern section 39. In the pattern antenna 36, the first folded portion 40 is formed in the power supply pattern portion 39, and the second folded portion 43 is also formed in the ground pattern portion 42 of the first antenna pattern 37. The pattern antenna 36 has an antenna element pattern section 44 of the second antenna pattern 38 which is substantially deformed in a substantially U-shape, and an antenna element pattern section 41 of the first antenna pattern 37 and the second end 12 a of the wiring board 12.
In the region between them. Pattern antenna 36
The antenna device 3 is formed by forming the first antenna pattern 37 and the second antenna pattern 38 on the wiring board 12 with a small space by using such a configuration.
5 is downsized. As shown in FIG. 5, the antenna device 35 forms the pattern antenna 36 with respect to the wiring board 12 such that the length M2 in the width direction is about 19 mm and the length N2 in the protruding direction is about 6 mm.
Area can be formed.

With respect to the above-described antenna device 35, similarly to the antenna device 20, a simulation of a return loss characteristic for obtaining a VSWR value was performed using an electromagnetic field simulator HFSS manufactured by Agilent Technologies. FIG.
Is a diagram showing the results of this simulation, in which the vertical axis represents the VSWR value (Voltage Standing Wave Ratio) and the horizontal axis represents the frequency GHz.

As is clear from the simulation results, the antenna device 35 can achieve a wide band of about 250 MHz in the 2.4 GHz band and a wide band of about 2 GHz in the 5.2 GHz band at the characteristic value of VSWR <3. Have been. Further, the antenna device 35 can achieve a wider band of about 160 MHz in the 2.4 GHz band even with a more severe characteristic value of VSWR <2 and 5.2.
A wide band of about 1.2 GHz has been achieved in the GHz band.

The antenna device 50 shown in FIG. 7 also has a first antenna pattern 52 having transmission / reception characteristics mainly for 5.2 GHz band radio waves and a second antenna pattern 52 having mainly transmission / reception characteristics for 2.4 GHz band radio waves. The antenna pattern 53 includes a pattern antenna 51 that shares the power supply pattern unit 54. The pattern antenna 51 is
Has the same pattern shape as the first antenna pattern 37 of the antenna device 35 shown as the second embodiment described above. In the pattern antenna 51, the second antenna pattern 53 has the same pattern shape as the second antenna pattern 23 of the antenna device 20 shown as the first embodiment described above.

That is, the pattern antenna 51 has a first folded portion 55 formed in a part of the power supply pattern portion 54 in a laterally convex shape. The pattern antenna 51 has a first antenna pattern 52 and a second antenna pattern 53 that are bent at right angles in both directions at the end of the power supply pattern portion 54, respectively. First
The antenna element pattern portion 56 extends in parallel with the second end 12a of the wiring board 12.
And a ground pattern portion 57 bent at a right angle so as to face the power supply pattern portion 54 at the tip of the antenna element pattern portion 56.

In the first antenna pattern 52, the tip of the ground pattern portion 57 is short-circuited to the ground pattern 29 formed on the wiring board 12, and a part of the ground pattern portion 57 has the first feed pattern portion 54. Folding part 5
5, a second folded portion 58 having a convex shape is formed. The entire length of the first antenna pattern 52 including the power supply pattern portion 54 has a length corresponding to approximately one wavelength of a 5.2 GHz band radio wave. The ground pattern 29 is connected to the ground pattern formed with a large area on the back surface of the wiring board 12 through the through hole 29 a as described above, and has one end close to the power supply land 24. Extending.

The first antenna pattern 52 forms a loop pattern from the power supply land 24 to the power supply pattern portion 54, the antenna element pattern portion 56, the ground pattern portion 57, and the ground pattern 29. The first antenna pattern 52 includes a power supply pattern portion 54 and a ground pattern portion 57 extending in the length direction of the wiring board 12.
The first folded portion 55 and the second folded portion 58 respectively.
The length in the protruding direction is shortened by forming.

The first antenna pattern 52 configured as described above supplies the communication power supplied from the RF module 16 via the power supply land 24 by the combined action with the second antenna pattern 52 described later. Pattern part 54-antenna element pattern part 56-ground pattern part 5
5.2G between the ground pattern 29 and the route 7
Resonates and emits in the Hz band. The first antenna pattern 52 is configured to transmit 5.2 GHz transmitted from outside.
The radio wave in the band is received by exciting a resonance current between the power supply land 24 and the ground pattern 29 through the above-described path.

The second antenna pattern 53 is formed by bending the antenna element pattern portion 59 at the end of the feed pattern portion 54 at a right angle toward the side opposite to the antenna element pattern portion 56 of the first antenna pattern 52. Be done. In the second antenna pattern 53, the antenna element pattern portion 56 has a substantially U-shape as a whole. One end of the second antenna pattern 53 is short-circuited with the feed land 24, and the free end side is open. In the second antenna pattern 53, a third folded portion 60 is formed at a portion facing the power supply pattern portion 54. The third folded portion 60 includes the power supply pattern portion 5
It is folded back so as to project in a convex shape to the four sides. The second antenna pattern 53 includes the power supply pattern unit 5.
4 is formed with a length corresponding to approximately 波長 wavelength of a 2.4 GHz band radio wave.

The second antenna pattern 53 configured as described above uses the communication power supplied from the RF module 16 via the power supply land 24 by the combined action with the first antenna pattern 52 described above. Resonates and radiates in the 4 GHz band. Further, the second antenna pattern 53 excites and receives a resonance current with a 2.4 GHz band radio wave transmitted from the outside.

In the pattern antenna 52, as described above, the first antenna pattern 52 and the second antenna pattern 53 share the power supply pattern section 54. The pattern antenna 52 includes a first folded portion 55
And the second folded portion 58 is formed in the ground pattern portion 57 of the first antenna pattern 52 to shorten the length in the protruding direction. The pattern antenna 53 has an antenna element pattern portion 59 of the second antenna pattern 53 formed into a deformed U-shape as a whole, and a third folded portion 58 is partially formed. The pattern antenna 52 is formed with a small space on the wiring board 12 by such a configuration, so that the antenna device 5
0 is downsized.

In each of the above embodiments,
Although the respective pattern antennas of the antenna device are formed on the wiring substrate 12 in a pattern, the present invention is not limited to such a configuration. The antenna device is manufactured by performing precision press processing, laser cutting, or the like on a copper foil or an appropriate metal thin plate to produce an antenna member having a predetermined shape, and joining the antenna member to the wiring board 12. Is also good.

Each of the antenna devices according to the embodiments is configured as a composite antenna in which a pattern antenna and a chip antenna element 19 are mounted on a wiring board 12. For example, FIG.
The antenna unit 70 may be configured by a first pattern antenna 71 and a second pattern antenna 72 as in the wireless card module 10 shown in FIG. That is, the antenna unit 70 includes the first pattern antenna 71 and the second pattern antenna 71 formed with the same pattern configuration.
And the pattern antenna 72 are formed on the wiring board 12 so as to be symmetrical with each other in the width direction and separated from each other.

The first pattern antenna 71 is mainly composed of 5.
A loop-shaped first antenna pattern 73 having transmission / reception characteristics for radio waves in the 2 GHz band;
A second antenna pattern 74 having transmission / reception characteristics for band radio waves and having a folded portion is formed. The first pattern antenna 71 is formed on the wiring board 12 with the second antenna pattern 74 located on the center side.

The second pattern antenna 72 is mainly composed of 5.
A loop-shaped first antenna pattern 75 having transmission / reception characteristics with respect to a radio wave of a 2 GHz band,
A second antenna pattern 76 having transmission / reception characteristics for band radio waves and having a folded portion. The second pattern antenna 71 has a second antenna pattern 74.
Is formed on the wiring board 12 so as to face the second antenna pattern 74 of the first pattern antenna 71 and to be located on the center side.

The antenna section 70 has a first
Pattern antenna 71 and second pattern antenna 72
Are formed at different positions from each other, so that they constitute diversity. The antenna unit 70 does not occupy a large space on the wiring board 12 because the first pattern antenna 71 and the second pattern antenna 72 are each downsized. Antenna part 7
A value of 0 makes it possible to configure an inexpensive diversity that is excellent in reliability and broadband characteristics while suppressing an increase in size.

The directivity of the antenna section 70 is improved by forming the first pattern antenna 71 and the second pattern antenna 72 on the wiring board 12 in plane symmetry. In the antenna unit 70, the first pattern antenna 71 and the second pattern antenna 72 may be formed at different positions on the wiring board 12 from the basic mode of configuring diversity, and their directions are particularly limited. It is not done.

Note that the first pattern antenna 71 and the second
The pattern antenna 72 has the same pattern configuration as the pattern antenna 21 shown as the above-described first embodiment, but is not limited to this configuration. The first pattern antenna 71 and the second pattern antenna 72 are formed using the pattern shapes of the pattern antenna 36 shown as the second embodiment and the pattern antenna 51 shown as the third embodiment. May be.

Although the antenna device has transmission / reception characteristics for radio waves in the 5.2 GHz band and radio waves in the 2.4 GHz band, it may have transmission / reception characteristics for radio waves in other frequency bands. Of course it is good.

[0062]

As described above in detail, according to the antenna apparatus of the present invention, the pattern comprising the first antenna pattern and the second antenna pattern having transmission / reception characteristics with respect to radio waves in different frequency bands. The antenna is formed very small. According to the antenna device,
Compared to an antenna device with a chip antenna mounted on a substrate, it is a small multi-band that has stable performance with less change in characteristics due to the influence of the housing metal part of the main unit and has reduced costs compared to an antenna device with a chip antenna mounted on the substrate An antenna can be configured. Further, according to the antenna device, by forming the pair of pattern antennas at different positions, it is possible to suppress an increase in size and configure a diversity excellent in reliability and wideband characteristics. Furthermore, according to the antenna device, by using the pattern antenna and the chip antenna element in common, the directivity and the polarization characteristics are complemented with each other, and it is possible to configure diversity having excellent reliability and wideband characteristics. is there.

According to the wireless card module of the present invention, there is provided a pattern antenna formed of the first antenna pattern and the second antenna pattern having transmission / reception characteristics for radio waves of different frequency bands and formed in a space-saving manner. Therefore, the amount of protrusion from the main unit in use can be suppressed to the minimum level equivalent to that of an antenna device with a chip antenna mounted on a board, not hindering, improving usability, and from the outside. The occurrence of damage and the like due to the impact of the above is suppressed. According to the wireless card module, it has a wide band characteristic, a stable characteristic with little characteristic change due to the influence of the housing metal part of the main device, and a cost reduction. According to the wireless card module, directivity and polarization characteristics are complemented by adopting a pair of pattern antennas formed at different positions or a shared configuration of the pattern antenna and the chip antenna element, thereby improving reliability and reliability. It is possible to configure diversity having excellent broadband characteristics.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part for explaining a basic configuration of an antenna device according to the present invention.

FIG. 2 is a diagram showing a result of simulating a return loss characteristic of the antenna device.

FIG. 3 is an explanatory diagram of a use state of the wireless card module according to the present invention.

FIG. 4 is a plan view of a main part of the wireless card module.

FIG. 5 is a plan view of a principal part for explaining a basic configuration of an antenna device shown as a second embodiment.

FIG. 6 is a diagram showing a result of simulating a return loss characteristic of the antenna device.

FIG. 7 is a main part plan view for explaining a basic configuration of an antenna device shown as a third embodiment.

FIG. 8 is a plan view of a main part of a wireless card module having a diversity configuration including a pair of pattern antennas.

FIG. 9 is a plan view of a main part of a conventional wireless card module.

FIG. 10 is a plan view of a main part of a conventional wireless card module having diversity characteristics.

FIG. 11 is a plan view of a main part of another conventional wireless card module having diversity characteristics.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main apparatus, 2 slots, 10 wireless card module, 11 module main body, 12 wiring board, 13
Connector section, 19 chip antenna element, 20 antenna apparatus, 21 pattern antenna, 22 first antenna pattern, 23 second antenna pattern, 24 feed land, 25 feed pattern section, 26 antenna element pattern section, 27 antenna element pattern section , 28 ground pattern part, 29 ground pattern, 30 folded part,
35 antenna apparatus, 36 pattern antennas, 37 first antenna pattern, 38 second antenna pattern, 39 feed pattern section, 40 first folded section, 4
1 antenna element pattern section, 42 ground pattern section,
43 second folded portion, 44 antenna element pattern portion, 50 antenna device, 51 pattern antenna, 5
2 1st antenna pattern, 53 2nd antenna pattern, 54 feed pattern section, 55 first folded section, 56 antenna element pattern section, 57 ground pattern section, 58 second folded section, 59 antenna element pattern section, 60 third folded portion, 70 antenna portion, 71
First pattern antenna, 72 Second pattern antenna

Claims (8)

[Claims] 1. A power supply pattern portion having one end short-circuited to a power supply point, an antenna element pattern portion connected to the power supply pattern portion in a substantially orthogonal state, and the power supply pattern portion provided at a tip end of the antenna element pattern portion. And a substantially loop-shaped pattern consisting of a ground pattern portion that is connected in a substantially orthogonal state so as to face the ground and that is short-circuited to the ground formed near the power feeding point. A first antenna pattern having a length corresponding to substantially one wavelength of a first frequency having a high frequency; A second antenna element pattern portion having a continuous end and an open end, wherein the entire length of each pattern portion has a length corresponding to approximately 波長 wavelength of the second frequency having a low frequency. Antenna And at least one of the first antenna pattern and the second antenna pattern is formed to have one or a plurality of folded portions in part. Antenna device. 2. The first antenna pattern and the second antenna pattern
The antenna device according to claim 1, wherein the antenna pattern is formed so as to be opposed to both side regions divided by the power supply pattern portion. 3. The antenna device according to claim 2, wherein the second antenna pattern is connected to the power supply pattern portion so that the antenna element pattern portion is parallel to the antenna element pattern portion of the first antenna pattern. The antenna device according to claim 1. 4. In the vicinity of one end of the wiring board or the board,
The antenna device according to claim 1, wherein a diversity is configured by mounting a pair at different positions. 5. The first antenna pattern and the second antenna pattern
And a chip antenna element is mounted adjacent to the first antenna pattern and the second antenna pattern to form diversity. The antenna device according to claim 1. 6. A card type module main body in which a communication control section and a signal processing section are built in, an antenna section and a connector section are provided, and the card type module body is loaded into a slot provided in the main body device with the antenna section exposed. By connecting the connector section to a connector section provided on the main device, the wireless card module adds a wireless communication function, wherein the antenna section has one end short-circuited to a feeding point and the other end grounded. A loop-shaped first antenna pattern that is short-circuited and has a length corresponding to approximately one wavelength of a first frequency having a high frequency, one end short-circuited to the feeding point and the other end opened and And a second antenna pattern having a length corresponding to approximately ４ wavelength of the second frequency having a lower frequency. The antenna pattern and the second antenna pattern share a power supply pattern portion, and at least one of the antenna patterns is formed to have one or a plurality of folded portions in part. Wireless card module. 7. The wireless card module according to claim 6, wherein the antenna section comprises a pair of pattern antennas mounted at different positions from each other to form diversity. 8. The pattern antenna, comprising: the pattern antenna; and a chip antenna element having the first frequency characteristic and the second frequency characteristic and mounted on the module body. 7. The wireless card module according to claim 6, wherein diversity is constituted by the chip antenna element.