JP2002290130A - Radio communication unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit/receive radio waves with high directivity and to shield the radio waves especially to the head direction of a user, when a radio communication unit is applied to a portable telephone set. SOLUTION: The radio communication unit which transmits and receives radio waves is provided with a wiring board for mounting antenna 1, a chip antenna device 50, having a loop antenna-like conductor 23 and is mounted on the antenna fitting position 5 of the wiring board 1 and a shielding member 30, arranged on the wiring board 1 side of a face confronting the conductor 23 of the chip antenna device 50. The radio waves from the conductor 23 to the direction of the wiring board 1 can be shielded, and the radio waves can be transmitted/received with high directivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device suitable for application to a portable telephone or the like which transmits and receives radio waves by mounting a chip antenna device.

[0002]

2. Description of the Related Art In recent years, small-sized mobile communication devices such as mobile phones have been getting more and more sophisticated, and the frequency of use has been getting higher and higher.

FIG. 9 shows a wireless communication device 90 according to a conventional example. This wireless communication device 90 has a wiring board 91. This wiring board 91 is for mounting an antenna device for transmitting and receiving a radio wave. On the wiring board 91, a wiring pattern 98 is provided. This wiring pattern 98 transmits an electric signal to the antenna device, or
This is for receiving an electric signal from the antenna device.

[0004] Further, the wireless communication device 90 includes a wiring board 91.
The chip antenna device 95 is provided at a predetermined upper position.
This chip antenna device 95 has a base 9 made of an insulating member.
7 and a conductor 96 having a loop antenna shape on a base body 97. The conductor 96 is, for example, 795M
It resonates with a radio wave or an electric signal of Hz, and can transmit and receive a radio wave of 795 MHz.

[0005]

According to the wireless communication device 90 according to the conventional system, the radio wave is radiated in a direction perpendicular to the surface facing the conductor 96. The radio wave in the 91 direction cannot be shielded. Therefore, when the device 90 is applied to a mobile phone or the like, the head or the like of the user of the mobile phone is connected to the wiring board 91.
The radio wave is radiated in a state of approaching the back surface of the user, which may impair the health of the user.

Therefore, the present invention has been made to solve such a conventional problem, and enables transmission and reception of radio waves with high directivity. When the radio communication device is applied to a portable telephone or the like, In particular, it is an object of the present invention to provide a wireless communication device capable of shielding a radio wave toward a user's head.

[0007]

In order to solve the above-mentioned problems, a radio communication device according to the present invention is a radio communication device for transmitting and receiving radio waves, comprising a substrate for mounting an antenna and an antenna pattern having a predetermined shape. And an antenna device mounted on a predetermined position of the substrate, and a shielding member provided on a side of the substrate facing the antenna pattern of the antenna device. ADVANTAGE OF THE INVENTION According to the radio | wireless communication apparatus which concerns on this invention, a radio wave in the direction of a board | substrate from an antenna pattern can be interrupted, and a radio wave can be transmitted / received with directivity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a radio communication device according to an embodiment of the present invention will be described in detail with reference to the drawings. (1) Embodiment FIG. 1 is a perspective view showing a configuration example of a wireless communication device 100 according to an embodiment of the present invention. In this embodiment, a shielding member is provided on the antenna mounting substrate side of the surface facing the antenna pattern of the antenna device, so that a radio wave from the antenna pattern toward the substrate can be shielded. In addition to enabling transmission and reception of radio waves with good directivity, when the radio communication device is applied to a mobile phone or the like, the radio waves can be shielded particularly in the direction of the user's head.

A wireless communication device 100 shown in FIG. 1 has a wiring board 1 as an example of a board. This wiring board 1
This is for mounting an antenna device for transmitting a radio wave. The wiring board 1 is made of an organic resin-based insulating material such as a glass epoxy prepreg.
It is about 0 mm x 20 mm wide x 1 mm thick. The wiring board 1 is provided with a wiring pattern 3 for feeding power to the antenna device. The wiring pattern 3 is made of a conductive material such as copper, for example, and has a line width of 250 μm,
The thickness is about 50 μm.

[0010] The wireless communication device 100 has a chip antenna device 50 for transmission, which is an example of an antenna device. The transmitting chip antenna device 50 has a predetermined antenna pattern shape and is mounted at the antenna mounting position 5 of the wiring board 1. The chip antenna device 50 will be described below.

The chip antenna device 50 shown in FIG.
have. The base 21 supports a conductor and an electrode on its upper surface or side surface. The base 21 is made of, for example, an organic resin-based insulator obtained by combining glass fiber and epoxy resin. Further, in order to enhance the adhesion between the base 21 and the conductor and the electrode, at least the surface of the base 21 immediately below the conductor and the electrode is made rough in an uneven shape.
The size of the base 21 is, for example, 5 mm long × 2.5 mm wide.
× Height is about 1 mm.

Further, the chip antenna device 50 has a conductor 23 provided on the upper surface of the base 21 with a predetermined antenna pattern shape. The conductor 23 is an antenna body of the chip antenna device 50 and has, for example, a loop antenna shape. The conductor 23 is made of a conductive material such as copper, and has a line width of 250 μm,
The thickness is about 50 μm.

Further, the chip antenna device 50 has electrodes 25A and 25B for feeding power to the conductor 23. The electrodes 25A and 25B are drawn from feed points 27A and 27B corresponding to the transmission frequency of the device 100, and are connected to the wiring pattern 3 of the wiring board 1. The electrodes 25A and 25B are made of a conductive material such as copper, and have a size of, for example, a line width of 250 μm and a thickness of 50 μm.
m.

The wireless communication device 100 shown in FIG. 1 has a shielding member 30 provided on the wiring board 1 on the surface of the chip antenna device 50 facing the conductor 23. In FIG. 1, the shielding member 30 is provided on the back surface of the wiring board 1 facing the antenna mounting position 5 of the wiring board 1.
Thereby, the radio wave radiated from the conductor 23 toward the wiring board 1 can be shielded by the shielding member 30.

The shielding member 30 is placed on the antenna mounting position 5 where the chip antenna device 50 is mounted, or on the base 21 of the chip antenna device 50 facing the conductor 23.
It may be attached to the back of. In these cases, too, the conductor 2
The radio wave radiated from 3 toward the wiring board 1 can be shielded by the shielding member 30.

FIG. 2 shows a wireless communication device 100 according to the present invention.
FIG. 3 is a block diagram illustrating a configuration example of FIG. Wireless communication device 100
Is, in addition to the transmission chip antenna device 50 described above,
It has a chip antenna device 60 for reception. The wireless communication device 100 includes two chip antenna devices having different resonance frequencies in order to prevent interference between transmission and reception radio waves. For example, the frequency for transmission is 795M
Hz, and the frequency for reception is 805 MHz.

Similar to the transmitting chip antenna device 50, the receiving chip antenna device 60 includes a base made of an organic resin-based insulator, a loop antenna-shaped conductor provided on the base, It has an electrode pulled out of the body and is mounted at a predetermined position on the wiring board 1. The conductor of the chip antenna device 60 is, for example, 805 MHz.
It resonates with a radio wave.

Further, a shielding member is provided on the back surface of the wiring board 1 facing the mounting position of the chip antenna device 60. This shielding member has the same configuration as the shielding member 30. Therefore, the receiving radio wave radiated from the wiring board 1 toward the chip antenna device 60 can be shielded.

Further, the wireless communication device 100 has a transmitting / receiving device 55 for transmitting and receiving an electric signal having a predetermined frequency. The transmitting / receiving device 55 includes, for example, a transmitting device 56 that transmits an electric signal having a frequency of 795 MHz to the transmitting chip antenna device 50 and a receiving device 57 that receives an 805 MHz electric signal from the receiving chip antenna device 60. It is configured.

The wireless communication device 100 has a selector circuit 62 between the transmitting / receiving device 55 and the two chip antenna devices. The selector circuit 62 selectively connects the transmitting device 56 and the chip antenna device 50 or the receiving device 57 and the chip antenna device 60 according to transmission and reception of the device 100.

As described above, the wireless communication device 1 according to the present invention
According to 00, the shielding member 30 is provided on the back surface of the wiring board 1 so as to face the antenna mounting position 5 of the wiring board 1 on which the chip antenna device 50 is mounted. Therefore,
Conductor 2, which is the antenna body of chip antenna device 50
3 can block radio waves radiated in the direction of the wiring board 1.

As a result, radio waves can be transmitted and received with better directivity as compared with the related art. When the wireless communication device 100 is applied to a mobile phone or the like, a shielding member can be interposed between the chip antenna device 50 and the head when the mobile phone is brought close to the head of the user. The radio wave in the direction of the head of the person can be shielded, and anxiety about health due to the use of the mobile phone can be reduced.

In this embodiment, as an example of the antenna device, the chip antenna device 50 having a loop antenna pattern shape is shown, but the present invention is not limited to this. For example, as shown in FIG. 3, an I-type conductor 82 is provided on a base 81, and an opening 8 is formed at a predetermined position of the conductor 82.
4 are provided, and the electrodes 83 are formed along the side walls of the opening 84.
May be used.

(2) First Embodiment FIG. 4 shows a wireless communication device 20 according to a first embodiment of the present invention.
FIG. 3 is a perspective view illustrating a configuration example of a No. 0 shielding member 40. In this embodiment, the shielding member 40 with the back surface short-circuiting pattern, which is an example of the shielding member of the wireless communication device 200, is provided with the conductor 3
It is assumed that a chip antenna device having a short circuit 2 is used and this shielding member 40 is provided on the back surface of the wiring board 1 facing the antenna mounting position 5 of the wiring board 1. Other configurations are the same as those of the wireless communication device 100 described in the embodiment. Therefore, components having the same reference numerals as those of the embodiment have the same configuration and function, and the description thereof will be omitted.

The shielding member 40 shown in FIG. 4 has a base 21 made of an organic resin-based insulator. The base 21 supports the short-circuited conductor, and is the same as the base of the chip antenna device 50 shown in FIG.

The shielding member 40 has the short-circuited conductor 23 on the upper surface of the base 21. This conductor 23
Is the same as the conductor included in the chip antenna device 50 shown in FIG. 1, and has a short circuit between the feeding points 27A and 27B by soldering or the like.

As shown in FIG. 5, the shielding member 40 described above is used.
Is provided on the back side of the antenna mounting position 5 of the wiring board 1 so that the short-circuited conductor 23 faces downward and the conductor 23 of the chip antenna device 50. As a result, the same component is used for the chip antenna device 50 and the shielding member 40, and the antenna feeding point of the shielding member 40 is short-circuited (electromotive force is 0 V).
The radio wave radiated from the 0 conductor 23 toward the wiring board 1 can be canceled.

As described above, according to the wireless communication device 200 according to the first embodiment of the present invention, the feeding points 27A and 27B
The shielding member 40 having the conductor 33 whose is short-circuited is provided on the back surface of the wiring board 1 so as to face the conductor 23 of the chip antenna device 50. Therefore,
The radio wave radiated from the conductor 23 toward the wiring board 1 can be blocked, and the radio wave can be transmitted upward with high directivity.

In this embodiment, a short-circuited loop antenna pattern is shown as an example of a conductor included in the shielding member. However, the present invention is not limited to this, and a rectangular copper foil pattern may be used. . Furthermore, when the chip antenna device 80 having the I-type conductor 82 shown in FIG. 3 is provided as the antenna device of the wireless communication device 200, the chip antenna device with the conductor 82 grounded is used for the shielding member 40. Just do it.

(3) Second Embodiment FIGS. 6 to 8 are plan views showing configuration examples (parts 1 to 3) of a wireless communication device 300 according to a second embodiment of the present invention.
In this embodiment, a case is used in which a copper plate 75 is used as an example of a shielding member of the wireless communication device 300, and the copper plate 75 is provided on the wiring board 1 side of the surface of the chip antenna device 50 facing the conductor 23 and grounded. Suppose. Other configurations are the same as those of the wireless communication device 100 described in the embodiment. Therefore, components having the same reference numerals as those of the embodiment have the same configuration and function, and the description thereof will be omitted.

As shown in FIG. 6, the wireless communication device 300 has a copper plate 75 as an example of a shielding member. The copper plate 75 shields a radio wave radiated from the conductor 23 toward the wiring board 1. The copper plate 75 is provided on the back side of the antenna mounting position 5 on the wiring board 1 so as to face the conductor 23 of the chip antenna device 50.

The copper plate 75 is made of, for example, a copper foil
And a resist pattern having a predetermined shape is formed on the copper foil, and thereafter, etching is performed using the resist pattern as a mask. The copper plate 75 has the same area as the antenna mounting position 5, and the size is, for example, 5 mm long × 2.5 mm wide ×
The thickness is about 100 μm. The copper plate 75 is joined to a wiring member (not shown) to be grounded. Therefore, the radio wave radiated from the conductor 23 toward the wiring board 1 can be shielded.

The wireless communication device 300 shown in FIG.
5 is provided on the antenna mounting position 5 of the wiring board 1. In this case, the copper plate 7 having a predetermined shape
5 can be formed together with the wiring pattern 3 of the wiring board 1. Therefore, as compared with the case where the copper plate 75 is provided on the back surface of the wiring board 1, the manufacturing process can be shortened, and the manufacturing cost can be reliably reduced.

Further, the radio communication device 300 shown in FIG.
Is such that a copper plate 75 is provided on the bottom surface 29 of the base 21. Since the copper plate 75 is provided on the bottom surface 29 facing the conductor 23, for example, even if the chip antenna device 50 is mounted at a position shifted from the antenna mounting position 5, the radio wave radiated in the direction of the wiring board 1 Can be reliably shielded.

As described above, the wireless communication device 3 according to the present invention
According to 00, the copper plate 75 is provided so as to be grounded on the side of the wiring board 1 on the surface facing the conductor 23. Therefore, the radio wave radiated from the conductor 23 toward the wiring board 1 can be shielded.

[0036]

According to the radio communication device of the present invention, the shielding member is provided on the antenna mounting substrate side of the surface of the antenna device facing the antenna pattern. With this configuration, the radiation of the radio wave from the antenna pattern toward the substrate can be blocked by the shielding member.

Therefore, radio waves can be transmitted and received with better directivity as compared with the related art. Further, when the antenna device is applied to a mobile phone or the like, when the mobile phone is brought close to the head of the user, a shielding member can be interposed between the antenna pattern and the head. The radio wave in the direction of the head can be shielded, and anxiety about health due to the use of the mobile phone can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration example of a wireless communication device 100 according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a wireless communication device 100.

FIG. 3 is a perspective view showing a configuration example of a chip antenna device 80 as an example of the antenna device.

FIG. 4 is a perspective view showing a configuration example of a shielding member 40 which is an example of a shielding member.

FIG. 5 is a wireless communication device 20 according to the first embodiment of the present invention.
It is a side view which shows the example of a structure of No. 0.

FIG. 6 shows a wireless communication device 30 according to a second embodiment of the present invention.
It is a side view which shows the example of a structure (No. 1) of No. 0.

FIG. 7 is a side view showing a configuration example (part 2) of the wireless communication device 300.

FIG. 8 is a side view showing a configuration example (part 3) of the wireless communication device 300.

FIG. 9 is a perspective view illustrating a configuration example of a wireless communication device 90 according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 3 Wiring pattern 5 Antenna mounting position 21 Base 23 Conductor 30, 40 Shielding member 50 Chip antenna device 100, 200, 300 Wireless communication equipment

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04M 1/02 H04M 1/02

Claims (5)

[Claims] 1. A wireless communication device for transmitting and receiving a radio wave, comprising: a substrate for mounting an antenna; an antenna device having an antenna pattern of a predetermined shape and mounted at a predetermined position on the substrate; and an antenna pattern of the antenna device. And a shielding member provided on the side of the substrate facing the substrate. 2. The wireless communication apparatus according to claim 1, wherein the shielding member is provided on a surface of the antenna device facing the antenna pattern of the antenna device on the substrate side. 3. The wireless communication device according to claim 1, wherein the shielding member is provided on the substrate including a mounting position of the antenna device. 4. The wireless communication device according to claim 1, wherein the shielding member is provided on a back surface of the substrate facing a mounting position of the antenna device. 5. The wireless communication device according to claim 4, wherein the shielding member includes the antenna device whose antenna feeding point is short-circuited or grounded.