JPH11289272A - Portable radio wave device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the leakage of transmitted radio waves to a receiver or a digital signal processor by arranging a transmitter on a 1st plane face of a circuit board and arranging the receiver on a 2nd plane face of the circuit board. SOLUTION: A transmitter 1 is arranged on one plane face of a circuit board 5 and a receiver 2 and a digital signal processor 3 are arranged on the other plane face. Although one antenna is used as both a transmitting antenna and a receiving antenna in many cases, when there are transmitting and receiving antennas separately in particular, it is preferable to separately arrange them on the surface plane and the rear plane of the board 5. Furthermore, it is desirable to separately arrange the clock generation circuit of the transmitter and the clock generation circuit of the receiver of the surface plane and the rear plane of the board 5. Thus, a shield box is not needed any more and the weight and the space volume of a terminal device can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio wave device for transmitting radio waves, such as a mobile phone or a portable information terminal, in which a transmitted radio wave does not leak into a receiving device or a digital signal processing device. The present invention relates to a shield of a portable radio device for performing the operation.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a configuration of a circuit board 5 of a conventional portable radio device. 1 is a transmitting device, 2 is a receiving device, 3 is a digital signal processing device, 4 is a shield box, and 5 is a circuit board. FIG. 7 is a cross-sectional view when the circuit board 5 configured in FIG. 6 is attached to a case of a portable radio device. 6 is a case. In the case of a portable radio device, a shield box 4 is provided to prevent the signal from passing from a transmitting device 1 such as a transmitter or a transmitting antenna to a receiving device 2 such as a receiver or a receiving antenna or a digital signal processing device 3. The shield box 4 is usually made of metal.

[0003]

In the conventional configuration, in order to prevent the signal from sneaking into the receiving device 2 or the digital signal processing device 3 from the transmitting device 1, the shield box 4 must have a sufficient size and thickness. Must be
There was a problem that the weight and the capacity of the terminal increased.

An object of the present invention is to provide a portable radio device capable of preventing a signal from flowing from the transmitting device 1 to the receiving device 2 or the digital signal processing device 3 even if the shield box 4 is not provided or is simple. And It is another object of the present invention to provide a portable radio device capable of reducing the weight and the capacity of a terminal.

[0005]

A portable radio device according to the present invention is a portable radio device having a transmitting device, a receiving device, and a circuit board. In the portable radio device, the transmitting device is arranged on a first surface of the circuit board, and the receiving device is provided. It is arranged on the second surface of the circuit board.

The portable radio device further comprises a digital signal processor on a second surface of the circuit board on which the receiving device is arranged.

[0007] The portable radio equipment further comprises a simple shield case for covering at least one of the receiving device and the digital signal processing device.

[0008] The portable radio device further comprises a case coated with a metal so as to cover the second surface of the circuit board.

[0009] The portable radio device further comprises a case provided with a metal coating so as to cover a portion where the receiving device and the digital signal processing device are provided.

[0010] The portable radio device further comprises a shielding threshold plate near a portion where the receiving device and the digital signal processing device are provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a first embodiment of the present invention. FIG. 1 shows a circuit board 5 in which a transmitting device 1 is arranged on one surface and a receiving device 2 and a digital signal processing device 3 are arranged on the other surface. In many cases, a single antenna is used as both the transmitting antenna and the receiving antenna. In particular, when the transmitting antenna and the receiving antenna are provided separately, it is desirable to arrange them separately on the front surface and the back surface of the circuit board 5. Further, it is desirable that the amplifier circuit of the transmitter and the amplifier circuit of the receiver are separately arranged on the front surface and the back surface of the circuit board 5. Further, it is desirable that the clock generation circuit of the transmitter and the clock generation circuit of the receiver are also separately disposed on the front surface and the back surface of the circuit board 5. Unnecessary radio waves are less wrapped around the two surfaces than on the same plane, so the transmission device 1 can be provided without the shield box 4.
Therefore, the shield box 4 is not required since unnecessary radio waves can be prevented from sneaking into the receiver 2 or the digital signal processor 3. Therefore, the weight and the capacity of the terminal can be reduced. It is desirable that the receiving device 2 that is more susceptible to noise than the digital signal processing device 3 is provided on the side opposite to the transmitting device 1. The present invention is particularly effective when the size of the portable radio equipment becomes small and all the circuits must be arranged on one circuit board 5.

Embodiment 2 FIG. FIG. 2 shows a second embodiment of the present invention. FIG. 2 illustrates a simple shield box 4 in which the transmitting device 1 is arranged on one surface of the circuit board 5 and the receiving device 2 and the digital signal processing device 3 are arranged on the other surface.
Covers the receiving device 2 and the digital signal processing device 3 excluding the receiving antenna. This is effective in the case where it is not possible to sufficiently prevent the signal from flowing from the transmitting device 1 to the receiving device 2 or the digital signal processing device 3 in the first embodiment. Unnecessary radio waves are less wrapped around the two surfaces than on the same plane, so that the shield box 4 may be of a simpler type than in the conventional embodiment. For example, it is only necessary to provide a stitch or a metal coated only on a part of the surface, instead of the entire metal. The simple shield box 4 can reduce the weight and capacity as compared with the conventional shield box 4.

Embodiment 3 FIG. 3 shows a third embodiment of the present invention. FIG. 3 shows an arrangement in which the transmitting device 1 is arranged on one surface of the circuit board 5, the receiving device 2 and the digital signal processing device 3 are arranged on the other surface, and a metal coating 8 is applied inside the case 6 to form a receiving antenna. Except for the surface on which the receiving device 2 and the digital signal processing device 3 are provided. This is effective in the case where it is not possible to sufficiently prevent the signal from flowing from the transmitting device 1 to the receiving device 2 or the digital signal processing device 3 in the first embodiment. This example is a portable radio device in which a case 6 provided with a metal coating 8 on a case 6 without providing a shield box 4 is provided because unnecessary radio waves are less wrapped around the two surfaces than on the same plane. It is. The metal coating 8 can be simple and can reduce the weight and capacity as compared with the conventional shield box 4.

Embodiment 4 FIG. 4 shows a fourth embodiment of the present invention. FIG. 4 shows a receiving device in which a transmitting device 1 is arranged on one surface of a circuit board 5, a receiving device 2 and a digital signal processing device 3 are arranged on the other surface, and a part of a case 6 is coated with a metal coating 8. 2 or a part of the surface on which the digital signal processing device 3 is provided (however, a receiving antenna is excluded). This is effective in the case where it is not possible to sufficiently prevent the signal from flowing from the transmitting device 1 to the receiving device 2 or the digital signal processing device 3 in the first embodiment. In this example, an unnecessary radio wave is less wrapped around the two surfaces than on the same plane, so that a part of the case 6 provided with a metal coating 8 without providing the shield box 4 is provided. Portable radio equipment. This is effective when the place where the metal coating 8 is applied is limited depending on the arrangement of the display device and other components. The metal coating 8 can be simple and can reduce the weight and capacity as compared with the conventional shield box 4.

Embodiment 5 FIG. 5 shows a fifth embodiment of the present invention. FIG. 5 shows a receiving device in which a transmitting device 1 is arranged on one surface of a circuit board 5, a receiving device 2 and a digital signal processing device 3 are arranged on the other surface, and a metal coating 8 is applied to a part of a case 6. 2 or a part of the surface on which the digital signal processing device 3 is provided (excluding the receiving antenna). In addition, a threshold plate 9 is provided near a portion where the receiving device 2 and the digital signal processing device 3 are provided. For example, the position of the threshold plate 9 is
The end of the metal coating 8. This threshold plate 9 is a metal plate. Alternatively, a metal coated part or a dielectric plate may be used instead. This is effective in the case where it is not possible to sufficiently prevent the signal from flowing from the transmitting device 1 to the receiving device 2 or the digital signal processing device 3 in the first embodiment. Unnecessary radio waves are less wrapped around the two surfaces than on the same plane, so that the case 6 is provided with a metal coating 8 on a part of the case 6 without providing the shield box 4, and In order to sufficiently prevent signal wraparound, a threshold plate 9 is provided near the portion where the receiving device 2 and the digital signal processing device 3 are provided.
Is provided. This example is an embodiment in the case where the place where the metal coating 8 is applied is limited depending on the arrangement of the display device and other components. The metal coating 8 and the threshold plate 9 can be simple and can reduce the weight and capacity compared to the conventional shield box 4.

[0016]

According to the present invention, in a portable radio equipment having a transmitting device, a receiving device, and a digital signal processing device, the receiving device and the digital signal processing device are arranged on the back side of the circuit board on which the transmitting device is provided, so that transmission is performed. The transmitted radio wave does not leak into the receiving device or the digital signal processing device.

According to the present invention, in a portable radio device having a transmitting device, a receiving device, and a digital signal processing device,
The receiver and the digital signal processor are placed on the back side of the circuit board on which the transmitter is installed, and the receiver and the digital signal processor are covered by a simple shield case. It will not leak.

According to the present invention, in a portable radio device having a transmitting device, a receiving device, and a digital signal processing device,
Since the receiving device and the digital signal processing device are arranged on the back side of the circuit board on which the transmitting device is provided, and the entire area inside the case where the receiving device and the digital signal processing device are provided is coated with a metal coating, the transmitted radio wave is transmitted to the receiving device. Alternatively, it does not leak into the digital signal processing device.

According to the present invention, in a portable radio device having a transmitting device, a receiving device, and a digital signal processing device,
Since the receiver and digital signal processor are placed on the back side of the circuit board on which the transmitter is provided, and the metal coating is applied to the inside of the case where only the receiver and digital signal processor are provided, the transmitted radio waves are It does not leak into the receiving device or the digital signal processing device.

According to the present invention, in a portable radio device having a transmitting device, a receiving device, and a digital signal processing device,
The receiving device and the digital signal processing device are arranged on the back side of the circuit board on which the transmitting device is provided, and a metal coating is applied to the inside of the case where only the receiving device and the digital signal processing device are provided, and the receiving device and the digital signal are provided. Since a metal or dielectric threshold plate is inserted in the vicinity of the portion where the processing device is provided, the transmitted radio wave does not leak into the receiving device or the digital signal processing device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a conventional portable radio device.

FIG. 7 is a cross-sectional view of a conventional portable radio device.

[Explanation of symbols]

1 transmitting device, 2 receiving device, 3 digital signal processing device, 4 shield box, 5 circuit board, 6 case, 7 shield case, 8 metal coating, 9
Shiki board.

Claims (6)

[Claims] 1. A portable radio device having a transmitting device, a receiving device, and a circuit board, wherein the transmitting device is arranged on a first surface of the circuit board, and the receiving device is arranged on a second surface of the circuit board. Characteristic portable radio equipment. 2. The portable radio equipment according to claim 1, wherein said portable radio equipment further comprises a digital signal processing device on a second surface of a circuit board on which a receiving device is arranged. 3. The portable radio device according to claim 2, wherein the portable radio device further comprises a simple shield case that covers at least one of the receiving device and the digital signal processing device. 4. The portable radio device according to claim 1, further comprising a case coated with a metal coating so as to cover the second surface of the circuit board. 5. The portable radio wave device according to claim 2, wherein the portable radio device further comprises a case coated with a metal coating so as to cover a portion where the receiving device and the digital signal processing device are provided. machine. 6. The portable radio device according to claim 5, wherein the portable radio device further comprises a shielding threshold plate near a portion where the receiving device and the digital signal processing device are provided.