JPH11340867A - Portable radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of induced currents at a conductive part, and to improve antenna sensitivity and directivity by conducting a conductive part which constitutes a case body on a ground face on a circuit board near an antenna power feeding point. SOLUTION: A case body is constituted of a metallic front case 1 and a resin rear case 3, so that strength can be maintained at the time of making the case body small in size and thin in thickness, and requirement for design can be satisfied. A contactor 4 for conducting a front case is arranged on a ground face 6 on a circuit board near an antenna power feeding point 5, and the contactor 4 is connected to a site 1a of the metallic front case 1. Then, the metallic front case 1 is conducted with the ground face 6, and ground currents making a pair with currents flowing from the antenna power feeding point 5 to an antenna 7 are guided to the metallic front case 1. Thus, metallic front case 1 functions as a radiating element, and the generation of induced currents at the metallic front case 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio communication device in which a housing is entirely or partially made of a conductive material.

[0002]

2. Description of the Related Art Conventionally, a portable radio communication device has to use a casing part or all of which is made of metal or the like in order to maintain the strength of the casing at the time of miniaturization and thinning, and to meet design requirements. Was. FIG. 2 shows a conventional example of a portable radio communication device, in which a housing is constituted by a metal front case 1 and a resin rear case 3. The circuit board 2 is housed in a resin rear case 3. The antenna 7 is connected to an antenna feed point 5 on the internal circuit board 2 through an antenna mounting hole 8 opened on the top surface of the resin rear case 3. 6 is a ground plane on the circuit board.

[0003]

However, in the prior art, a current is induced in the conductive material constituting the whole or a part of the housing by the frequency of the radio wave used, and the electric current of the antenna formed in the main body circuit is increased. There is a problem that the gain is reduced.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems of the prior art, and a conductive part constituting all or a part of a housing is replaced with a circuit board near an antenna feeding point. Provided is a portable wireless communication device having an improved antenna gain by conducting to an upper ground plane, using a conductive portion of a housing as a radiating element, and preventing an induced current from being induced in the conductive portion.

[0005]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention.
In the figure, the same parts as those of the above-described conventional example shown in FIG. 2 are denoted by the same reference numerals, and in the figure, 1 is a metal front case, 2 is a circuit board, 3 is a resin rear case, 4 is a metal contact, 5 is an antenna feed on a circuit board. Point, 6 is the ground plane on the circuit board,
7 is an antenna.

A metal contact 4 is arranged on a ground plane 6 near the antenna feed point 5, and the contact 4 is connected to the portion 1 a of the metal front case 1. As a result, the metal front case 1 is electrically connected to the ground surface 6, and a ground current that is paired with a current flowing from the feeding point 5 to the antenna 7 is guided to the metal front case 1, and the metal front case 1 radiates. In addition to functioning as an element, generation of an induced current in the metal front case 1 is prevented.

[0008]

As described above, according to the structure of the present invention, it is possible to prevent an induced current from being generated in the conductive portion constituting the whole or a part of the housing, and further to make the conductive portion positive. The antenna sensitivity and directivity can be improved by using it as a part of the radiating element.

[Brief description of the drawings]

FIG. 1 is a schematic view of a portable wireless communication apparatus according to an embodiment of the present invention, in which a metal front case is electrically connected to a ground plane near an antenna feed point on a circuit board.

FIG. 2 shows a metal front case according to the related art;
5 is a schematic diagram of a portable wireless communication device showing a conventional example arranged without conducting to a ground on a circuit board.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 metal front case 2 circuit board 3 resin rear case 4 front case conduction contact 5 antenna feed point 6 ground plane on circuit board 7 antenna 8 antenna mounting hole

Claims (1)

[Claims] In a portable radio communication device in which all or a part of a housing is made of a conductive material, the conductive portion of the housing is connected to a ground of a circuit board near an antenna feeding point. A portable wireless communication device.