JP3272650B2 - Mobile communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device having a built-in antenna.

[0002]

2. Description of the Related Art Currently, transceivers, portable radios, P
2. Description of the Related Art Mobile communication devices typified by HS and mobile phones are widely used as information transmission means. As shown in FIG. 3A, a mobile phone generally used as a mobile communication device has a non-directional whip antenna 32 protrudingly mounted above the mobile phone 31 to transmit and receive radio waves 33 from the whip antenna. It is carried out. Some high-frequency devices such as PHS have a built-in antenna by attaching a loop antenna to the end of a built-in printed circuit board, but the antenna is non-directional. Other mobile communication devices also have basically the same structure.

[0003] Since the whip antenna used in the mobile communication device is non-directional, a radio wave 33 is also radiated to the human body 34 as shown in FIG. Here, there is a report that the radio wave 33 has an adverse effect on the human body 34. In particular, it is said that a high-power mobile communication device has a large effect on the human body 34.

[0004] These mobile communication devices are not considered to have a remarkable temperature rise as much as the thermal effect of radio waves used for thermotherapy or the like, but there are reports that changes in the functions and behaviors of living bodies are recognized. The effect of radio waves is considered as a non-thermal effect separately from the thermal effect.

A mobile communication device taking measures for solving such a problem is disclosed in Japanese Patent Application Laid-Open No. Hei 7-111411. This is one in which a chip antenna is built in the mobile communication device, and a means for attenuating the transmission output in the direction of the human body is provided. Specifically, a chip antenna is mounted on a printed circuit board, a ground pattern is provided on the printed circuit board disposed between the chip antenna and a human body, and the transmission output in the direction of the human body is attenuated by the shielding effect of the ground pattern.

However, since a wiring pattern and a ground pattern are generally provided on a printed circuit board, it is difficult to make the entire surface of the printed circuit board a ground pattern, and the shielding effect of the ground pattern provided on the printed circuit board alone is not sufficient. Leakage occurred, the attenuation of radio wave transmission output toward the human body was not sufficient, and the effect on the human body could not be avoided.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a mobile communication device in which radio waves do not adversely affect the human body. I do.

[0008]

The present invention has been made to solve the above-mentioned problems, and comprises the following means. In the mobile communication device according to the present invention, a radio wave reflection layer that blocks radio waves from the chip antenna in the housing toward the human body and reflects external radio waves to converge on the chip antenna is provided on the inner surface of the housing. It is a thing.

Further, the radio wave reflection layer may be provided by coating or vapor deposition on the inner surface of the housing. Further, the radio wave reflection layer is preferably made of Cu, Ni, Ag, Au, Pd or an alloy thereof. Furthermore, the inner surface of the housing has a curved surface shape that reflects radio waves from the outside and focuses and converges on the chip antenna, and at least a part of the radio wave reflecting layer is provided on the inner surface of the curved housing. It is still preferred.

In another aspect of the present invention, a mobile communication device includes a radio wave reflecting means for reflecting a radio wave from a chip antenna in a housing toward a human body in a housing, and the radio wave reflecting means comprises: It has a curved surface shape that reflects radio waves from the outside and focuses and converges it on the chip antenna.

In such a mobile communication device, it is preferable that the radio wave reflecting means is made of Cu, Ni, Ag, Au, Pd or an alloy thereof. Further, the radio wave reflecting means may be provided in a part of the housing. Still further, it is more preferable that the radio wave reflecting means is provided by being applied or vapor-deposited on the housing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A chip antenna is provided in a housing of a mobile communication device to block radio wave radiation in the direction of the human body to reduce adverse effects on the human body. This is achieved by providing a radio wave reflection layer made of Cu, Ni, Ag, Au, Pd or an alloy thereof at least in a part of the housing and at least a part between the human body and the chip antenna. .

Further, by forming a part of the housing provided with the radio wave reflecting layer into a curved surface so that the received radio wave is reflected on the radio wave reflecting layer and converges on the chip antenna, the directivity of the antenna is enhanced and the body direction is improved. In addition to reducing the radiation of radio waves to the body, the directivity to parts other than the human body is enhanced and weak radio waves can be received.

The radio wave reflecting layer is desirably formed by coating or vapor deposition, but it is apparent that there is no particular need to specify the radio wave reflecting layer as long as it can form the radio wave reflecting layer.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mobile communication device according to the present invention, for example, a portable telephone will be described below with reference to the drawings.

FIG. 1A is a conceptual diagram of a mobile communication device according to the present invention.

Printed circuit board 3 provided inside housing 2
The chip antenna 1 is installed on the part 2a of the housing located between the chip antenna 1 and the human body 5.
By reflecting a part of the radio wave 4 output from the radio wave, the radio wave radiation toward the human body due to the radio wave is reduced.

FIG. 1B is an explanatory view of a mechanism for reflecting a part of the radio wave 4 on a part 2a of the housing.

The radio wave reflecting layer 6 is provided on a part 2a of the housing located between the chip antenna 1 and the human body 5 mounted on the printed circuit board 3, and the part 2a of the housing provided with the radio wave reflecting layer 6 is provided. Is formed into a curved surface, a part 4a of the radiated radio wave is directly radiated into the air, and the other radio wave 4b is reflected by the radio wave reflection layer 6 and radiated into the air. Therefore, the radio wave radiated in the direction of the human body 5 is significantly reduced, and the influence on the human body is reduced. Further, since the radio waves are reflected by the radio wave reflection layer 6 and radiated in directions other than the human body, the radio waves output in directions other than the human body are large.

The solid line 7 in FIG. 2 shows the output characteristics of the chip antenna 1 on the printed circuit board 3 installed near the part 2a of the housing provided with the radio wave reflection layer 6. A broken line 8 indicates the output characteristics of a whip antenna generally provided in a conventional mobile communication device.

A conventional mobile communication device equipped with a whip antenna is omnidirectional and, therefore, inevitably affects the human body. However, a mobile communication device provided with a radio wave reflection layer 6 on a part 2a of a housing is not used. It can be seen that the radio wave output in the direction of the radio wave reflection layer 6 is remarkably reduced, and the influence on the human body 5 is small.

A part 2 of the housing provided with the radio wave reflecting layer 6
Since a is a curved surface, even a radio wave that is not directly input to the chip antenna 1 is reflected on the radio wave reflection layer 6 and input to the chip antenna 1, so that the antenna sensitivity is increased. Here, it is possible to radiate a radio wave in an arbitrary direction by changing the curved surface of a part 2a of the housing provided with the radio wave reflection layer 6, but it is necessary to configure the focus on the chip antenna. Is desirable.

The radio wave reflection layer 6 is not particularly specified as long as it has the ability to reflect radio waves.
It is desirable to use Au, Pd, or an alloy thereof, and it is desirable to form them by vapor deposition or coating.

[0024]

According to the present invention, it is possible to provide a mobile communication device which does not adversely affect the human body due to radio waves and has high radio wave reception sensitivity.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a mobile communication device according to the present invention.

FIG. 2 is a diagram showing characteristics of the mobile communication device according to the present invention.

FIG. 3 is a diagram showing a conventional mobile communication device.

[Explanation of symbols]

 Reference Signs List 1 chip antenna 2 housing 3 printed circuit board 4 radio wave 5 human body 6 radio wave reflection layer

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/38 H01Q 1/24 H01Q 19/10 H05K 9/00

Claims (5)

(57) [Claims] 1. A radio wave reflection means for reflecting radio waves from a chip antenna in a housing toward a human body is provided in the housing, and the radio wave reflection means reflects radio waves from outside to the chip antenna. A mobile communication device having a curved surface shape for enhancing convergence. 2. The mobile communication device according to claim 1, wherein said radio wave reflection means is provided in a part of said housing. 3. The mobile communication device according to claim 2, wherein said radio wave reflection means is a radio wave reflection layer. 4. The radio wave reflecting means includes Cu, Ni, Ag,
4. The mobile communication device according to claim 1, wherein the mobile communication device is made of Au, Pd, or an alloy thereof. 5. The mobile communication device according to claim 1, wherein said radio wave reflecting means is provided by applying or vapor-depositing said casing.