JP2000183635A - Portable telephone set with cross antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a product of a portable telephone terminal, whose communication sensitivity is improved by means of an antenna and its ancillary structure where effects on the brain of a user due to an electromagnetic wave emitted from the portable telephone terminal is reduced. SOLUTION: In this portable telephone terminal with a cross antenna, an open and close type board (1) is connected to an upper part of the portable telephone terminal. Then the type of material of the board (1) is mainly a polymer such as a plastic. Then a cross antenna (2) is built in the inside of the board (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form of an antenna for improving the sensitivity of a portable telephone and an attached structure thereof.

[0002]

2. Description of the Related Art Conventionally, a pole antenna is mainly used for radio waves used for communication of a portable telephone, because a vertically polarized wave is used.

[0003]

Taking a Japanese mobile phone as an example, a PHS and an automobile mobile phone are the mainstream, and there are other satellite mobile phones. Satellite mobile phones are still very expensive, so it is far from being used by the general public. Also, satellite mobile phones have a large transmission power, so there is a concern that they may affect the human body. And mobile phones are not without the problem of electromagnetic waves. Also, since the PHS has a lower transmission power than the above two mobile phones, there is no need to worry about the influence on the human body, but it is not so good in terms of communication sensitivity. If possible, it is best to have low transmission power and good communication sensitivity. In addition, since the current mobile phone performs transmission and reception with one antenna, the voice of the other party may be difficult to hear due to a slight time lag or fading phenomenon.

[0004]

In order to solve the above-mentioned problems, a use of a cross antenna as an antenna of a portable telephone was considered. When the transmission power is kept constant except for the frequency, circular polarization seems to be better than vertical polarization used by Japanese PHS and car mobile phones to improve communication sensitivity. As for communication using optical fibers, some companies are conducting research using circularly polarized wave transmission. At the University of Electro-Communications, we are studying transmission using circular polarization to eliminate the radio fading phenomenon. Also, even in an urban area where buildings are scattered, it is difficult for the radio waves to directly reach from the base station to the mobile phone terminal. Even in such an environment, circular polarization has higher sensitivity. Circularly polarized antennas include an orthogonal dipole antenna and a circularly polarized rectangular patch antenna. In addition, one circularly polarized patch antenna is provided on the antenna plate with the feeding point shifted from the center first.
Circular polarization can be emitted by providing another feeding point at a position rotated by 0 degrees. Then, in addition to the above-described cross antenna, a cross antenna between vertical polarization and circular polarization was considered. First, this idea is an antenna for vertical polarization. One of the cross antennas is used for transmission, and the other is used as a reception antenna. I wonder if it would be better to place the two antennas in parallel, but that is not the case. The best way to catch vertical polarization is to raise the antenna vertically. However, as described above, the vertical polarization may enter the antenna in a tilted state due to various situations. Therefore, what to do will be described using two pole antennas. Crossing pole antennas is the same, but crossing angles are different. Roughly, it is about 20 to 50 degrees at a narrower angle. If the angle is 40 °, half of the line is the line of the vertical polarization reception / transmission angle. Since the pole antennas are close to each other, they resonate with each other. The transmission / reception angle range is widened. In the case of a patch antenna as well, one feed may be transmitted and the other may be received, and the angle may be changed from 20 ° to 50 °. When these are actually used for an antenna of a mobile phone, it is best to hold them with a polymer such as plastic or the like, form them into a plate shape, and connect them to a mobile phone terminal in terms of functionality and durability. In addition, in this case, the upper part of the mobile phone is good, but the lower part is also good considering the effect of electromagnetic waves on the head. It is also conceivable that two pairs of circularly polarized cross antennas are used, one for transmission and the other for reception. However, in this case, a pole antenna is good.

[0005]

The mobile phone is used by opening and closing the openable plate (1). In addition, a mechanism that can be locked when fully opened or completely closed.

[0006]

[Embodiment 1] First, a circularly polarized antenna with good communication sensitivity and an openable / closable plate (1) with an attached structure accompanying its installation
Will be described with reference to FIG. 1 and FIG. FIG. 1 shows an antenna in which rod-shaped conductors cross each other. For example, two dipole antennas cross each other at right angles. Of course, it is powered because it is an antenna. The cross antenna (2) is held by a plate made of a polymer such as plastic. However,
I think that it is easier to resonate if there is some space between the antenna and the polymer, because they are not completely adhered. And that part is an openable / closable plate (1). The openable plate (1) is connected to the main body of the mobile phone by a hinge (3). The hinge (3) is structured so that it can be locked when it is completely opened and when it is closed. (4) is a speaker, and (5) is a liquid crystal display. And the microphone is (6). In (7), a hole is formed in the openable / closable plate (1) so that a ringing sound from the speaker (4) can pass through. The hole (7) may be covered with a waterproof cloth. If air can penetrate, sound should pass. (8) is a code. The openable plate (1) in this figure is made of a transparent material so that the inside can be easily described. In the following description, the openable plate (1) is made of a transparent material. FIG. 2 is a view showing a state in which the openable plate (1) is closed. Also,

In the above description, the plate-shaped antenna is described as a circularly-polarized rectangular patch antenna, but if there is no ground plate, omnidirectionality increases because only one conductor plate is used as the antenna. This is a form in which three feeding points are provided and the cord (8) is connected. FIG. 3 shows one of the cross antennas (2) as a transmitting antenna (9) and the other as a receiving antenna (1).
0). Then, the narrow angle formed by crossing was set to 40 °. Also, I think that a circular plate antenna is good for doing this with a plate antenna. In addition, the reason why the direction of the antenna is inclined at about 45 ° in FIGS. 1, 2 and 3 is that most of the people who hold and use the mobile phone at an angle during the conversation of the mobile phone are intentionally made in this manner. Also,
I think this is better because the speaker (4) moves away from the antenna. However, one of the antennas may be perpendicular to the mobile phone.

[0007]

[Embodiment 2] In this embodiment, the openable plate (1) having the above-mentioned contents is connected to the lower part of a portable telephone.
This shape can reduce the effect of electromagnetic waves on the head of the human body. The reason is that the antenna position is close to the ear in the upper part. The most problematic effect of the electromagnetic wave is the effect on the brain, and the electromagnetic wave is easy to enter from the ear, so it is better to attach the antenna to the lower part.
However, conventional mobile phone antennas have a pole antenna as it is, so it is easier to use it if it is mounted on the usage pattern. With this idea, it is easy to use even if it is attached below. In addition, the cross antenna (2) in FIG. 4 is described using the orthogonal dipole antenna. Other antennas may be used as long as they have the contents shown in the first embodiment. However, in the case of a pole antenna, the microphone (4) can be installed on the openable plate (1) as shown in the figure. In the case of a plate-like antenna, there is a possibility that the microphone (4) picks up a reception wave or a transmission wave and sends it to an internal circuit. Also, it is better to cover only the area around the microphone (4) with a substance mixed with fine particles of a substance that absorbs electromagnetic waves. For example, charcoal fine particles fired at 800 ° C. or more are mixed into a polymer or the like, and the front portion is an open-shaped product. FIG. 5 shows a plate-shaped circularly polarized antenna. Further, a shape in which the antenna portion of FIG. 3 is set at the lower portion is a good shape, though not drawn.

[0008]

Embodiment 3 This embodiment is an idea of an orthogonal pole antenna for circular polarization only. I don't think any other type of antenna can be effective. The contents are such that two pairs of orthogonal pole antennas are set at a slightly different angle from one central point. The pair of cross antennas (2) is used as a transmission antenna (11) and the other pair of cross antennas (2) is used as a reception antenna (12). However, it is OK to install another pair of cross antennas (2) directly above, but since they must be spaced apart from each other to some extent, the openable and closable plate (1)
In this case, the angle of the cross antenna (2) is shifted on the same axis as the cross antenna (2), but the transmitting antenna (11) is on the front side as viewed in the figure, and the receiving antenna (12) is on the rear side. I think that the sensitivity of the antenna is better if it is installed on the side. In the figure, the installation form of the orthogonal dipole antenna is described. In addition, in order to perform communication of a mobile phone by circularly polarized waves, it is necessary to design a circuit and a circuit of a terminal of the mobile phone in accordance with the circuit. In addition, in order to perform reception and transmission using different antennas, the current circuit design of a mobile phone must be changed. Further, in order to communicate a mobile phone with circularly polarized waves, not only the terminal but also various facilities of the telephone company must be changed correspondingly.

[0009]

As described above, the communication sensitivity of the mobile phone is improved, and the influence of the electromagnetic wave on the brain can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a perspective view of the first embodiment.

FIG. 3 is a perspective view of the first embodiment.

FIG. 4 is a perspective view of a second embodiment.

FIG. 5 is a perspective view of a second embodiment.

FIG. 6 is a perspective view of a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Openable-closing board 2 Cross antenna 3 Hinge 4 Speaker 5 Liquid crystal display part 6 Microphone 7 Hole 8 Code 9 Transmitting antenna for vertical polarization 10 Receiving antenna for vertical polarization 11 Transmitting antenna for circular polarization 12 Receiving antenna for circular polarization

Claims (3)

[Claims] The present invention relates to a mobile phone terminal provided with a cross antenna. It is a form in which an openable plate (1) is connected to the upper part of a mobile phone. The material of the surface is mainly made of a polymer such as plastic. A mobile phone with a cross antenna, wherein a cross antenna (2) is built in the inside. 2. The mobile phone with a cross antenna according to claim 1, wherein the openable and closable plate (1) is connected to a lower portion of the mobile phone. 3. The mobile phone with a cross antenna according to claim 1, wherein a plurality of cross antennas (2) are incorporated inside the openable plate (1).