JP2002171112A - Mobile phone - Google Patents

Abstract

(57) [Summary] In a conventional portable wireless device, a built-in antenna is arranged at an upper end portion of a rear case. However, as the miniaturization progresses, when a user talks, the built-in antenna becomes closer to the ear and the radiation characteristic tends to deteriorate. In addition, since the width of the portable wireless device is becoming smaller, the distance from the whip antenna tends to be shorter, so that there is a problem that the correlation coefficient increases and the diversity effect at the time of reception decreases. In a portable wireless device according to the present invention, a quarter wavelength antenna is fixed to an inner wall at a lower end portion of a front case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless device using a built-in antenna, and preferably to a quarter.
The present invention relates to a portable wireless device using a built-in antenna having a wavelength line.

[0002]

2. Description of the Related Art FIG. 4 shows a portable radio having a built-in antenna.

FIG. 4 is a side sectional view. 1 is a rear case which is a rear part of the case, 2 is a front case which is a front part of the case, 3 is a meander line antenna made of thin sheet metal, 5 is a speaker, 6 is a microphone, 7 is an LCD, 8 is a circuit board,
Reference numeral 9 denotes a whip antenna that can be freely extended and stored, reference numeral 10 denotes a double-sided tape, reference numeral 11 denotes a power supply land, and reference numeral 12 denotes a battery.

[0004] The quarter wavelength line (meander line) antenna 3 is formed of a thin sheet metal (about 0.1 mm) made of a material such as phosphor bronze so as to receive a transmission radio wave from a base station. And 1/4 that resonates in the reception band
It has the electrical length of the wavelength. The power supply land 11 on the circuit board is connected to a receiving circuit (not shown) via a power supply line (not shown). The end 4 of the meander line antenna 3 has a spring structure, and contacts the power supply land 11 by pressure to maintain electrical conduction. The meander line antenna is fixed to the upper end 13 of the rear case with a double-sided tape 10.

[0005]

In recent years, due to the reduction in size, weight, and thickness of portable wireless devices, the tendency for the built-in antenna to be located close to the ear when a user talks has a tendency to deteriorate radiation characteristics. . In particular, because of its small size, when the user holds it in his hand, there is also a problem that a finger is placed near the position where the built-in antenna is disposed on the inner wall, and radiation characteristics are deteriorated. In addition, since the width of the portable wireless device has become smaller, the distance from the whip antenna tends to be shorter, and a problem has been pointed out that the correlation coefficient increases and the diversity effect at the time of reception decreases. .

[0006]

In order to solve the above-mentioned problems, in a portable telephone according to the present invention, a built-in antenna is directly fixed to an inner wall at a lower end portion of a front case.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In FIG. 1, (a) is a side sectional view, and (b) is a view of the front case viewed from the back. 1 is a rear case which is a rear part of the case, 2 is a front case which is a front part of the case, 3 is a meander line antenna made of thin sheet metal, 5 is a speaker, 6 is a microphone, 7 is an LCD, 8 is a circuit board,
9 is a whip antenna, 10 is a double-sided tape, 11 is a feeding land, and 12 is a battery. The front case 2 has a mouthpiece at a speaker position and a mouthpiece at a microphone position.

[0008] The antenna radiating element 3 is formed of a thin sheet metal (about 0.1 mm or less) made of a material such as phosphor bronze so as to receive a radio wave transmitted from a base station.
It has a meandering shape having an electrical length of 1/4 wavelength that resonates in the reception band. The power supply land 11 on the circuit board is connected to a power supply line (not shown) via a power supply line (not shown).
It is connected to a receiving circuit (not shown). The end portion 4 of the meander line antenna 3 has a spring structure, and makes elastic contact with the power supply land 11 by assembling the telephone. The structure may be such that a spring is elastically contacted. The meander line antenna 3 is fixed to the lower end 14 of the front case with a double-sided tape 10.

With this structure, the meander line antenna 3
Is located below the microphone 6, so that it does not approach the human body so much during a call. Further, even when the microphone is held by hand, the finger is less likely to be caught on the microphone, so that the radiation characteristics in an actual use state can be improved. In addition, since the distance from the whip antenna 9 can be increased, the correlation coefficient between the two antennas is reduced in the diversity operation, and the diversity reception characteristics are improved.

FIG. 2 shows a second embodiment of the present invention. 2, (a) is a side sectional view, and (b) is a view of the front case viewed from the back. 23 is a folded antenna made of thin sheet metal, and 15 is an external interface connector. Thus, for example, when the external interface connector 15 comes near the antenna, a folded antenna having a U-shape as in this embodiment may be arranged.

FIG. 3 shows a third embodiment of the present invention. 3A is a side sectional view, and FIG. 3B is a view of the front case of the main housing as viewed from the back. The portable wireless device shown in this example is of a foldable type, and an upper case 16 has an LCD 7,
The speaker 5 and the like are housed, and are rotatably connected to the main housing by hinges 17. Even in such a case, by disposing the meander line antenna 3 below the microphone,
Even when the hinge is open and when the hinge is closed, the upper housing is not particularly affected, and good characteristics can be realized in both states.

As a method of fixing the built-in antenna having a quarter wavelength to the inner wall of the front case, the embodiment shows a method of fixing with a double-sided tape. A method of soldering the end of the antenna to the feeding point may be considered. Alternatively, the circuit board may be attached to the key surface side with a double-sided tape or the like and arranged along the inner wall of the front case.

In the above embodiment, the built-in antenna having a quarter wavelength is directly fixed to the inner wall of the front case. However, the built-in antenna is fixed to the circuit board side so as to be disposed near the inner wall of the front case. Is also possible.

[0014]

According to the present invention, in the entire case having the first surface on which the receiver for arranging the speaker and the transmitter for arranging the microphone are formed, the first surface is removed to keep away from the first surface. In a mobile phone equipped with a whip antenna that can be pulled out from another surface and can be stored in a case from the pulled-out position, the side of the entire case where the mouthpiece of the first surface is formed The built-in antenna is fixed directly or near the inner wall of the end of the phone, so that this built-in antenna is the longest distance from the hand of the user holding the case during a call, and the mouth of the user during the call Lower than the above, so that the inherent radiation characteristics can be exhibited. Further, the distance from the whip antenna can be maximized, and the diversity effect at the time of reception can be enhanced.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a first embodiment of the present invention.

FIGS. 2A and 2B show a second embodiment of the present invention.

FIGS. 3A and 3B are views showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear case 2 Front case 3 Meander line antenna 4 Antenna end 5 Speaker 6 Microphone 7 LCD 8 Circuit board 9 Whip antenna 10 Double-sided tape 11 Power supply land 12 Battery 13 Rear case upper end 14 Front case lower end 15 External interface connector 16 Upper case 17 Hinge 23 Folded antenna

Claims (4)

[Claims] 1. An entire case having a first surface on which a receiver for arranging a speaker and a transmitter for arranging a microphone are formed, excluding the first surface to keep away from the first surface. In a mobile phone provided with a whip antenna that can be pulled out from another surface and can be stored in a case from the position where the wrist antenna is pulled out, the side of the entire case where the transmitting section of the first surface is formed A mobile phone characterized in that a built-in antenna is fixed directly to or near the inner wall of the end of the mobile phone. 2. The mobile phone according to claim 1, wherein the whip antenna and the built-in antenna form a diversity antenna. 3. The portable telephone according to claim 1, wherein said built-in antenna is a quarter wavelength line antenna. 4. The whole case is formed by joining and fixing a front case having a first surface and a rear case having a second surface opposed to the first surface, and is housed in the case. A power supply land provided at a position opposed to the built-in antenna directly fixed to an end inner wall of the first surface in the circuit board; and a power supply spring connecting the built-in antenna and the power supply land. The mobile phone according to claim 1, wherein one end of the power supply spring is fixed to one of the built-in antenna and the power supply land, and the other end is pressed against the other.