JPH11220418A - External antenna device for mobile phone terminals - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress deterioration of antenna characteristics particularly due to the influence of a human head when talking on a mobile phone terminal 1, and to enable stable transmission and reception. SOLUTION: An external antenna device 12 is mounted on a bottom surface side of a mobile phone terminal 1. This external antenna device 12
Are the high-frequency signal jacks 8a, 8b of the mobile telephone terminal 1.
, And high-frequency signal plugs 14a, 14b, and antennas 16a, 16b connected to the high-frequency signal plugs 14a, 14b in a high-frequency manner. Structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external antenna device mounted on a portable telephone terminal.

[0002]

2. Description of the Related Art First, the configuration of a conventional general portable telephone terminal will be described with reference to FIG. This figure shows a so-called horizontal state in which the mobile phone terminal is laid horizontally.

In FIG. 1, reference numeral 1 denotes a portable telephone terminal as a whole, and reference numeral 2 denotes a main body thereof. A transmitting / receiving antenna 3 is protrudingly provided on the top surface (upper surface) side of the portable telephone terminal main body 2. . In addition, a speaker 4, a display unit 5, a keypad 6, and a microphone 7 are arranged on the front surface 2a of the mobile phone terminal body 2 in this order from the top.

Further, on the bottom (lower) side of the portable telephone terminal body 2, high-frequency signal jacks 8a and 8b as high-frequency signal terminals to which an external antenna can be connected, and data transmission to information equipment are provided. The opening 1 is connected to a baseband signal jack 9 as a baseband signal terminal.
It is provided exposed from zero. The high-frequency signal jacks 8a and 8b and the baseband signal jack 9 are covered by a cover 11 fitted in the opening 10 in a normal state.

[0005]

By the way, when talking on the portable telephone terminal 1, the speaker 4 is brought close to the ear and the microphone 7 is brought close to the mouth. It is common. At this time,
Comparing the distance between the ear and the speaker and the distance between the mouth and the microphone, the distance between the ear and the speaker is almost always short (because it is usual to talk with the speaker in close contact with the ear). .

[0006] Since the speaker 4 is provided above the main body 2 of the portable telephone terminal, that is, at a position close to the antenna 3, the distance between the antenna 3 and the head of the human body is shortened as a result. The performance will be degraded.

In many cases, a portable telephone terminal used during a call is used while being tilted from a vertical state. In such a case, the radiation level of vertically polarized waves from the antenna 3 of the portable telephone terminal 1 is reduced, and When a station uses vertical polarization, loss occurs due to polarization mismatch.

In addition, when the mobile phone terminal 1
Is also placed horizontally, the loss due to the polarization mismatch occurs as described above. Furthermore, when the place where the mobile phone terminal 1 is placed horizontally is on a metal plate such as a steel desk, for example, the antenna characteristics may be significantly deteriorated due to the influence of the metal near the antenna 3.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, improve transmission / reception efficiency, and provide a suitable wireless environment.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an external antenna device mounted on a portable telephone terminal having an antenna on a top surface and a high-frequency signal terminal on a bottom surface. There is provided an external antenna device having a connection terminal connected to a high-frequency signal terminal, and an antenna connected to the connection terminal in a high-frequency manner and having a structure directly mounted on the bottom side of the mobile phone terminal. To provide. The external antenna device may have a function of changing the angle of the antenna. Further, in this external antenna device, the antenna may be made of a flexible material.

[0011] By mounting the external antenna device of the present invention on the bottom side of the portable telephone terminal, the distance between the human head and the antenna can be increased. It becomes possible to suppress. In addition, since the external antenna device of the present invention has a structure that is directly mounted on a mobile phone terminal, it is possible to suppress the occurrence of cable transmission loss.

Further, according to the present invention, by providing the function of changing the angle of the antenna, the antenna can be set upright even when the portable telephone terminal is placed horizontally.
The vertical polarization level is improved. Even if the mobile phone terminal is placed on a metal plate, the distance between the antenna and the metal plate can be increased, so that deterioration of the antenna characteristics can be suppressed.

Further, in the present invention, since the antenna is made of a flexible material, the antenna is always in a vertical direction by its own weight when talking on the mobile phone terminal, so that the mobile phone terminal is held in hand. It is possible to reduce loss due to polarization mismatch due to tilting.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. Here, a so-called horizontal state in which a mobile phone terminal is laid horizontally is shown.

In FIG. 1, reference numeral 1 denotes a portable telephone terminal as a whole, and reference numeral 2 denotes a main body of the portable telephone terminal 2. An antenna 3 for transmission / reception protrudes from a top surface (upper surface) of the portable telephone terminal 2. Also, the front part 2a of the mobile phone terminal body 2
, A speaker 4, a display unit 5, a keypad 6, and a microphone 7 are arranged in this order from the top side.

Further, on the bottom (lower) side of the portable telephone terminal body 2, high-frequency signal jacks 8a and 8b as high-frequency signal terminals to which an external antenna can be connected, and data transmission to information equipment are provided. The opening 1 is connected to a baseband signal jack 9 as a baseband signal terminal.
It is provided exposed from zero.

An external antenna device 12 according to the present invention is mounted on the portable telephone terminal 1. This external antenna device 12 has a rectangular housing 13 in appearance.
And a high-frequency signal plug 14 as a high-frequency signal connection terminal protruding from the surface of the housing 13.
a, 14b and antenna sections 15a, 15b.

The high-frequency signal plugs 14a, 14b and the antenna portions 15a, 15b are provided so as to protrude from opposite surfaces of the housing 13, and inside the housing 13, the high-frequency signal plugs 14a, 14b and the antenna portions 15a, 15b are provided. Antennas 16a and 16b are connected to each other and are connected at a high frequency.

The high-frequency signal plugs 14a and 14b are provided corresponding to the high-frequency signal jacks 8a and 8b of the portable telephone terminal 1, and are connected to be fitted to the high-frequency signal jacks 8a and 8b. .

The antenna 16 of the antenna sections 15a and 15b
A and 16b use a helical antenna in which a conductive wire is spirally wound in this example. In order to protect the antennas 16a, 16b, the antennas 16a, 16b,
The periphery of 16b is covered with cap-shaped resin-made antenna covers 17a and 17b, respectively.

The electrical length of the antennas 16a and 16b is determined by the wavelength of the frequency of the system used by the portable telephone terminal 1. When the input impedance of the antennas 16a and 16b is not matched with the characteristic impedance of the high-frequency signal plugs 14a and 14b, a matching circuit is provided in the housing 13 between the antennas 16a and 16b and the high-frequency signal plugs 14a and 14b. What is necessary is just to match.

The external antenna device 12 of the present embodiment configured as described above is configured such that the high-frequency signal plugs 14a and 14b are fitted to and connected to the high-frequency signal jacks 8a and 8b of the mobile phone terminal 1. It is mounted directly on the bottom side of the.

When the external antenna device 12 is mounted, the portable telephone terminal 1 performs electrical or mechanical switching to connect the electric circuit between the internal circuit of the portable telephone terminal 1 and the antenna 3 of the portable telephone terminal 1. As a result, the high-frequency signal from the internal circuit is transmitted to the antennas 16a and 16b of the external antenna device 12, and transmission and reception are performed by the antennas 16a and 16b.

As described above, the antennas 16a and 16b of the external antenna device 12 mounted on the bottom of the portable telephone terminal 1
The transmission and reception are performed by the user, so that the human head and the antennas 16a and 16
Since the distance to b can be increased, deterioration of antenna characteristics due to the influence of the human head can be suppressed, and stable transmission and reception can be performed.

The external antenna device 12 has a structure to be directly mounted on the portable telephone terminal 1, that is, since there is no long cable between the portable telephone terminal 1 and the external antenna device 12, No loss in gain due to the transmission loss occurs, and more stable transmission / reception is possible.

Further, since the external antenna device 12 can be directly mounted on the mobile phone terminal 1 and has a compact shape, it can be easily mounted on the mobile phone terminal 1 and used even when going out. It is convenient.

As shown in this example, in the case of a portable telephone terminal having diversity reception having two high-frequency signal jacks 8a and 8b, one of the high-frequency signal jacks 8a and 8b transmits and receives a main antenna. 1
6a, and the other high-frequency signal jack 8b is connected to an antenna 16b that performs only reception for diversity reception.
The working frequency of 6b may be slightly different.

In such a case, it is necessary to provide a means for preventing the external antenna device 12 from being erroneously mounted so that the antenna is not connected for transmission and reception and reception only. As the erroneous mounting prevention means, for example, a structure in which a protrusion is provided on one side of the mobile phone terminal 1 and the external antenna device 12 and a non-engaging recess which is oriented in a predetermined direction with the protrusion is provided on the other side. I just need.

In the case of a portable telephone terminal that does not perform diversity reception, the external antenna device 12 may have only one antenna.

Further, a lock mechanism for the external antenna device 10 may be provided so that the external antenna device 12 does not accidentally fall off the portable telephone terminal 1. This lock mechanism can be easily implemented by adopting a well-known mechanism such as a screw type or an elastic engagement type using a spring.

The external antenna device 12 of this embodiment may be provided with a through baseband signal jack for connecting the portable telephone terminal 1 to an information device such as a personal computer or a facsimile. In this case, the external antenna device 12 is provided with a baseband signal jack that is fitted and connected to the baseband signal jack 9 of the portable telephone terminal 1 together with the baseband signal jack for through. The structure is connected to the state.

FIG. 2 shows a second embodiment of the external antenna device according to the present invention. External antenna device 12 of this example
Is provided with a function of changing the angle of the antenna units 15a and 15b.

That is, in this example, the antenna sections 15a,
A shaft 18 is provided at a root portion of the shaft 15b, and the antennas 15a and 15b can be rotated with respect to the housing 13 using the shaft 18 as a fulcrum. FIG. 2A shows the antenna section 15a,
FIG. 2B shows a state in which the angle between 15b and the mobile phone terminal is 180 °, and FIG. 2B shows a state in which the angle between the antenna units 15a and 15b and the mobile phone terminal is 90 °.

Here, the shaft 18 is a screw shaft, and by adjusting the tightening torque of the screw shaft, the antenna portions 15a and 15b can be turned to the extent that they can be manually operated. Alternatively, the antenna portions 15a and 15b may be in a free state without resistance to the turning operation, and may be fixed at a position of, for example, 90 ° and 180 ° by a positioning stopper.

As described above, since the angles of the antenna portions 15a and 15b can be freely changed, the antenna portions 15a and 15b can be set upright even when the mobile phone terminal is placed horizontally, and the mobile phone terminal can be mounted. The vertical polarization level is improved as compared with the case where a single unit is placed horizontally.

Even if the mobile phone terminal is placed horizontally on a metal plate, the distance between the antenna and the metal plate can be increased by vertically setting the antenna portions 15a and 15b. As compared with a case where the terminal is placed alone on a metal plate, deterioration of antenna characteristics can be suppressed, and more stable transmission and reception can be performed.

FIG. 3 shows a third embodiment of the external antenna device according to the present invention. External antenna device 12 of this example
The antennas 15a and 15b are rotatable in all directions like a pen stand.

That is, in this embodiment, a ball portion 19 such as the base of a pen stand is formed at the base of the antenna portions 15a and 15b, and the ball portion 19 is fitted into a holding member 20 fixed to the housing 13 by fitting. With this portion as a fulcrum, the antenna portions 15a and 15b are configured to be rotatable in all directions.

In the embodiment of FIG. 2 described above, the rotation direction of the antenna portions 15a and 15b is one direction,
In this example, since the degree of freedom of rotation of the antenna units 15a and 15b is large, there is an advantage that the antenna units 15a and 15b and the rotation mechanism of the antenna unit are less likely to be damaged due to a fall or the like.

FIG. 4 shows a fourth embodiment of the external antenna device according to the present invention. External antenna device 12 of this example
Are the antennas 16a, 16a of the antenna portions 15a, 15b.
b and the antenna cover 17 are made of a flexible material.

Here, the antennas 16a and 16b are monopole antennas made of conductive wires. As the material of the antennas 16a and 16b, a soft material that can be restored immediately after bending slightly, such as a stranded wire formed by twisting copper wires or iron wires, or a superelastic material such as a nickel titanium alloy is used. The antennas 16a, 1
The electrical length of 6b is determined by the wavelength of the system used by the mobile phone terminal.

The antenna cover 17 is made of resin, and its flexibility is adjusted by adjusting its hardness. As a material of the antenna cover 17, a fiber or the like may be used in addition to the resin, or a resin and a fiber may be used in combination.

In this example, two antennas 16a and 16b
Is covered with one antenna cover 17, and the length of the antenna cover 17 is made longer than the sum of the antenna lengths of the two antennas 16a and 16b, so that the antenna cover 17 can be used as a hand strap. When the antenna cover 17 is used as a hand strap as described above, it is desirable that the antenna cover 17 be long enough that the antennas 16a and 16b do not touch the hand even if the user puts it on the hand (that is, longer than the circumference of the hand).

In the external antenna device 12 of the present embodiment configured as described above, since the antenna portions 15a and 15b have flexibility, the antenna portions 15a and 15b are mounted on the bottom side of the portable telephone terminal. Due to its own weight, it always faces vertically and emits vertically polarized waves. As a result, it is possible to reduce the loss due to the polarization mismatch caused by using the mobile phone terminal in a tilted state while holding it in a hand, and stable transmission and reception are performed.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, the high-frequency signal jack 8 of the mobile phone 1
a, 8b and high-frequency signal plug 1 of external antenna device 12
The relationship with 4a and 14b may be reversed. The shape and electrical length of the antennas 16a and 16b are not limited. Further, it goes without saying that various changes and modifications are possible in the configuration of each unit without being limited to the above example.

[0046]

According to the first aspect of the present invention, the distance between the head of the human body and the antenna can be increased by mounting the external antenna device of the present invention on the bottom side of the portable telephone terminal. In addition, it is possible to suppress deterioration of antenna characteristics due to the influence of the human head. Further, the external antenna device of the present invention is structured to be directly mounted on the mobile phone terminal, that is, since there is no long cable between the mobile phone terminal and the external antenna device, the occurrence of cable transmission loss is suppressed. It is possible to

According to the invention of claim 2 of the present invention, the function of changing the angle of the antenna is provided, so that the antenna can be set upright even when the mobile phone terminal is placed horizontally. , The vertical polarization level is improved as compared with the case where a single is placed horizontally. Even if the mobile phone terminal is placed on a metal plate, the distance between the antenna and the metal plate can be increased, so that the antenna characteristics are better than when the mobile phone terminal is placed alone on the metal plate. Can be suppressed from deteriorating.

Further, in the invention according to claim 3 of the present invention, the antenna is made of a flexible material, so that when talking on a mobile phone terminal, the antenna is always in a vertical direction due to its own weight. It is possible to reduce loss due to polarization mismatch due to holding and tilting the telephone terminal.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mobile phone terminal and an external antenna device according to a first embodiment of the present invention.

FIG. 2 is a side view of the external antenna device according to the second embodiment, in which (A) is a state in which the antenna is lying down,
(B) is a state in which the antenna is standing up.

3A and 3B are side views of an external antenna device according to a third embodiment of the present invention, in which FIG.
(B) is a state in which the antenna is standing up.

FIG. 4 is a perspective view of an external antenna device according to a fourth embodiment.

FIG. 5 is a perspective view of a mobile phone terminal.

FIG. 6 is an explanatory diagram of a use state of the mobile phone terminal.

[Explanation of symbols]

1 ‥‥ mobile phone terminal, 2 ‥‥ mobile phone terminal body, 3
{Antenna, 8a, 8b} High-frequency signal jack (high-frequency signal terminal), 12} External antenna device, 13}
Housing, 14a, 14b {high-frequency signal plug (connection terminal), 15a, 15b} antenna section, 16a, 1
6b antenna

Claims (3)

[Claims] 1. An external antenna device mounted on a mobile phone terminal having an antenna on a top surface and a high-frequency signal terminal on a bottom surface, comprising: a connection terminal connected to the high-frequency signal terminal; An external antenna device for a mobile phone terminal, comprising: a connection terminal; and an antenna connected in a high frequency manner, wherein the external antenna device is configured to be directly mounted on a bottom surface side of the mobile phone terminal. 2. The external antenna device according to claim 1, further comprising a function of changing an angle of the antenna. 3. The external antenna device according to claim 1, wherein the antenna is made of a flexible material.