JP2000091828A - Outside antenna connecting device for simple portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a simple portable telephone set even in a narrow closed space in the same way as a portable telephone set. SOLUTION: A holder 3 is formed of a back plate 4, a pair of elastically deformable both arm parts 5, and bottom part 6, and a connector 8 having a cap 9 is fixed to the upper part of the back plate 4. A simple portable telephone set 1 is grasped by the both arm parts 5 of the holder 3 so as to be mounted on the holder 3 while the cap 9 can be covered with an antenna 2. An electrical field coupling circuit and a magnetic field coupling circuit are provided in the cap 9, and the transmission power of the simple portable telephone set 1 is extracted to a feeder 10 connected with an outside antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone which is used in a small closed space such as a room or a vehicle.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external antenna coupling device for a simple portable telephone that couples the portable cellular phone to an antenna in an external space via a feeder line.

[0002]

2. Description of the Related Art A portable telephone is provided with an external antenna terminal. When the portable telephone is used in a narrow closed space, an antenna outside the housing is used via the external antenna terminal.

[0003]

However, since the portable telephone has no external antenna terminal, it is difficult to extract an electrically large transmission signal. Therefore, when a simple portable telephone is used in a closed space, it can only be used in an environment where the electric field strength is quite strong, and its use has been limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a portable cellular phone which can be used in a narrow closed space like a cellular phone. An antenna coupling device is provided.

[0005]

In order to achieve this object, an external antenna coupling device in a portable cellular phone according to the present invention comprises a feed line connected to an external antenna and a transmission power of the portable cellular phone connected to the feed line. A circuit for taking out the portable telephone is provided. The coupler comprises a coupler capable of covering the circuit with the antenna of the portable cellular phone, and a holder for detachably holding the portable cellular phone. Therefore, by attaching the coupler to the antenna of the portable cellular phone when necessary, the radiated radio wave of the portable cellular phone can be easily guided to the feed line.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an external antenna coupling device in a simple mobile phone according to the present invention, (a) is a perspective view showing a state where the simple mobile phone is attached to the device,
(B) is a perspective view showing the appearance of the device. FIG. 2 is a schematic diagram of a coupling circuit of the same device, and FIG. 3 is a block diagram of a coupling circuit of the same device. In FIG. 1, reference numeral 1 denotes a simple portable telephone, on which a wavelength shortening helical whip antenna 2 is provided. Reference numeral 3 denotes a holder, which is a back plate 4, and a pair of elastically deformable arms 5, 5 erected on both sides of the back plate 4 so as to face each other.
And a bottom 6 erected at the lower end of the back plate 4.

The holder 3 has an inverted L-shape when viewed from the side.
A coupling 9 attached to the upper portion of the back plate 4 is a cap formed in a cylindrical shape with a bottom and opened at the bottom and closed at the upper portion. Have been. Reference numeral 10 denotes a feed line connected to an external antenna (not shown), which is connected to a feed line matching circuit 17 provided in the coupler 8 and described later.

In FIGS. 2 and 3, three pairs of magnetic couplings arranged in multiple stages are provided in a cap 9 in order to efficiently couple an electromagnetic field radiated from the helical whip antenna 2 to the feed line 10. Loop antenna 11a, 1
1b and 11c are provided. These loop antennas 11a, 11b, and 11c have a wiring length that resonates at a frequency used in the portable cellular phone 1, and a magnetic field provided in the coupler 8 to combine currents induced in each of them in phase. A phase corresponding to the phase of the traveling wave to the lithical antenna 2 is added by the coupling phase adjustment circuit 15.

In the cap 9, three pairs of electric field coupling crown loads 12a, 12b, 12c and three pairs of top-loading whip antennas arranged in multiple stages to improve the degree of electric field coupling are provided. Electric power supply circuits 13a, 13b, and 13c for electric field coupling are provided, respectively, to form a whip antenna. The three pairs of top coupling loads 12a, 12b, and 12c for electric field coupling are of a top-loading type so that the whip antenna resonates, and the couplers 8 are connected so that the coupling currents from the feed circuits 13a, 13b, and 13c for electric field coupling have the same phase. Are combined by the electric field coupling phase adjustment circuit 16 provided in the first embodiment.

Reference numeral 14 denotes an electric field coupling ground plane connected to the electric field coupling phase adjusting circuit 16, and 17 denotes a feeder line matching circuit.
The phase of the magnetic field coupling phase adjusting circuit 15 and the electric field coupling phase adjusting circuit 16 are combined in the same phase, and are matched to the line impedance of the feed line 10 and connected to the feed line 10.

In such a configuration, when the portable cellular phone 1 is used in a narrow closed space, the portable cellular phone 1 is engaged between the both arms 5 and 5 from below the holder 3 and the antenna The simple mobile phone 1 is attached to the holder 3 by engaging the lower end with the bottom 6 so as to cover the base 2 and elastically holding the lower end 2 with the arms 5, 5. By covering the antenna 2 with the cap 9 in this manner, as shown in FIG.
Are surrounded by three pairs of magnetic field coupling loop antennas 11a, 1
1b, 11c and three pairs of overhead loads 12a, 1 for electric field coupling.
2b and 12c.

Radio waves radiated from the antenna 2 of the portable cellular phone 1 are transmitted to the magnetic field coupling loop antennas 11a and 11a.
b, 11c and three pairs of overhead loads 12a, 12 for electric field coupling.
The transmission power of the portable telephone 1 can be taken out to the power supply line 10 via b and 12c. That is, the magnetic field coupling phase adjusting circuit 15, the electric field coupling phase adjusting circuit 16 and the feed line matching circuit 17 form the three magnetic field coupling loop antennas 11a, 11b and 11c and the three pairs of electric field coupling crown loads 12a, 12b and 12c. Since the phases are adjusted so that the coupling between the respective circuits is maximized, the transmission power is efficiently extracted to the power supply line 10. Therefore, the radio wave radiated from the portable cellular phone 1 can be easily led out of the closed space from the external antenna (not shown) via the feeder line 10, so that the portable cellular phone 1 can be used even in a narrow closed space. In addition, in a normal use in a space other than the closed space, the arms 3 and 5 of the holder 3 can be elastically deformed and expanded, and the simple mobile phone 1 can be removed from the holder 3.

FIG. 4 is a perspective view showing a second embodiment of the present invention. In the second embodiment, a flexible flaky fixing member 20 is attached to a lower end of the coupler 8 in order to attach the coupler 8 to the portable cellular phone 1.
A surface fastener 21 is provided on the surface of the fixing member 20. Therefore, when the portable cellular phone 1 is used in a narrow closed space, the cap 9 is covered by the antenna 2 of the portable cellular phone 1 and the hook-and-loop fastener 21 is attached to the portable cellular phone 1, whereby the above-described first portable telephone 1 is attached. Can be used in the same manner as the mobile phone of the embodiment. For normal use outside the closed space, the hook-and-loop fastener 21 is peeled off from the portable cellular phone 1, and the cap 9 is removed from the antenna 2 of the portable cellular phone 1.

In this embodiment, the coupler 8 and the holder 3 are integrated, but the coupler 8 is slidable with respect to the holder 3 and the holder 3 holds the portable telephone 1. The cap 9 may be removed from the antenna 2 in the state as it is.

[0015]

As described above, according to the present invention, by attaching the coupler to the antenna of the simple portable telephone, the radiated radio wave of the simple portable telephone can be easily guided to the feeder line. Can be used even in a narrow closed space like a mobile phone, and the coupler can be easily removed from the simple mobile phone.
Usability during normal use does not deteriorate.

[Brief description of the drawings]

FIGS. 1A and 1B show an external antenna coupling device in a portable cellular phone according to the present invention, wherein FIG. 1A is a perspective view showing a state where the portable cellular phone is attached to the device, and FIG. It is.

FIG. 2 is a schematic diagram of a coupling circuit of the external antenna coupling device in the portable cellular phone according to the present invention.

FIG. 3 is a block diagram of a coupling circuit of the external antenna coupling device in the portable cellular phone according to the present invention.

FIG. 4 is a perspective view showing a second embodiment of the external antenna coupling device in the portable cellular phone according to the present invention.

[Explanation of symbols]

1. Simple mobile phone, 2. Antenna, 3. Holder, 8.
Coupler, 9 cap, 10 feed line, 11a to 11c
... Loop antenna for magnetic field coupling, 12a to 12c ... Pain load for electric field coupling, 13a to 13c ... Feeding circuit for electric field coupling,
15: magnetic field coupling phase adjustment circuit, 16: electric field coupling phase adjustment circuit, 17: feed line matching circuit, 20: fixing band, 21 ...
Hook-and-loop fastener.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J047 AA02 AA04 AA09 AB06 AB11 FD01 FD02 5K011 AA06 AA16 DA02 JA01 JA03 KA12 5K023 AA07 BB06 DD06 EE01 LL05 MM25 PP02 PP12 RR01 RR03 RR08

Claims (1)

[Claims] A power supply line connected to an external antenna and a circuit for extracting the transmission power of the portable telephone are provided on the power supply line. An external antenna coupling device for a simple mobile phone, comprising a holder for detachably holding the mobile phone.