JPH0779110A - Radio telephone set - Google Patents

Abstract

PURPOSE:To provide a portable radio telephone set while reducing adverse effect of a transmission wave onto a human body without sacrificing the characteristic of the antenna. CONSTITUTION:The telephone set is made up of a radio equipment main body 21 and a mobile body 22 engaged with the radio equipment main body 21 freely open/closed. The mobile body 22 is in the open position in the talking state and in the closed position in the non-talking state. An antenna 10 for transmission/reception is made up of a radiation conductor 11 and a ground conductor 12. The radiation conductor 11 and the ground conductor 12 are arranged to the mobile body 22. The radiation conductor 11 and the ground conductor 12 are arranged to the mobile body 22 in a way that the ground conductor 12 is at a position to be interposed between the radiation conductor 11 and the user in the talking state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio telephone device.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a general appearance of a mobile phone. An operation key 2 such as a dial key is provided on the front of the mobile phone 1, and a through hole 3 for a receiver is provided. , A through hole 4 for a transmitter is formed. A whip antenna 5 having a predetermined length is provided on the upper surface of the telephone 1.

However, since the antenna 5 projects from the telephone 1, it is not only easily damaged, but also the telephone 1
It becomes an obstacle when downsizing.

An inverse F-type antenna using a flat radiating conductor is known as a means for compensating for the drawbacks of the whip antenna.

FIG. 7 shows the basic structure of an inverted F-type antenna. Reference numeral 10 is the inverted F-type antenna, 11 is a radiation conductor, 12 is a ground conductor (ground plane), and 15 is a feeding portion. In this case, the conductors 11 and 12 are formed by rectangular conductor plates, and are provided in parallel with each other with a predetermined interval so as to face each other.

Further, the end portion of the radiation conductor 11 has a conductive member 13
Is connected to the ground conductor 12 through the conductor 1 and
Reference numerals 1 and 12 are connected to a power feeding unit 15 through a coaxial cable 14. Further, at this time, the feeding point 11P for the radiation conductor 11 is set to an asymmetrical position as viewed from the conductive member 13 (this is a point corresponding to the intermediate tap of the coil), and impedance matching is performed.

Therefore, the inverted F type antenna 10 is
If it is provided in a state where it is embedded in the top surface or the back surface of the mobile phone 1, the protrusions from the mobile phone 1 disappear,
The problem as in the case of the whip antenna 5 does not occur.

[0008]

However, when the inverted F-type antenna 10 is provided on the upper surface or the back surface of the mobile phone 1, when the user holds the phone 1 in his / her hand, the influence of the human body causes the antenna 10 to move. Radiation characteristics are disturbed and effective gain is reduced.

Furthermore, since the antenna 10 is located near the user's head, especially near the auditory organ during a call, the radio waves emitted from the antenna 10 may adversely affect the auditory organ and the like. .

The present invention is intended to eliminate the above problems while taking a form suitable for miniaturization of a mobile phone.

[0011]

For this reason, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the radio main body 21 and the radio main body 21 are openably and closably engaged. In a radiotelephone device 20 having a movable body 22, which is in an open position during a call and in a closed position during a non-call, an antenna 10 for transmission and reception is provided with a radiation conductor 11 and a ground conductor. 12 and the radiation conductor 11 and the ground conductor 12 are connected to the movable body 2
2, the radiation conductor 11 and the ground conductor 12 are arranged in a positional relationship in which the ground conductor 12 is interposed between the radiation conductor 11 and the user during a call.

[0012]

When the telephone call is made, the grounding conductor 12 is interposed between the radiation conductor 11 and the user's head.
The transmitted wave radiated from almost never hits the head directly.
Further, the radiation characteristic of the antenna 10 is not affected.

[0013]

1 to 3 show an example of the present invention.
2 is a cross-sectional view and a perspective view during the call, and FIG.
[Fig. 4] is a sectional view during standby.

In these figures, reference numeral 20 indicates a mobile phone according to the present invention. The telephone 20 is constructed so that it can be folded in half as a whole, and 21 is its main body and 22 is a lid. Then, the lid portion 22 is attached to the main body portion 21 to support the spindle 2.
It can be opened and closed by 3.

In this case, the main body portion 21 and the lid body portion 22 are
Each has a flat rectangular parallelepiped shape, and when the main body portion 21 and the lid body portion 22 are folded (the state shown in FIG. 3), the whole is substantially a rectangular parallelepiped shape, and a large protrusion such as an antenna The shapes of the parts 21 and 22 are set so that there are no objects.

Inside the case (cabinet) of the main body 21, a main circuit required for a mobile phone, that is, a radio circuit 31 for making a call or connecting to a base station, a receiver 32, Battery for power supply (not shown)
Etc. are provided. Further, an operation key 33 such as a dial key is provided on a front surface (a surface facing the lid portion 22) 21A of the main body portion 21, and a through hole 34 for a receiver is formed.

Furthermore, inside the case of the lid portion 22,
A transmitter 41 is provided, and a front surface of the case (a surface facing the main body 21) 22A has a through hole 42 for the transmitter.
Are formed. It should be noted that some circuits such as a preamplifier for the transmitter 42 may be provided inside the lid portion 22.

Further, particularly in the present invention, the above-mentioned inverted F type antenna 10 is provided inside the lid portion 22. In this case, the antenna 10 is made up of those conductors 11, 1
2 is provided so as to be parallel to the front surface 22A, the radiation conductor 11 is provided on the back surface (the surface opposite to the facing surface 22A) 22B side, and the ground conductor 12 is provided on the front surface 22A side.

Also, in this example, the conductors 11 and 12
And a predetermined low-loss dielectric layer 16 are interposed between the antenna and the antenna, and the antenna 10 is downsized or the area is reduced.

The antenna 10 is connected to the radio circuit 31 through the coaxial cable 14.

According to this structure, the lid portion 22 is connected to the body portion 21 as shown in FIG. 1 or 2 during a call.
Open from. Then, the receiver 32 and the transmitter 41 are
The call is made facing the user's ear and mouth,
In this state, as shown in FIG. 1, the ground conductor 12 is interposed between the radiation conductor 11 of the antenna 10 and the user's head. Therefore, the transmitted wave emitted from the radiating conductor 11 almost never hits the head directly, and the adverse effect on the auditory organs can be significantly reduced.

Since most of the circuits are housed in the main body 21 and the main body 21 is heavier than the lid 22,
When dialing or making a call, the user holds the main body 21 to make a dial or make a call. Therefore, the user's hand or head does not shield the radiation side of the antenna 10. Radiation characteristics are not disturbed,
You can make dials and calls reliably.

Furthermore, when the telephone 20 is placed in a standby state, that is, not used for a call, when the telephone 20 is placed on a desk or the like, the lid portion 22 is folded with respect to the main body portion 21 as shown in FIG. It will be placed in an appropriate place in a folded state. At this time, if the lid 22 is placed so that it is on the upper side, the radiation conductor 11 of the antenna 10 is connected to the ground conductor 12.
Since the antenna 10 is located on the side open from the desk or the like with the gap, the radiation characteristic of the antenna 10 is not disturbed, and when the incoming call is received, it can be reliably received.

Alternatively, when carrying the telephone 20 in a pocket or the like, as shown in FIG. 4, if the main body 21 is placed in the pocket so that the body portion 21 is on the human body side, the antenna 10
Since the radiating conductor 11 is released from the human body by the grounding conductor 12, the radiation characteristic of the antenna 10 is not disturbed, and the incoming call can be reliably received.

Moreover, since the antenna 10 does not project from the main body portion 21 and the lid portion 22, it is excellent in portability and suitable for miniaturization. Furthermore, antenna 1
Since 0 is built in the lid portion 22, it is possible to make a call and the like by simply opening the lid portion 22 from the main body portion 21, and it is not necessary to pull out the antenna.

FIG. 5 shows an example of connection between the antenna 10 and the radio circuit 31. That is, the wireless circuit 31 is connected to the receiving circuit 5
1, a transmission circuit 52, an antenna common circuit 53, and the like. Then, at the time of a call, a downlink channel radio signal from the base station is received by the antenna 10, and the received signal is a signal of the DC cut capacitor 55 → the coaxial cable 14 → the DC cut capacitor 54 → the common circuit 53. The reception signal is supplied to the reception circuit 51 through the line, the reception signal is extracted, and the reception signal is supplied to the receiver 32.

Further, the transmission signal from the transmitter 41 is supplied to the transmission circuit 52 through the signal line of the high frequency choke coil 57 → the coaxial cable 14 → the high frequency choke coil 56 to be an up channel radio signal. Signal is shared circuit 53 → capacitor 54 → coaxial cable 1
4 → Antenna 10 through signal line of capacitor 55
And transmitted to the base station.

At this time, for example, when the transmitter 41 is composed of an electret condenser microphone and its buffer amplifier and requires a DC power source, the DC power source is transmitted from the transmission circuit 52 to the above-mentioned The signal line of the transmitted signal can be supplied to the transmitter 41 through the signal line in the opposite direction.

With such a connection, it is possible to reduce the number of connection lines between the main body part 21 and the lid part 22 that are opened and closed, so that the connection lines can be easily processed, and disconnection or the like can be performed. You can reduce the trouble of.

In the above description, the main body 21 is provided with the handset 32 and the lid 22 is provided with the transmitter 41. On the contrary, the main body 21 is provided with the transmitter 41. It is also possible to provide the receiver 32 on the lid portion 22. However, in this case, the telephone 20 is used upside down from that of FIG.

When a microstrip line is used as the power feed line to the antenna 10, a ¼ wavelength stub can be used instead of the high frequency choke coil 57.

[0032]

According to the present invention, the antenna 1 is used during a call.
Since the ground conductor 12 is interposed between the radiating conductor 11 of 0 and the user's head, radio waves emitted from the radiating conductor 11 rarely directly hit the head,
It is possible to significantly reduce adverse effects on the auditory organs and the like.

Further, the user's hand or head is fixed to the antenna 10
Since the antenna is not shielded, the radiation characteristic of the antenna 10 is not disturbed, and dialing and talking can be performed reliably.

Further, since the telephone 20 is not used for a call, when the telephone 20 is placed on a desk or the like, if the lid 22 is placed on the upper side, the radiating conductor 11 of the antenna 10 is placed between the grounding conductors 12. Since it is located on the side opened from the desk or the like, the radiation characteristic of the antenna 10 is not disturbed, and when the incoming call is received, it can be reliably received.

Alternatively, when carrying the telephone 20 in a pocket or the like, as shown in FIG. 4, if the body portion 21 is placed in the pocket so that the body portion 21 is on the human body side, the antenna 10
Since the radiating conductor 11 is released from the human body by the grounding conductor 12, the radiation characteristic of the antenna 10 is not disturbed, and the incoming call can be reliably received.

Moreover, since the antenna 10 does not project from the main body portion 21 or the lid portion 22, it is excellent in portability and suitable for miniaturization. Furthermore, antenna 1
Since 0 is built in the lid portion 22, it is possible to make a call and the like by simply opening the lid portion 22 from the main body portion 21, and it is not necessary to pull out the antenna.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of the present invention during a call.

FIG. 2 is a perspective view of an example of the present invention during a call.

FIG. 3 is a sectional view of an example of the present invention during standby.

FIG. 4 is a schematic diagram of an example of the present invention when being carried.

FIG. 5 is a connection diagram of an example of the present invention.

FIG. 6 is a perspective view of a conventional example.

FIG. 7 is a perspective view for explaining an inverted F type antenna.

[Explanation of symbols]

 10 Inverse F-type Antenna 11 Radiation Conductor 12 Grounding Conductor 20 Mobile Phone 21 Main Body 22 Lid Body 31 Radio Circuit 32 Handset 41 Transmitter

Claims (6)

[Claims] 1. A radio body and a movable body that is openably and closably engaged with the radio body, the movable body being in an open position during a call and in a closed position during a non-call. In a radiotelephone device, an antenna for transmission / reception is composed of a radiation conductor and a ground conductor, and these radiation conductor and ground conductor are arranged on the movable body, and at the time of communication, the ground conductor is used together with the radiation conductor. A radiotelephone device in which the radiation conductor and the ground conductor are arranged in a positional relationship between the person and the person. 2. The radiotelephone device according to claim 1, wherein the radiation conductor and the ground conductor are flat. 3. The radiotelephone device according to claim 1, wherein the radio unit main body is provided with a handset, and the movable body is provided with a transmitter. 4. The radiotelephone device according to claim 1, wherein a transmitter is provided on the main body of the radio and a receiver is provided on the movable body. 5. The wireless telephone device according to claim 3 or 4, wherein at least a part of the connection line of the antenna and the connection line of the transmitter or the receiver are shared. 6. The radiotelephone device according to claim 5, wherein a high frequency blocking circuit is provided on a connection line of the transmitter or the receiver.