JP2002176380A - Radio terminal equipment, switching method of transmission antenna used for the same and weighting method of transmission antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that the characteristic of an antenna deteriorates at the time of transmission and communication is temporarily interrupted and a line is cut due depending on the state of a terminal, hand held when the terminal is used, by the right hand or the left hand and the relative position of the antenna and a human body in radio terminal equipment such as the portable information terminal. SOLUTION: A leak signal detecting device detecting the leak signal of a transmission signal transmitted from radio terminal equipment having a plurality of the antennas or a contact sensor detecting which part of the terminal is brought into contact with the human body is arranged. The antenna in the better state is selected or the weighting of the better state is added by the transmission signal based on the detection result and the signal is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small wireless terminal device such as a portable telephone, and more particularly to a wireless terminal device having good antenna characteristics during transmission and having little transmission deterioration.

[0002]

2. Description of the Related Art In a portable information wireless terminal device such as a portable telephone (PDC: personal digital cellular),
The usage state of the wireless terminal device (used as a telephone or used as a terminal input, etc.), the hand position when holding the wireless terminal device, which hand holds the wireless terminal device, or the antenna of the wireless terminal device and the wireless terminal There is a problem that the antenna characteristics of the wireless terminal device are deteriorated due to various usage patterns such as a positional relationship between a user of the device and a human body.

[0003] For this reason, in a digital cellular phone or the like, a plurality of antennas are incorporated in a wireless terminal device, and reception diversity is performed to select the best antenna during reception. However, at the time of transmission, since it is difficult to determine which antenna radiates radio waves to space most efficiently with only the wireless terminal device, only a single antenna among a plurality of antennas is used. There are many examples.

[0004] Therefore, when the antenna characteristics used for transmission deteriorate due to the above-described deterioration of the antenna characteristics, there is a problem that communication is temporarily interrupted or the line is disconnected. Alternatively, there is a problem in that the radiation characteristics of the antenna deteriorate due to the influence of the human body of the user who uses the wireless terminal device.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a wireless terminal device which eliminates the influence of the use state of the wireless terminal device at the time of transmission and has little transmission deterioration. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a wireless terminal device according to the present invention comprises a housing, a plurality of antennas provided in the housing, an input device, and an output device. A transmission signal is transmitted from a selected one of the antennas, a leakage signal of a transmission signal transmitted from a plurality of antennas is detected by a leakage signal detection device, and an antenna is detected based on the strength of the leakage signal. The transmission is switched.

A wireless terminal device according to the present invention includes a housing, a plurality of antennas, an input device, and an output device provided in the housing, and adds weights to transmission signals transmitted from the plurality of antennas. Transmitting a combined transmission signal, detecting a leakage signal of the combined transmission signal by a leakage signal detection device, and switching and transmitting a weight added to the transmission signal based on the strength of the leakage signal. It is assumed that.

The wireless terminal device according to the present invention comprises a housing, a plurality of antennas, an input device, and an output device provided in the housing, and further includes a contact sensor for detecting contact with a human body. The antenna is switched and transmitted based on the detection output of the contact sensor.

The wireless terminal device of the present invention comprises a housing, a plurality of antennas, an input device, and an output device provided in the housing, and adds weights to transmission signals transmitted from the plurality of antennas. A transmission sensor for transmitting and synthesizing the transmission signal, further providing a contact sensor for detecting a contact of a human body, and switching and transmitting a weight added to the transmission signal based on a detection output of the contact sensor. is there.

Further, in the method of switching the transmitting antenna of the antenna used for the wireless terminal device, one antenna is sequentially selected from a plurality of antennas, and the leakage signal of the transmitting signal transmitted from the selected antenna is sequentially detected. A transmitting antenna selecting step of detecting and selecting a maximum antenna of a value of a leak signal, a step of switching to a selected antenna selected by the transmitting antenna selecting step and transmitting a transmitting signal from the selected antenna, Detecting a leakage signal of the transmitted transmission signal, and when the leakage signal deviates from a predetermined value, selecting a selected antenna again by the transmission antenna selection step. .

[0011] In the weighting method for transmitting antennas of the present invention, a plurality of weights set in advance to be added to a plurality of antennas are sequentially added, and the added weights cause leakage of transmission signals transmitted from the plurality of antennas. Signals are sequentially detected, a transmission weight addition selection step of selecting a maximum weight of a leaky signal, and a weight selected by the transmission weight addition selection step is added to the plurality of antennas, and a transmission signal is output from the plurality of antennas. Transmitting, and detecting a leakage signal of the combined transmission signal transmitted from the plurality of antennas. If the leakage signal deviates from a predetermined value, a plurality of transmission weight addition and selection steps are performed again by the transmission weight addition selection step. In which the weights to be added to the antennas are selected.

[0012]

1 and 2 are diagrams showing a first embodiment of a wireless terminal device according to the present invention. Fig. 1 (a)
FIG. 1B is a diagram of the wireless terminal device as viewed from the front, and FIG. 1B is a diagram of the wireless terminal device as viewed from the back. As shown in FIG. 1 (a), a display unit 2 for displaying characters and images, an input unit 3 for inputting telephone numbers and characters, a speaker unit 4 for receiving a call, It comprises a microphone 5 and a monopole antenna 6 for transmitting radio waves from the wireless terminal device. FIG.
As shown in (b), an inverted-F antenna 7 and a leakage power detection device 8 are provided on the back side of the housing 1. Note that the inverted F antenna 7 and the leakage power detection device 8 are attached to an internal substrate (not shown) constituting the wireless terminal device, and are not actually seen from the back surface of the wireless terminal device. ) Are indicated by dotted lines. The same applies to the following embodiments.

FIG. 2 is a circuit diagram of the wireless terminal device.
2 and transmitted from the monopole antenna 6 or the inverted F antenna 7. An output signal from the leakage power detection device 8 is supplied to a selection circuit 13, and a control signal is supplied from the selection circuit 13 to the changeover switch 12 in accordance with the output signal. Alternatively, the inverted F antenna 7 switches.

The leakage power detection device 8 is composed of a probe 8-1, a detection circuit 8-3, and a matching circuit 8-2 for impedance matching between the probe 8-1 and the detection circuit 8-3.
In the leak detection device 8, the power picked up by the probe 8-1 due to electromagnetic coupling with a current flowing on the housing 1 of the wireless terminal device during transmission of the wireless terminal device, or the monopole antenna 6 or the inverted F antenna The power received by the probe 8-1 is detected from the power radiated from the space 7 into the space.

The selection circuit 13 includes a judgment device 13-1 and a storage device 13
-2, a switch drive circuit 13-3, and when a signal from the leakage power detection device 8 is input to the determination device 13-1, the determination device 13-1 stores the signal in the storage device 13-2. A signal is supplied to the switch drive circuit 13-3 so as to select an antenna having a large leakage power as compared with the leakage power associated with the antenna. Further, a control signal is supplied from the switch drive circuit 13-3 to the changeover switch 12.

The monopole antenna 6 and the inverted F antenna 7 radiate radio waves into space when the wireless terminal device performs wireless communication. The changeover switch 12 is a switch for switching an antenna used for transmission, and is switched to one of the antennas by a control signal output from the selection circuit 13.

Next, a first embodiment of the present invention will be described with reference to the flowchart of FIG. Here, an example is shown in which the wireless terminal device performs transmission by the time division multiplexing method and first radiates a transmission radio wave by a monopole antenna.
First, of course, the transmission radio wave may be radiated from the inverted F antenna. In this case, the monopole antenna and the inverted F antenna are replaced in the flowchart of FIG.

As shown in FIG. 3, when the wireless terminal device starts a transmission request (101), a call is first made with the monopole antenna 6 (102).

At this time, the leakage power from the monopole antenna 6 is detected by the leakage power detection circuit 8. (103).

Further, the detection signal is supplied to the selection circuit 13, and is temporarily stored as leakage power of the monopole antenna (104).

Next, at the time of the next time slot, the changeover switch 12 is switched, and a call is made using the inverted F antenna 7 (105).

At this time, the leakage power from the inverted F antenna 7 is detected by the leakage power detector 8 (106).

Further, this detection signal is supplied to the selection circuit 13, and is temporarily stored in the storage device 13-2 as leakage power of the inverted F antenna (107).

After the operations (102) to (107) are repeated about 3 to 10 times, the leakage power of the monopole antenna 6 and the inverted F antenna 7 stored in the storage device 13-2 of the selection circuit 13 is detected. The result is compared by the judgment device 13-1 (108).

As a result of the comparison, a control signal for switching the changeover switch 12 is transmitted from the switch drive circuit 13-3 of the selection circuit 13 to the changeover switch 12 so as to transmit with an antenna having a large leakage power. Send it (109).

Thereafter, the leakage power of the selected antenna is detected by the leakage power detection device 8 (110), and the monitoring of the leakage power is performed by the judgment device 13-1 of the selection circuit 13. Continues transmission with the same selected antenna (111), but if the value falls below a predetermined value, the operations from (102) to (109) are repeated again to determine an optimal antenna.

That is, in the wireless terminal device according to the first embodiment of the present invention, in the initial stage, a call is made while switching between the monopole antenna 6 and the inverted F antenna 7 by the changeover switch 12 for each time slot, and Each of the leakage powers detected at 8 is monitored by the selection circuit 13. At this time, it can be estimated that the antenna having the higher leakage power level operates with a radiation pattern closer to the omnidirectionality in the horizontal plane, and it can be determined that the antenna characteristics are good.

Therefore, the selection circuit 106 compares the leakage power between the monopole antenna 6 and the inverted F antenna 7 and
A control signal is supplied to the changeover switch 12 so as to select the antenna having the larger leakage power, and the changeover switch 1
Switch 2. In the subsequent transmission, the signal is transmitted by the switched antenna.

Further, at the time of transmission, the leakage power of the antenna selected by the leakage power detection device 8 is periodically monitored. When the leakage power decreases, the changeover switch is switched in a certain time slot, and the switching switch is switched again in each time slot to compare the leakage powers of the monopole antenna 6 and the inverted-F antenna 7 to obtain a larger leakage power. Switch to the antenna and transmit.

The arrangement of the leakage power detecting device 8 on the housing 1 is as follows.
When the wireless terminal device has an omnidirectional radiation pattern in a horizontal plane, it is preferable to arrange the wireless terminal device in a portion where the current flowing on the housing is concentrated. When it is used as a loudspeaker, it is installed at a position opposite to the speaker unit 4 and the microphone 5, that is, at a side away from the human body.

Note that the circuit configuration of the wireless terminal device is not limited to a configuration such as selection diversity for simply selecting one antenna as shown in FIG. 2, but also a monopole antenna 6 and an inverted F antenna as shown in FIG. A configuration such as combining diversity via a weight control circuit 22 for controlling the weight for feeding power to the power supply 7 may be used.

That is, as shown in FIG. 4, the transmission signal from the transmission section 21 is transmitted from the monopole antenna 6 and the inverted F antenna 7 via the weighting circuit 22. Further, the leakage power of the monopole antenna 6 and the inverted F antenna 7 is detected by the leakage power detection circuit 8, and the leakage power detection device 8
Is supplied to the weighting control circuit 23.

The weighting control circuit 23 comprises a judging device 23-1, a storage device 23-2, and a weighting driving circuit 23-3, and a signal from the leakage power detecting device 8 is input to the judging device 13-1. And the determining device 13-1 compares the leakage power associated with the weight added to the antenna stored in the storage device 13-2, and selects a weight having a large leakage power so as to select a large weight of the leakage power. Supply signal to 23-3. Further, a control signal is supplied from the weighting drive circuit 23-3 to the weighting circuit 22.

The weighting circuit 22 is composed of a variable amplifier and a variable phase shifter. The weighting circuit 22 controls the amplitude and phase of the power from the transmitting unit 21 that feeds the monopole antenna 6 and the inverted F antenna 7, and This is a circuit for changing the radiation pattern of the sum of the power radiated from the antenna. The weighting circuit 22 is provided to the weighting circuit 22 in accordance with the output signal supplied from the leakage power detection device 8 to the weighting control circuit 23.
The variable amount of each of the variable amplifier and the variable phase shifter that constitutes 2 is changed.

As shown in the flowchart of FIG. 5, when the wireless terminal device starts a transmission request (201), a variable amplifier is first set to have weight 1 (amplitude a1 and phase amount b1) as shown in the flowchart of FIG. And the variable phaser
(202) A call is originated by the monopole antenna 6 and the inverted F antenna 7 (203).

At this time, the leakage power due to the combined output of the monopole antenna 6 and the inverted F antenna 7 is detected by the leakage power detection circuit 8 (204).

Further, this detection signal is supplied to the weighting control circuit 23, and is stored as the amount of leakage power of weight 1 in the storage device 23.
The data is temporarily stored in -2 (205).

Thereafter, by changing the weights 2 to n (amplitude amounts a 2 to an and phase amounts b 2 to bn) for each time slot, the amount of leakage power for each weight is stored in the storage device.
Store it in 23-2.

After the end of n times, the judgment device 23-1 compares the detection results of the leakage power when the weight is changed (206).

As a result of the comparison, a control signal is sent from the weighting drive circuit 23-3 to the weighting circuit 22, and the weighting circuit 22-3
Select a large weight (combination of amplitude and phase) of the leakage power, and use the weight to select the monopole antenna 6.
And the signal is transmitted by the inverted F antenna 7 (207).

Thereafter, the leakage power from the monopole antenna 6 and the inverted-F antenna 7 according to the selected weight is detected by the leakage power detection device 8, and the leakage power is monitored by the determination device 23-1 of the weighting control circuit 23. If the leakage power is equal to or greater than a predetermined value, transmission is continued with the selected weight added.
(208), if the leakage power falls below the predetermined value,
The operations from 2) to (207) are repeated, and the optimal weight is determined again.

That is, in this embodiment, several combinations of weights are provided in advance for the amplitude and the phase to be fed to the monopole antenna 6 and the inverted F antenna 7, and at the initial stage, the weight is switched for each time slot to make a call. Then, the leakage power detected by the leakage power detection device is monitored by the weighting control circuit 106. At this time, it can be estimated that the weights (amplitude amount and phase amount) at which a higher leakage power level is obtained are operating with a radiation pattern close to the omnidirectionality in the horizontal plane, and that the antenna characteristics are good. I can judge. Therefore, on subsequent transmissions,
Use this combination.

Further, at the time of transmission, the leakage power of the monopole antenna 6 and the inverted F antenna 7 based on the weight selected by the leakage power detection device 8 is periodically monitored. When the leakage power decreases, the weight is switched in a certain time slot, and several kinds of weights prepared in advance for each time slot are switched again.
Then, the leakage power of the inverted F antenna 7 is compared, and the weight is switched to a weight that can obtain a larger leakage power and transmitted.

FIG. 6 is a diagram showing another embodiment of the wireless terminal device according to the present invention, which has a structure in which no current flows through the housing. As shown in FIG. 6 (a), the wireless terminal
It is an openable / closable type consisting of the housing 31-1 and the second housing 31-2. The housing 31-1 is fixed horizontally and the housing 31-2 is used upright with the housing 31-1. I do. The housing 31-1 is provided with an input device 32 for inputting characters and the like to the wireless terminal device. The housing 32-2 is provided with a display unit 33 for displaying characters and images and the like and a radio terminal 2 for transmitting radio waves. There are provided monopole antennas (34-1, 34-2). Furthermore, near the monopole antennas (34-1, 34-2), leakage power detection devices (35-1, 35-2) corresponding to the respective monopole antennas (34-1, 34-2) are installed. ing.

FIG. 6B is a circuit configuration diagram of the wireless terminal device. A transmission signal from the transmission unit 36 is transmitted from one of the monopole antennas via the changeover switch 37. An output signal from the leakage power detection device (35-1, 35-2) is supplied to a selection circuit 38, and a control signal is supplied from the selection circuit 38 to a changeover switch in accordance with the output signal. The monopole antenna switches according to the control signal.

The selection circuit 38 is composed of the same determination device, storage device, and switch drive circuit as the selection circuit 8 shown in FIG. 2, and the operation is the same, so that the description is omitted here.

In the same manner as in the first embodiment shown in FIG. 1, when the wireless terminal device originates a call, the wireless terminal device first operates the switch 37 by a control signal from the selection circuit 38 for each time slot. A call is made while switching between the pole antenna 34-1 and the monopole antenna 34-2, and the magnitude of the leakage power detected by each of the leakage power detection devices (35-1, 35-2) is monitored by the selection circuit 38. At this time, the leakage power detected by the leakage power detection device 35-1 when transmitted by the monopole antenna 34-1 and the leakage power detected by the leakage power detection device 35-2 when transmitted by the monopole antenna 34-2 To the leakage power.

When the monopole antenna (34-1, 34-2) is operating as an ideal antenna, the housing (31-1, 31-1)
-2) hardly current flows. That is, the power detected by the leakage power detection device (35-1, 35-2) is the coupling power in the vicinity of the antenna, and is considered to be substantially proportional to the power supplied to the antenna.

That is, when there is reflection near the monopole antenna, the power supplied to the monopole antenna decreases. For example, the leakage power detected by the leakage power detection device 35-1 when transmitted by the monopole antenna 34-1 and the leakage power detection device 35-2 when transmitted by the monopole antenna 34-2
When the power of the leakage power detection device 35-1 is larger than the leakage power detected in
It is considered that -1 is operating in an ideal state.

Therefore, at the time of the subsequent transmission, the monopole antenna having the higher leakage power is selected and the changeover switch 37 is switched. When transmitting, periodically monitor the strength of the leaked power, and when the power falls,
In a certain time slot, the switch 37 is switched and transmitted, and each monopole antenna (34-1, 34-2) is transmitted.
And compare the intensity of the leakage power. Then, in the subsequent transmission, the antenna that can obtain a higher leakage power intensity is used.

Note that the selection circuit 38 may be composed of a judgment device and a switch drive circuit. In this case, the changeover switch 37 is appropriately switched by leakage power.

FIG. 7 shows another embodiment of the wireless terminal device according to the present invention. FIG. 7 (a) is a view of the housing 41 as viewed from the front, and FIG. 7 (b) is a view as viewed from the back. . As shown in FIG. 7A, on the surface of the housing 41, a display unit 42 for displaying characters and images, an input unit 43 for inputting a telephone number and characters, a speaker unit 44 for receiving a call, The microphone 45 includes a monopole antenna 46 for transmitting radio waves from a wireless terminal. The speaker unit 44 is provided with a leakage power detection device 48, which is installed at a position where the leakage power detection device 48 comes into contact with the earlobe in a state where the speaker unit 44 is used for normal voice conversation. Further, as shown in FIG.
1 has an inverted F antenna 47 on the back side.

That is, in this embodiment, the configuration other than that the leakage power detection device 47 is installed at a position where it touches the earlobe in a state where the leakage power detection device 47 is used in a normal voice conversation is shown in FIG.
This is the same as the embodiment shown in FIG. The circuit diagram is also
FIG. 7C is the same as FIG. 2 shown in the first embodiment.
Shown in However, the antenna switching sequence is shown in FIG.
This is slightly different from the embodiment shown in FIG.

When the wireless terminal device originates a call, first, the switch 52 switches the antenna 4 for each time slot.
A call is made while switching between 6 and 47, and the output of the transmitting unit 51 is output from one of the antennas. The leakage power detection device 48 selects the power output from the antenna
Monitor each with. In this embodiment, since the leakage power detection device 48 is located at a position in contact with the earlobe, the large leakage power detected by the leakage power detection device 48 indicates that current flows from the housing 41 to the earlobe, that is, the human body. Means that. In this case, the antenna characteristics of the wireless terminal deteriorate.

Therefore, in the example in which the leaked power detecting device 48 is installed at a position in contact with the human body as in this embodiment, the leaked power detected by the leaked power detecting device 48 at the time of calling and monitored by the selection circuit 53 Is selected, and the changeover switch 52 is switched. In the subsequent transmission, the leakage power of the selected antenna is periodically monitored, and when the detected power becomes high, the changeover switch 52 is switched in a certain time slot, and the transmission is performed using another antenna that is not selected. Compare with power. In the subsequent transmission, the antenna that can obtain smaller leakage power is used. Such an operation is periodically performed at the time of transmission, and the antenna is switched to an antenna having a smaller power detected by the leakage power detection device 48.

As described above, the antenna having less deterioration of the antenna characteristics due to the influence of the human body is selected.

The configuration of the antenna may of course be a configuration such as combining diversity.

FIG. 8 is a diagram showing another embodiment of the wireless terminal device according to the present invention.

FIG. 8A is a diagram of the wireless terminal device as viewed from the front, and FIG. 8B is a diagram of the wireless terminal device as viewed from the back. As shown in FIG. 7A, on the surface of the housing 61, a display unit 62 for displaying characters and images, an input unit 63 for inputting a telephone number and characters, a receiving speaker unit 64, It comprises a microphone 65 and a monopole antenna 66 for transmitting radio waves from a wireless terminal. Also, as shown in FIG.
, An inverted F antenna 67 is provided. further,
Leakage power detection devices 68-1 to 68-4 are provided on the front surface of case 61, and leakage power detection devices 68-5 to 68-6 are provided on the back surface of case 61, respectively.

FIG. 8C is a circuit diagram of the wireless terminal device. The transmission signal from the transmission unit 71 is transmitted to the monopole antenna 66 or the inverted F
It is transmitted from the antenna 67. Also, a leakage power detection device
Output signals from 68-1 to 68-6 are supplied to a selection circuit 73,
In response to the output signal, a control signal is supplied from the selection circuit 73 to the changeover switch, and the changeover switch 72 switches the monopole antenna 66 or the inverted F antenna 67 according to the control signal.

The leakage power of the selected antenna is detected by each of the leakage power detection devices 68-1 to 68-6, and the respective detection signals are monitored by the selection circuit 73. When a predetermined portion of the wireless terminal device is held by a hand, the leakage power intensity detected by a leakage power detection device near the hand is weakened. That is, it is possible to estimate which position of the wireless terminal device the user has based on a change in the detection output of the leakage power detection device.

Therefore, when the power of any of the leakage power detectors 68-1 to 68-6 is weakened, the selection circuit 73 is connected to either the monopole antenna 66 or the inverted F antenna 67. A table indicating whether radio waves are radiated most efficiently when selected is provided, and an antenna in a good state is selected and used based on the table. For example, usually a built-in inverted F antenna 67
When the position of the hand is close to the built-in antenna (for example, when the leakage power of the leakage power detection devices 68-1 and 68-2 decreases), control is performed such that the monopole antenna 66 is used.

In the above embodiment, the monopole antenna 66 or the inverted-F antenna 67 is used by switching. However, the monopole antenna 66 and the inverted-F antenna 67 are combined and the transmission power supplied to each antenna is reduced. A diversity configuration that changes the weight (amplitude, phase) may be used.
In this case, the weight of each antenna can be changed and used according to the detection result of each leakage power detection device.

Further, in order to prevent the deterioration of antenna characteristics due to the transmission power from the radio terminal device flowing to the human body of the terminal user, in the above embodiment, the leakage power detection devices 68-1 to 68-1 to
The leakage power of the antenna is detected by the 68-6, but instead of the leakage power detection devices 68-1 to 68-6, the contact of the human body with a thermocouple, capacitance sensor, or resistance measurement circuit is detected. A sensor device that can be used may be used.

In this case, depending on the use situation (use as a mobile phone or use as an input device of a mobile terminal), the user of the wireless terminal device changes the capacitance when holding with the hand of the wireless terminal device or the surface temperature due to the body temperature. Are detected by these sensor devices, and the data is supplied to the selection circuit. Furthermore, by changing the amount of amplitude or the amount of phase when the antenna is switched or the antenna is combined with the control signal from the selection circuit, deterioration of antenna characteristics can be prevented, and efficient transmission can be performed.

[0066]

As described above, in the wireless terminal device of the present invention, it is possible to perform transmission with better antenna characteristics at the time of terminal transmission, and to perform efficient transmission communication.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a wireless terminal device according to the present invention.

FIG. 2 is a diagram showing a circuit configuration in an embodiment of the wireless terminal device according to the present invention.

FIG. 3 is a flowchart in one embodiment of a method for switching a transmitting antenna of an antenna used in a wireless terminal device according to the present invention.

FIG. 4 is a diagram showing a circuit configuration in another embodiment of the wireless terminal device according to the present invention.

FIG. 5 is a flowchart in one embodiment of a method for weighting a transmitting antenna of an antenna used in a wireless terminal device according to the present invention;

FIG. 6 is a diagram showing a configuration in another embodiment of a wireless terminal device according to the present invention.

FIG. 7 is a diagram showing a configuration of another embodiment of the wireless terminal device according to the present invention.

FIG. 8 is a diagram showing a configuration of another embodiment of the wireless terminal device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing | casing 2 ... Display part 3 ... Input part 6 ... Monopole antenna 7 ... Inverted F antenna 8 ... Leakage power detection apparatus 12 ... Changeover switch 13 ... Selection circuit 22 ... weight addition circuit 23 ... weight addition control circuit

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 5J021 AA02 AA13 AB00 AB02 DB01 DB05 FA00 FA02 FA04 FA21 FA30 FA31 GA01 JA01 5J047 AA03 AB00 AB06 FA09 FA12 FD01 5K059 CC02 DD02 DD10 DD31 5K067 AA13 BB02 CC24 DD44 FF16 GG01

Claims (11)

[Claims] 1. A wireless terminal device comprising a housing and a plurality of antennas, an input device, and an output device provided in the housing and transmitting a transmission signal from a selected antenna among the plurality of antennas. A switching device that switches the plurality of antennas, a leak signal detection device that detects a leak signal of a transmission signal transmitted from the switched antenna, and a leak signal that is detected based on the strength of the leak signal detected by the leak signal detection device. And a control circuit for supplying a switching control signal to the switching device. 2. A housing, comprising a plurality of antennas, an input device, and an output device provided in the housing, adding weights to transmission signals transmitted from the plurality of antennas and synthesizing the transmission signals. In a transmitting wireless terminal device, a weighting device for switching a weight added to the transmission signal; a leakage signal detection device for detecting a leakage signal of a transmission signal synthesized and transmitted from the plurality of antennas; and the leakage signal detection device. A weighting control device for supplying a control signal for switching the weight of the weighting device based on the strength of the leakage signal detected by the wireless terminal device. 3. The leakage signal detection device according to claim 1, wherein the leakage signal detection device is arranged at a portion where leakage current flowing on a housing is concentrated when a transmission signal having an omnidirectional radiation pattern in a horizontal plane is radiated from an antenna. The wireless terminal device according to claim 1, wherein the transmission is performed in a state where the strength of the leakage signal detected by the wireless terminal is large. 4. The leak signal detecting device is installed close to the monopole antenna, wherein the plurality of antennas are monopole antennas, and the intensity of the leak signal detected by the leak signal detecting device is high. The transmission is performed in the following condition:
Or the wireless terminal device according to claim 2. 5. The leak signal detecting device according to claim 1, wherein the leak signal detecting device is disposed at a portion in contact with a human body, and transmits the signal in a state where the intensity of the leak signal detected by the leak signal detecting device is low.
Or the wireless terminal device according to claim 2. 6. A wireless terminal device comprising a housing and a plurality of antennas, an input device, and an output device provided in the housing and transmitting a transmission signal from a selected antenna among the plurality of antennas. A switching device that switches the plurality of antennas, a contact sensor that is disposed on the housing and detects contact with a human body, and a control circuit that supplies a switching control signal to the switching device based on a detection output of the contact sensor. A wireless terminal device comprising: 7. A housing, comprising a plurality of antennas, an input device, and an output device provided in the housing, adding weights to transmission signals transmitted from the plurality of antennas and synthesizing the transmission signals. A wireless terminal device for transmitting; a weighting device for switching a weight added to the transmission signal; a contact sensor arranged on the housing to detect contact with a human body; and the weighting device based on a detection output of the contact sensor. A weighting control device for supplying a control signal for switching a weight of the adding device. 8. The storage device according to claim 1, wherein the control circuit stores the strength of the leak signal detected by the leak signal detecting device in association with the antenna, and controls the antenna based on the strength of the leak signal stored in the storage device. 2. The wireless terminal device according to claim 1, further comprising a determining device for selecting, and a switch driving circuit for supplying a control signal to the switching device to select an antenna selected by the determining device. 9. A storage device for storing the strength of a leak signal detected by the leak signal detecting device in association with the weight added to the antenna,
A determining device for selecting the weight of the antenna based on the strength of the leakage signal stored in the storage device, and a weighting driving circuit for supplying a control signal to the weighting device for selecting the weight selected by the determining device The wireless terminal device according to claim 2, comprising: 10. A transmission antenna switching method for switching a plurality of antennas of a wireless terminal device having a plurality of antennas and performing transmission by switching these antennas, wherein one of the plurality of antennas is sequentially selected. A transmission antenna selection step of sequentially detecting a leakage signal of a transmission signal transmitted from the selected antenna and selecting an antenna having a maximum value of the leakage signal; and a selection antenna selected in the transmission antenna selection step. Switching, transmitting a transmission signal from the selected antenna, and detecting a leakage signal of a transmission signal transmitted from the selection antenna, wherein when the leakage signal deviates from a predetermined value, A transmission antenna switching method, wherein a selection antenna is selected in a transmission antenna selection step. 11. A weighting of a transmitting antenna for weighting a plurality of antennas of a wireless terminal device having a plurality of antennas and transmitting weighted transmission signals transmitted from the plurality of antennas. In the method, a plurality of preset weights to be added to the plurality of antennas are sequentially added, and a leak signal of a transmission signal transmitted from the plurality of antennas is sequentially detected based on the added weights. A transmission weight addition selection step of selecting a weight; a step of adding a weight selected by the transmission weight addition selection step to the plurality of antennas, and transmitting a transmission signal from the plurality of antennas; Detecting a leakage signal of the synthesized transmission signal to be transmitted, and when the leakage signal deviates from a predetermined value, the transmission weighting is performed again. A weighting method for transmitting antennas, wherein weights to be added to a plurality of antennas are selected in an adding / selecting step.