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Mobile communication terminal

A technology of mobile communication terminals and phase shifters, which is applied in antenna support/installation devices, electrical components, sustainable buildings, etc. It can solve the problems of antenna transmission power reduction, communication quality degradation, and the degradation of antenna characteristics that cannot be improved. Achieve the effect of reducing the transmission power and preventing the decline of communication quality

Inactive Publication Date: 2006-12-20
PANASONIC CORP
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AI Technical Summary

Problems solved by technology

[0004] However, in the mobile communication terminal device of the prior art, when the user's head or finger touches or approaches the antenna, the antenna can be matched even after the impedance mismatch is detected, so that the impedance caused by the impedance mismatch can be improved. The resulting decrease in antenna gain, but it cannot improve the degradation of antenna characteristics caused by the absorption of electromagnetic waves by the human body.
Therefore, the transmission power of the antenna may decrease due to the influence of the human body, and the communication quality may decrease

Method used

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Embodiment Construction

[0030] FIG. 1 is a block diagram illustrating the main configuration of a mobile communication terminal device according to an embodiment of the present invention. 2 and 3 are Smith charts illustrating the operation of the mobile communication terminal device of this embodiment. This embodiment shows a configuration example applicable to a mobile communication terminal device such as a mobile phone used close to the head of a human body.

[0031] As shown in FIG. 1 , the mobile communication terminal device 1 of this embodiment includes an antenna 10 for transmitting and receiving electromagnetic waves, a transmitter 21 for generating a high-frequency signal for transmission to the antenna 10, and processing a high-frequency signal received by the antenna 10. The structure of the receiver 22 of the wireless machine 20. Here, in the wireless device 20, the transmitter 21 is connected to a transmission circuit (not shown) that generates a transmission signal, and the receiver 2...

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Abstract

Communication quality can be favorably maintained without lowering the transmission power of an antenna even if a part of a human body comes into contact with the antenna or approaches the antenna. A transmitter (21) of a mobile communication terminal (1) is composed of a power amplifier (211) and a phase shifter (212) connected between an antenna (10) and the power amplifier (211). The impedance in the free space of the antenna (10) is matched to the output load impedance of the power amplifier (211) during low output power. As a result, if the head or a finger of a human body touches the antenna (10) and the impedance increases, the impedance of the antenna (10) is varied to the output load impedance at which the output power value of the power amplifier (211) increases by means of the phase shifter (212).

Description

technical field [0001] The present invention relates to mobile communication terminal devices such as mobile phones. Background technique [0002] For mobile communication terminal devices such as mobile phones, when the user's head or fingers touch or approach the antenna, the impedance of the antenna changes, resulting in a mismatch with the output load impedance of the power amplifier, and the antenna gain decreases. In addition, the antenna characteristics Sometimes it deteriorates due to the absorption of radio waves by the human body. [0003] Figure 6 A configuration example of a conventional mobile communication terminal device is shown. The mobile communication terminal device of this prior art example is composed of an antenna 31 , a duplexer 32 , a wireless transmitting unit 33 , a wireless receiving unit 34 , a matching unit 35 , a directivity matching unit 36 ​​and a detection unit 37 . In this configuration, the impedance of antenna 31 viewed from duplexer 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H01Q1/24H01Q3/28H01Q23/00
CPCH01Q3/28H04B1/04H01Q23/00Y02B60/50H01Q1/242
Inventor 中里光晴渡边聪
Owner PANASONIC CORP
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