Reflected power suppression circuit

Details Reflected power suppression circuit Reflected power suppression circuit

2007-03-13

2007-03-13

Urban, Edward F. (Department: 2618)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S127200, C455S115200, C330S298000

Reexamination Certificate

active

10983719

ABSTRACT:
An amplifier3amplifies a transmission signal, and outputs the amplified signal to an antenna. A directional coupler6causes a portion of power passing through a first path connecting the amplifier3and the antenna to branch to a second path. A detection section7detects an electrical parameter changing with a change in the intensity of power reflected from the antenna to the amplifier3, thereby detecting the intensity of the reflected power. A control circuit8changes a proportion of power caused to branch to the second path by the directional coupler6, based on the electrical parameter detected by the detection circuit7. Thus, it is possible to provide a reflected power suppression circuit capable of facilitating size reduction and preventing a power amplifier from being damaged due to breakage of an antenna, while minimizing a power loss at the time of signal transmission.

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patent: 2002-76791 (2002-03-01), None

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