| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio transmitting circuit, a radio communication circuit, a radio transmitter, and a radio communication apparatus capable of selecting a matching circuit suitable for actual communication state of a terminal by simple control. SOLUTION: The radio communication apparatus comprises an antenna 1 for sending out a radio signal into atmosphere at least, an LSI 8 for outputting an electrical signal to the antenna 1, a coupler 5 for guiding reflected waves of the electrical signal reflected by the antenna 1 to a path different from the LSI 8, an LSI 8 for detecting the strength of the reflected waves inputted from the antenna 1 through the coupler 5, and an LSI 8 for selecting a matching circuit for matching impedance between the antenna 1 and the electrical signal among a plurality of matching circuit groups with different characteristics, in response to the detection result of the strength of the reflected waves. COPYRIGHT: (C)2007,JPO&INPIT
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