WIRELESS COMMUNICATION APPARATUS
PROBLEM TO BE SOLVED: To automatically carry out the impedance matching between an antenna and a receiving circuit by a matching circuit.SOLUTION: In a reception mode, a switch 50 connects a matching circuit 20 and a receiving circuit 30, and a switch 51 opens between an antenna 10 and the receiving...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To automatically carry out the impedance matching between an antenna and a receiving circuit by a matching circuit.SOLUTION: In a reception mode, a switch 50 connects a matching circuit 20 and a receiving circuit 30, and a switch 51 opens between an antenna 10 and the receiving circuit 30, and a microcomputer 90 performs signal processing on a received signal outputted from the receiving circuit 30. In a tuning mode, the switch 50 connects a local oscillator 36 and the matching circuit 20, and the switch 51 connects the antenna 10 and the receiving circuit 30. The antenna 10, the matching circuit 20, and the local oscillator 36 configure a resonance circuit. At this time, a control circuit 70 controls the impedance of the matching circuit 20 so that a voltage value outputted from a voltage detection circuit 40 approaches a reference voltage value that is preliminarily set, based on the voltage value. |
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