AUTOMATIC IMPEDANCE MATCHING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an automatic impedance matching circuit for matching impedances of an antenna and a receiving circuit.

SOLUTION: An automatic impedance matching circuit 1 disposed between an antenna 11 and a receiving circuit 21 comprises: a matching circuit 12 which exists between the antenna 11 and the receiving circuit 21 and matches the impedances thereof; a reference signal transmission part 16 which transmits a reference signal for measuring a reflection amount so as not to interfere with a reception signal received by the receiving circuit 21; and a control part 17 which acquires a reflection amount in the reception frequency of the receiving circuit 21 using a reflection signal that is a signal of reflection to the reference signal of signals from the antenna 11 and controls the matching circuit 12 using the acquired reflection amount, thereby matching the impedances of the antenna 11 and the receiving circuit 21.

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