| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound high frequency circuit miniaturized, facilitated in impedance matching between an antenna terminal and a transmitting terminal, reduced in the number of parts and capable of stable operation. SOLUTION: This circuit is provided with an antenna terminal ANT for connecting an antenna, transmitting terminal Tx for connecting a transmitting circuit, receiving terminal Rx for connecting a receiving circuit, first strip line SL1 connected between the receiving terminal Rx and the antenna terminal ANT, second diode connected between the strip line SL1 on the side of the receiving terminal Rx and the ground, and first diode D1 to be used as one part of components of a low-pass filter LPF1 connected between the antenna terminal ANT and the transmitting terminal Tx.
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