| 摘要 |
PROBLEM TO BE SOLVED: To suppress harmonic distortion of a high-frequency module using a FET switch. SOLUTION: A FET switch SW10 including a FET allows an antenna input/output port ANT0 connecting to an antenna to connect to any of a port RF11 connecting to a transmission signal input terminal Tx1 and ports RF12 and RF13 respectively connecting to two reception signal output terminals Rx1 and Rx2 by switching between the ports. After a transmission signal is input through the transmission signal input terminal Tx1 and is then input from the port RF11 to the FET switch SW10, harmonic distortion occurs and is output to the transmission signal input terminal Tx1 side. A phase setting element L1 connecting to the port RF11 changes an impedance of the input side viewed from the port RF11 with respect to harmonics from an open state to a short state, so as to disperse the harmonics. Accordingly, harmonics returning to the port RF11 are suppressed. COPYRIGHT: (C)2009,JPO&INPIT
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