Patent ID: 9438303
Filing Date: 2016-09-06
CPC Classification: H04B

Claim Text:
1. A front end circuit comprising: an antenna port into/from which transmission/reception signals of an antenna are input/output; a reception port from which the reception signal is output; a transmission port into which the transmission signal is input; and a transmission output variable circuit having an antenna side switch, a plurality of duplexers, a transmission side switch and a reception side switch, a common terminal of the antenna side switch being connected to an antenna side, common terminals of the duplexers being connected to individual terminals of the antenna side switch, a common terminal of the transmission side switch being connected to the transmission port side, a common terminal of the reception side switch being connected to the reception port side, individual terminals of the transmission side switch being connected to transmission terminals of the duplexers, individual terminals of the reception side switch being connected to reception terminals of the duplexers, the transmission output variable circuit being connected between the common terminal of the transmission side switch and the transmission port, the transmission output variable circuit limiting strength of the transmission signal according to a control signal.