Patent ID: 9407315
Filing Date: 2016-08-02
CPC Classification: H04B

Claim Text:
1. A transmission/reception device comprising: a transmission circuit; a reception circuit; an antenna; an antenna sharing device connecting the antenna to the transmission circuit and connecting the antenna to the reception circuit; reflected-signal-detection means disposed between the antenna sharing device and the antenna and detecting a reflected signal, wherein the reflected signal is a part of a transmission signal output from the transmission circuit and reflected by the antenna; a duplexer disposed between the antenna sharing device and the transmission circuit and retrieving a signal from the transmission signal; a cancellation-signal-output circuit outputting a cancellation signal used for cancelling the reflected signal based on the signal retrieved by the duplexer; a multiplexer disposed between the antenna sharing device and the reception circuit and combining the cancellation signal with a received signal to be input to the reception circuit; a delay circuit disposed on at least one of first and second connection lines, the first connection line connecting the duplexer to the multiplexer via the cancellation-signal-output circuit and the second connection line connecting the duplexer to the multiplexer via the antenna sharing device; and a control circuit controlling the cancellation-signal-output circuit, wherein the control circuit adjusts an amplitude and a phase of the cancellation signal based on an amplitude and a phase of the reflected signal detected by the reflected-signal-detection means.