| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the low noise amplifier of a reception circuit from being saturated. SOLUTION: A transmission circuit 17 and a reception circuit 18 are connected to an antenna 22 through a duplexer 21 and the antenna 22 is simultaneously used for the transmission of a transmission signal from the transmission circuit 18 and the reception of a reception signal to a reception circuit 11. A cancel signal generation part 15 generating a cancel signal whose phase is opposite to the transmission signal from the transmission circuit 17 is installed. The cancel signal from the cancel signal generation part 15 is synthesized with the reception signal to the reception circuit 11 in a power synthesis part 14. The transmission signal from the transmission circuit 18, which leaks to the reception signal to the reception circuit 11 through the duplexer 21, is canceled. Thus, saturation in the low noise amplification part 13 is avoided.</p> |
