Patent ID: 9537531
Date: 2017-01-03
CPC Classifications: H04B

Claim:
1. A communication device including a communication circuit capable of switching reception or transmission of a desired frequency signal through an antenna, wherein the communication circuit comprises: an oscillator that oscillates a first frequency signal according to the desired frequency signal at a receiving time; a first divider that outputs a second frequency signal obtained by dividing the first frequency signal into two; a second divider that outputs a third frequency signal obtained by dividing the second frequency signal into two; a first mixer that mixes a reception signal received through the antenna and the first frequency signal and outputs an intermediate frequency signal; a second mixer that mixes the intermediate frequency signal and the third frequency signal and outputs a baseband signal; a third mixer capable of mixing the output from the first divider and the output from the second divider; and a filter circuit that eliminates a signal component of frequency of an output signal from the third mixer from the reception signal at the receiving time.