COMMUNICATION DEVICE AND COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide good broadband characteristics without impairing frequency characteristics of a bandpass filter even in a case of impedance mismatch of a high frequency coupler.SOLUTION: A proximity wireless communication system 10 comprises a transmitter 100 and a receiver 200, respectively including a transmission circuit 110 and a reception circuit 210 for processing a high frequency-signal to transmit data, bandpass filters 115 and 215, and high frequency couplers 120 and 220. An electrical length of a distribution constant line 125 connecting a high frequency coupler 120 and a bandpass filter 115 in the transmitter 100 is different from an electrical length of a distribution constant line 225 connecting a high frequency coupler 220 and a bandpass filter 215 in the receiver 200.