Patent ID: 7873318
Filing Date: 2011-01-18
Classification: H01Q

Abstract:
1. A radio-frequency communication device arranged to transmit a transmitted signal from a transmitter antenna device toward a communication object, and to receive through a receiver antenna device a reply signal transmitted from the communication object, for radio communication with the communication object, said radio-frequency communication device comprising: a transfer-function calculating portion configured to calculate a transfer function indicative of a relationship between a signal input to said transmitter antenna device and a signal generated by said receiver antenna device due to said signal input to said transmitter antenna device; a receiver-circuit-constant setting portion configured to set a receiver-circuit constant for improving a quality of said reply signal received by said receiver antenna device, on the basis of said transfer function calculated by said transfer-function calculating portion, and said signal input to said transmitter antenna device; and a cancel-signal generating portion configured to generate a cancel signal, which is added to a leakage signal that is generated by said receiver antenna device due to transmission of said transmitted signal from said transmitter antenna device, for canceling the leakage signal, wherein said receiver-circuit-constant setting portion is configured to set, as said received-circuit constant, a constant for determining a phase and an amplitude of said cancel signal.