Patent ID: 7562828
Filing Date: 2009-07-21
Classification: G06K

Abstract:
1. A radio communication device capable of communicating with a plurality of kinds radio communication media having different resonant frequencies, comprising: a modulation circuit for modulating transmission data; an output line circuit for outputting signals modulated by the modulation circuit; a transmission/reception antenna for transmitting the signals from the output line circuit to the radio communication media and receiving signals from the radio communication media; an input line circuit for inputting signals from the transmission/reception antenna; a phase control circuit for controlling phases of signals from the input line circuit; and a demodulation circuit for demodulating an output from the phase control circuit; wherein the phase control circuit controls its own resonant frequency to a second resonant frequency which is different from a first resonant frequency of the transmission/reception antenna, tuned to and resonated with resonant frequencies of the radio communication media and which is not resonated with the resonant frequencies of the radio communication media.