NON-CONTACT COMMUNICATION DEVICE AND ANTENNA RESONANCE FREQUENCY CONTROL METHOD

摘要

An antenna drive unit has: an oscillator capable of controlling an oscillating frequency; an output part for supplying high frequency signal obtained by the oscillator to an antenna resonance circuit; a controller for controlling the oscillating frequency of the oscillator and the antenna resonance frequency of the antenna resonance circuit; and a phase detector for detecting a phase of output current or output impedance of the output part, wherein the oscillating frequency of the oscillator is controlled by the controller according to an operation mode, and also, the resonance frequency of the antenna resonance circuit is controlled by the controller based on the phase of output current or output impedance of the output part detected by the phase detector.

主权项

1. A non-contact communication device comprising:
an antenna resonance circuit capable of controlling a resonance frequency of an antenna for communicating with other party by electromagnetic coupling; and an antenna drive unit connected to the antenna resonance circuit, wherein the antenna drive unit comprises: an oscillator capable of controlling an oscillating frequency; an output part for supplying high frequency signal obtained by the oscillator to the antenna resonance circuit; a controller for controlling the oscillating frequency of the oscillator and the antenna resonance frequency of the antenna resonance circuit; and a phase detector for detecting a phase of output current or output impedance of the output part, wherein the oscillating frequency of the oscillator is controlled by the controller according to an operation mode, and also, the resonance frequency of the antenna resonance circuit is controlled by the controller based on the phase of output current or output impedance of the output pan detected b the phase detector.