Frequency switcher, RFID system and distance measuring apparatus incorporating the frequency switcher

摘要

A modulator is operable to modulate a carrier wave with quadrature signals including a Sin signal and a Cos signal which serve as an I signal and a Q signal. A frequency controller is operable to control frequencies of the quadrature signals to switch a transmission frequency of the carrier wave. A transmitter is operable to transmit the modulated carrier wave with the switched transmission frequency.