READER OF RFID WHEREIN FREQUENCY DISPERSION IS PREVENTED

摘要

PURPOSE: A frequency spreading prevention RFID(Radio Frequency Identification) reader is provided to calculate spreading components using paratactically a low pass filter and a high pass filter. CONSTITUTION: A base-frequency band contraction unit(21) calculates the spreading component of a result which the signal of a necessary frequency band is eliminated in the transmission signal of a base frequency band. The base-frequency band contraction unit synthesizes the transmission signal of the base frequency band with the reversed spreading component. The base-frequency band contraction unit outputs the synthesized transmission signal of the synthesized result. A oscillator(202) generates an oscillation signal. An upper mixer(205) changes the synthesized transmission signal into the transmission signal of a wireless frequency band.