FREQUENCY CHANNEL SCANNING DEVICE FOR RFID READER

摘要

A frequency channel scanning apparatus in an RFID(Radio Frequency IDentification) reader is provided to reduce manufacturing cost by including only one low pass analog filter. A frequency channel scanning apparatus in an RFID reader includes an antenna(10), a band pass filter(20), a mixer(30), a low pass analog filter(40), an analog/digital converter(50), and a frequency channel scanning unit(60). The antenna(10) receives a signal. The band pass filter(20) passes a predetermined band from the signal received in the antenna(10). The mixer(30) mixes a predetermined local frequency with the signal passed through the band pass filter(20), and performs frequency down-conversion. The low pass analog filter(40) passes only a band which corresponds to an objective band width. The analog/digital converter(50) converts the signal passed through the low pass analog filter(40) to a digital signal. The frequency channel scanning unit(60) performs frequency channel scanning of the digital signal. The frequency channel scanning unit(60) is formed in a multi-phase structure including a plurality of multi-phase filters.