RFID reader supporting dense mode

The invention together with the supports for dense mode to reliably prevent interference between the reader by performing a tag and a communication through the thus search channel after finding the channels that are not occupied by a real-time radio wave monitoring device reader pause time by removing it relates to a passive RFID reader that supports a dense mode to maximize the efficiency of communications. Passive RFID reader that supports a dense mode of the present invention is a modulator which converts an analog signal after encoding and modulating the various inquiry signal; RF transmitter for radiation transmitted through the antenna to an analog signal which is modulated at the modulator output is frequency up-conversion and power amplification; RF receiver for down-converting the response signal from the tag is received through a receiving antenna after the power amplifier; A demodulator for demodulating and decoding after it is converted to a digital signal corresponding to the response signal provided from the RF receiver; Coupler is provided between the RF receiver and the receiving antenna to perform sampling of the query signals received from other reader to search for a frequency channel that is not currently occupied; Communication with the access to the scanning receiver and a frequency channel search result receiving offer thus identified after identify the frequency channel that is not currently occupied frequency channels from the scanned receiver for searching a frequency channel in all of the query signal sampled via the coupler tag It comprises a microcontroller to perform. RFID, reader, dense mode interference, scanning receivers, frequency, navigation, LBT, FHSS