From the radio wave identification leader and midst

摘要

PROBLEM TO BE SOLVED: To provide a radiofrequency identification (RFID) reader and RFID system, more specifically, to provide a RFID reader and RFID system in which a reception performance is improved by using a "listen-before-talk" (LBT) scheme.;SOLUTION: An RFID reader 200 comprises a frequency oscillation unit 201 which generates an oscillation signal at a frequency f₂ offset from a central frequency f₁ of a channel signal by an offset frequency Δf' a mixing unit 202 which mixes the channel signal and the offset oscillation signal; and a filter unit 203 which filters frequency signal mixed by the mixing unit 202.;COPYRIGHT: (C)2007,JPO&INPIT