TRANSMISSION APPARATUS FOR RADIO FREQUENCY IDENTIFICATION, A RADIO FREQUENCY IDENTIFICATION READER COMPRISING THE SAME AND A RADIO FREQUENCY IDENTIFICATION APPARATUS INCLUDING THE READER, PARTICULARLY FOR INCLUDING PLURAL ANTENNAS

摘要

PURPOSE: A transmission apparatus for radio frequency identification, a radio frequency identification reader comprising the same and a radio frequency identification apparatus including the reader are provided to improve the performance of RFID by reducing a shadow region.;CONSTITUTION: A modulation unit(110) creates a transmission subcarrier signal having a period having different phases by including a transmission subcarrier signal of which phases vary depending on a time. An antenna unit transmits transmission subcarrier signals by being connected to the modulation unit. The phase difference between subcarrier signals is equal to or lower than phi and has the same range as or larger range than the phi. In addition, the phase difference is variable depending on time. The antenna units are connected to the modulation unit, and include antennas(121,122) that respectively transmit the transmission subcarrier signals.;COPYRIGHT KIPO 2010