A method of adjusting the 2-way communication range of an RFID system to assist a human operator to individually handle and interrogate a plurality of tagged objects, such as suitcases, that each include an RFID tag transceiver. An RFID interrogator transceiver is mounted on the human operator. The 2-way...http://www.google.com.hk/patents/US6097301?utm_source=gb-gplus-share專利 US6097301 - RF identification system with restricted range
