A radio frequency identification transponder has a high gain antenna for increased range. In an embodiment, the radio frequency transponder has a reflector to increase its operative range. A system of one or more reflectors is operatively associated with a transponder and may be formed out of any sort...http://www.google.com.tw/patents/US6320509?utm_source=gb-gplus-share專利 US6320509 - Radio frequency identification transponder having a high gain antenna configuration
