A radio frequency identification (RFID) transponder (tag) includes a spiral over ground plane antenna. The RFID tag includes a RFID circuitry that may be implemented as an RFID tag integrated circuit and may be mounted on one surface of a substrate such as a printed circuit board. The RFID tag circuitry...http://www.google.de/patents/US6118379?utm_source=gb-gplus-sharePatent US6118379 - Radio frequency identification transponder having a spiral antenna
