Patent ID: 8154402

Claim:
A wireless sensor network comprising: a plurality of passive wireless transponder units, each transponder unit including wireless communication circuitry, said transponder units being positioned at dispersed locations; each transponder unit including address decoder circuitry storing a unique identity code and operative to recover an address code from a received wireless query signal and to compare a recovered address code with said unique identity code; each transponder unit including parameter sensor circuitry adapted to measure a particular parameter and to cause said communication circuitry to wirelessly transmit a reply signal including parameter data corresponding to a measured parameter value upon reception of said query signal including an address code matching said unique identity code; and a wireless base station positioned in spaced relation to said transponder units, periodically transmitting said query signal and cyclically addressing each of said transponder units with a corresponding address code, receiving said reply signal from each of said transponder units, and extracting said parameter data from each reply signal for storage in a data file.