Title :
Low cost patch antenna for passive microwave tagging system
Author :
Fries, M.K. ; Vahldieck, R. ; Peter, R.
Author_Institution :
Lab. for Electromagn. Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
In this work, we present a novel patch antenna for a passive microwave tagging system operating in the ISM band (2.4-2.48 GHz). The tagging system is based on surface acoustic wave (SAW) technology, where the reading distance of several meters with low radiated power of the interrogating unit is combined with a passive transponder. the SAW tag reflects the interrogating signal with different time delays, thus no electronic circuitry is needed. The time and phase difference between the ´echoes´ uniquely characterizes a code, Such a read only tag consists of just an antenna connected directly to the SAW chip. During the identification process the tag antenna serves two purposes: as receiving antenna for the reader signal and as transmitting antenna for the reflected SAW-transponder signal.
Keywords :
UHF antennas; identification technology; microstrip antennas; receiving antennas; surface acoustic wave devices; transmitting antennas; transponders; 2.4 to 2.48 GHz; 2.45 GHz; ISM band antenna; SAW chip connected antenna; SAW tag; SAW-transponder; identification process; interrogating unit; low cost patch antenna; passive microwave tagging system; passive transponder; read only tag; receiving antenna; surface acoustic wave technology; transmitting antenna; Acoustic waves; Costs; Patch antennas; Receiving antennas; Reflector antennas; Signal processing; Surface acoustic waves; Tagging; Transmitting antennas; Transponders;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1219330
