Title :
Compact ultrahigh-frequency antenna designs for low-cost passive radio frequency identification transponders
Author :
Tikhov, Y. ; Song, I.-J. ; Min, Y.-H.
Author_Institution :
Syst. LSI Div., Samsung Electron. Co., Ltd., Yongin
fDate :
10/1/2007 12:00:00 AM
Abstract :
Compact planar antennas for low-cost radio frequency identification (RFID) passive transponders are disclosed. The proposed ultrahigh-frequency antenna takes advantage of its unique topology to assure conjugate matching with essentially complex impedance of the electronic chip directly embedded into the radiator. Rectenna design issues are also emphasised. An original method to characterise IC chips and antennas as taken in its entirety of transponders is presented. The characterisation of the chip takes into account the impact of connecting antennas to the rectifier by flip-chip bonding process. The proposed experimental method allows finding chip impedance exactly as it seen by antennas. Refined rectifier circuitry effectively overcomes dependence of transponder performances on the type deviation of the connected antennas. Very good antenna performance is predicted theoretically and validated experimentally over an operating bandwidth of actual RFID systems.
Keywords :
UHF antennas; flip-chip devices; planar antennas; radiofrequency identification; rectennas; rectifying circuits; transponders; IC chips; RFID system; chip impedance; compact planar antennas; compact ultrahigh-frequency antenna designs; complex impedance; electronic chip; flip-chip bonding process; low-cost passive radio frequency identification transponders; rectenna design; rectifier circuits;
Journal_Title :
Microwaves, Antennas & Propagation, IET
DOI :
10.1049/iet-map:20070065