Impedance Matching for RFID Tag Antennas
نویسندگان
چکیده
Passive UHF RFID tag consists of a microchip attached to an antenna. Proper impedance match between the antenna and the chip is crucial in RFID tag design. It directly influences RFID tag performance characteristics such as the read range. It is known that an RFID microchip is a nonlinear load whose complex impedance varies with the frequency and the input power. We investigate the effect of using constant chip impedance while designing UHF RFID tags for specific frequencies. Commercial Avery Dennison AD-220 tag was simulated by Ansoft HFSS software. Afterwards, the read range of the tag was obtained numerically and compared with the measured values using the Voyantic Tagformance RFID measurements system.
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