Passive UHF RFID tags suffer from performance degradation when placed near conductors and high dielectric substances. Microstrip RFID tags offer a potential solution to find this metal-water problem associated with the passive UHF RFID tags.
However, their use is limited by narrow bandwidth, manufacturing complexity, because of, the need cross-layered construction and therefore cost. We present a new antenna and matching circuit design using balanced feed that eliminates any reference to ground, provides moderate gain and has broadband impedance matching for low cost metal-mountable RFID tags.
Source: University of Kansas
Author: Madhuri Bharadwaj Eunni
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