Abstract
Proposed is an indirect coupling method for designing an RFID tag antenna, which can not only achieve broadband operation, but can also conveniently implement a complex conjugate impedance match between an antenna and an RFID chip. An equivalent circuit model of the proposed coupling method is presented to characterise the performance of the antenna. An example is included to demonstrate the coupling method for an antenna with half-power bandwidth of approximately 16% (840-985 MHz), and which covers the entire UHF RFID frequency band. Estimated and simulated results are shown to be in good agreement with measured ones.
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