Analysis and Design of Wideband Passive UHF RFID Tags Using a Circuit Model

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Executive Summary

The great majority of commercial UHF RFID tags are based on dipole antennas using a modification of a T-match as a matching circuit. The literature contains examples of wideband matching, but provides little insight as to how wideband behavior is achieved. Here, one presents a simple circuit-based theory to describe the antenna, matching circuit, and IC behavior; one presents an approach for developing an impeding matching strategy to maximize bandwidth; and one presents a concrete example and analysis using a Method of Moments (MoM) numerical solver. The results show very good agreement with theory.

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