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2021-05-19

Optimization of the Wheeler Cap Technique for Efficiency Measurement of RFID Antennas Matched to Complex Loads

By Nadeen Rishani, Jean-Marc Laheurte, Stephane Protat, and Raed Shubair
Progress In Electromagnetics Research Letters, Vol. 98, 25-31, 2021
doi:10.2528/PIERL21040207

Abstract

This paper proposes an improved mathematical formulation of Johnston's approach to measure the radiation efficiency of an antenna, based on the Wheeler Cap (WC) technique. The proposed modifications allow the measurement of the radiation efficiency of small antennas matched to complex loads implemented on Radio Frequency IDentification (RFID) tags. The studied structure is a low-cost, silver-printed, differentially-fed RFID dipole antenna. The antenna is printed on a flexible PET (polyethylene terephthalate) paper that is conformable on various objects. Link budget measurements validate the accuracy of the formulation, which can be applied to any dipole antenna matched to an RFID chip with a complex input impedance.

Citation


Nadeen Rishani, Jean-Marc Laheurte, Stephane Protat, and Raed Shubair, "Optimization of the Wheeler Cap Technique for Efficiency Measurement of RFID Antennas Matched to Complex Loads," Progress In Electromagnetics Research Letters, Vol. 98, 25-31, 2021.
doi:10.2528/PIERL21040207
http://jpier.org/PIERL/pier.php?paper=21040207

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