Body-proximity effects on the input impedance of a complex-conjugate SWIPT textile rectenna

Wagih, Mahmoud, Weddell, Alex S. and Beeby, Steve (2022) Body-proximity effects on the input impedance of a complex-conjugate SWIPT textile rectenna. In IEEE Antennas and Propagation Symposium. IEEE. 2 pp . (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

While a range of Simultaneous Wireless Information and Power Transfer (SWIPT) rectennas were proposed for wearables, the human-proximity effects on a complex-conjugate matching network-free rectenna remain mostly unknown. This paper reports for the first time the impact of human proximity on a complex conjugate rectenna's impedance. The impedance of a dual-mode SWIPT microstrip/dipole rectenna is measured experimentally for varying separation from the body and on different body positions. The measured input impedance is used to simulate the rectifier's RF-to-DC efficiency using a non-linear model showing the effects of the power level, load, and frequency on the DC output for different on-body impedances.

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Wagih_APS22_SWIPT_ZBody - Accepted Manuscript

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Accepted/In Press date: 24 March 2022

Venue - Dates: 2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, , Denver, United States, 2022-07-10 - 2022-07-15

Keywords: SWIPT, rectenna, simultaneous wireless information and power transfer (SWIPT), antenna, wearable antenna, RF enregy harvesting, human proximity, antenna body coupling, impedance matching, complex conjugate, complex impedance, rectifiers, antenna rectifier co-design

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