Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 19, Issue 12, Pages 2216-2220Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2020.3027833
Keywords
Rectifiers; Impedance; Power measurement; Feeds; Microwave measurement; Microwave circuits; Integrated circuit modeling; Energy harvesting (EH); metamaterials; metasurface; rectifiers; wireless power transfer (WPT)
Funding
- National Research Foundation of Korea [NRF-2017R1C1B5018179]
- Office of Naval Research Global [N62909-19-1-2049]
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This letter presents a novel rectifying metasurface with high efficiency at low power applicable to wireless power transfer and energy harvesting. The proposed rectifying metasurface is a two-sided structure consisting of modified electric-inductive-capacitive unit cells on one side and a rectifying circuitry on the other, designed to resonate and rectify at 2.45 GHz. Each unit cell is directly connected to a voltage-doubler rectifier, allowing the incident microwaves to be directly rectified upon reception. The impedance characteristics and rectification performance of the proposed rectifying metasurface are tested via numerical simulation and measurement, respectively. The measured results demonstrate an overall conversion efficiency (electromagnetic power absorption + rectification) of 76.8% at 0.4 dBm incident power.
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