Open AccessMulti‐polarisation electromagnetic energy harvesting with high efficiency
Author(s) -
Ghaderi Bagher,
Nayyeri Vahid,
Soleimani Mohammad,
Ramahi Omar M.
Publication year - 2018
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5011
Subject(s) - resonator , energy harvesting , resistor , electrical impedance , electromagnetic radiation , capacitive sensing , power (physics) , optics , acoustics , materials science , optoelectronics , physics , electrical engineering , engineering , voltage , quantum mechanics
This study presents a polarisation‐independent metasurface harvester composed of an ensemble of novel electric‐field‐coupled inductive‐capacitive (ELC) resonators. The ELC resonator has full symmetry in a way that its behaviour is highly insensitive to the polarisation of the incident wave. Loading the resonators with resistors (which model the input impedance of a power combining circuit in a harvesting system), it is shown that the metasurface absorbs the incident electromagnetic wave energy, with nearly unity harvesting efficiency, irrespective of its polarisation while simultaneously delivering the absorbed power to the loads. As a proof of concept, a metasurface harvester composed of a 9 × 9 resonator array working at 2.45 GHz was fabricated. Near‐unity harvesting efficiency of the metasurface was demonstrated using full‐wave numerical simulation for a wide range of polarisation angles. Laboratory tests showed strong agreement between the simulation results and the measurements.