Abstract
We present the idea and design of a dual polarized metasurface for electromagnetic energy harvesting. A 4 × 4 super cell with alternating vias between adjacent cells was designed to allow for capturing the energy from various incident angles at an operating frequency of 2.4 GHz. The collected energy is then channeled to a feeding network that collects the AC power and feeds it to a rectification circuitry. The simulation results yielded a radiation to AC and an AC to DC conversion efficiencies of around 90% and 80%, respectively. As a proof of concept, an array consisting of 9 super cells was fabricated and measured. The experimental results show that the proposed energy harvester is capable of capturing up to 70% of the energy from a planewave having various polarizations and converting it to usable DC power.
Highlights
Metamaterials can be made by assembling electrically-small resonators which can take different shapes and composite materials
We propose a dual polarized electromagnetic energy harvester using an array of Electric Inductive-Capacitive (ELC) resonators to form a metamaterial medium
Such feature is the key advantage to the current design and the main reason that enable metasurfaces to be an excellent candidate for electromagnetic energy harvesting
Summary
Metamaterials can be made by assembling electrically-small resonators which can take different shapes and composite materials. The fact that a metamaterial surface can be engineered to produce an effective medium having simultaneously negative permeability and permittivity has ignited a number of unprecedented applications in various frequency bands from acoustics[1,2] to the visible regime[3,4] Such applications include cloaking[5,6], energy harvesting[7,8,9,10], negative index of refraction[11], perfect lensing[12], and perfect absorption[13]. The unit cells are designed in such a way to produce a surface impedance matched to free space This can be achieved by tuning the μ and ε of the medium such that the refractive index is n = 1. The radiation to AC and the AC to DC conversion efficiencies of the array are studied numerically and experimentally
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