Abstract
The design of a dual polarized metasurface collector based on the metamaterial full absorption concept for electromagnetic energy harvesting is introduced. Unlike previous metamaterial absorber designs, here the power absorbed is mostly dissipated across a resistive load rather than within the dielectric substrate. This is achieved by channeling the absorbed power to an optimal resistive load through a via hole. The simulation results show that a power absorption efficiency of 98% is achieved at an operating frequency of 2 GHz for a single unit cell. A super unit cell consisting of four cells with alternating vias was also designed to produce a dual polarized metasurface. The simulation results yielded a radiation to AC efficiency of around 98% for each polarization.
Highlights
The microwave energy harvesting system (MEHS) has recently received much attention in the field of developing rectenna arrays based on metamaterials [1]
The proposed independent polarized planer metasurface array is developed in a single-layer of 8 × 8 unit cells, which provides relatively high conversion efficiency
The simplicity and novelty of the developed polarization independent planer metasurface array is exhibited by using a single layer design and avoiding the use of dual layer structure with vias to connect the layers
Summary
The microwave energy harvesting system (MEHS) has recently received much attention in the field of developing rectenna arrays based on metamaterials [1]. The two main components of any microwave energy harvesting system are an antenna and a rectification circuit. The antenna is used for collecting incident electromagnetic radiated power and converting it to AC (Radiation to AC efficiency), whereas a rectification circuit is used for converting the collected AC power to DC (AC to DC efficiency) [2]. In the MEHS, the polarization and the direction of an incident electromagnetic wave are considered to be unknown, which, if they differ, can reduce the overall performance of the system due to the loss of the receiving polarization mismatch power [3,4]. In order to enhance the overall performance of the MEHS in terms of the total efficiency (Radiation to DC efficiency), the polarization of the antenna is to be considered as one of the fundamental factors for designing or synthesising the Wireless Power Transfer (WPT) system
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