Design of a Compact Circular Metamaterial Absorber with Unsymmetrical Slots for Energy Harvesting Applications

Abstract

This paper presents the compact, circular-shaped metamaterial absorber with unsymmetrical slots for RF energy harvesting applications in the radio frequency range of 2.45 GHz. The aim of this absorber design is to design a compact unit cell with enhanced performance which regards to bandwidth, absorption, and return loss. FR4 material is used as the substrate which has a dielectric constant of 4.4 with the thickness 1.6 mm. The simulation of the absorber design was carried out in the high-frequency structure simulator (HFSS) tool. The designed absorber gives the maximum simulated bandwidth in the 2.45 GHz frequency range. The simulated results show an improved absorption rate of 99.99%, reduced size of 10 mm × 10 mm, bandwidth of 1 GHz, and return loss of −20 db while comparing with the previous related works.