Paper Title
Design of FSS based Microwave Absorber for Wideband Absorption Applications

Abstract
Microwave absorbers have critical significance due to widely extended applications in defence, EMC (electromagnetic compatibility)/EMI (electromagnetic interference) reduction, anechoic chamber, wireless communication, and different medical applications. Conventional electromagnetic (EM) absorbers have some constraints in practical domain. Instead, advanced FSS (frequency selective surface) absorbers offer a solution to these limitations by controlling the material permittivity and permeability. A planar FSS (frequency selective surfaces) broadband microwave (MW) absorber operating in the range of 8.508 GHz - 16.701 GHz, spanning over X & Ku frequency bands, has been proposed in this paper. The design is composed of FSS loaded with lumped resistors and Rogers RT 5880 as dielectric backed by copper layer. The optimized value of resistance has been set so that maximum absorption over a larger bandwidth could be achieved. Good angular stability is gained by extending operating angle up to 50°. The structure is simulated using CST (computer simulation technology) software which reveals a wideband absorption response of 8.193 GHz ranging from 8.508 to 16.701 GHz with centre frequency of 12.6045 GHz and varying value of absorptivity from 90% to 99.98%. Keywords - Planar FSS, Absorptivity, Angular Stability, Broadband Response