Study of Novel Design of Multi-Band and Broad-Band Metamaterial Microwave Absorber

Abstract

The artificially engineered materials termed as metamaterials (MMs) possess unnatural electromagnetic (EM) properties with μ < 0 and ε < 0 due to their geometrical and structural uniqueness. This resulted in diversified study of MMs from the GHz to THz range with one of the potential application as microwave absorber. In this chapter, a case study has been taken up with a unique design of a MM microwave absorber that exhibits multi-band as well as broad-band absorptance within 5GHz - 40GHz. The proposed structure consists of a square ring and a “+” shaped patch at its centre and the scaled “+” shaped patches at four corners. The proposed MM absorber exhibited absorptance peaks of 99.74%, 98.58%, 90.00%, 90.04%, 84.74%, and 94.94% at 6.33 GHz, 14.08 GHz, 28.92 GHz, 32.48 GHz, 33.84 GHz, and 37.69 GHz, respectively, with a broad-band lying within frequency range of 32 GHz to 37 GHz. The MM behavior is studied in terms of normalized matched impedance, effective permeability, and surface current distribution with potential application in stealth technology.