An SRR based microwave absorber

In this letter, the authors present the design of a resonant microwave absorber made by a proper array of split ring resonators (SRRs). The physical mechanism behind the operation of the proposed component is based on the SRR resonance, arising when the structure is excited by a properly polarized impinging wave. A resistive sheet, located nearby the resonating SRRs, absorbs the electromagnetic energy of the incoming field, without destroying the resonance condition of the SRRs. The two relevant features of the proposed absorber are its electrical thickness, which is very small compared with the operating wavelength, and the lack of a metallic backing, which represent a common part of conventional absorber layouts. The full-wave simulations presented in the paper confirm the effectiveness of the proposed absorber for microwave applications.