Design of ultra-thin polarization-insensitive circular-shaped microwave metamaterial absorber

An ultra-thin polarization-insensitive circular-shaped metamaterial based absorber has been presented based on Electric field driven LC (ELC) resonance. The basic unit cell consists of a metallic ELC resonator imprinted on FR-4 dielectric substrate backed by copper ground, which gives rise to high (99.85%) absorption at 11.07 GHz. The proposed structure is symmetric by design and thus exhibits high absorption for any angle of polarization. It also shows high absorption (80%) for incident angle upto 50° for both TE and TM polarizations. The absorption due to LC resonance of the proposed structure has been analyzed by varying different geometric parameters.