Dual-band Polarization-Insensitive Metamaterial Absorber with Bandwidth-Enhancement at Ku-band for EMI/EMC Application

In this paper, a dual-band metamaterial absorber with bandwidth-enhancement at Ku-band is presented in microwave frequency range. The unit cell geometry comprises of two split ring resonators in the top surface of a metal-backed dielectric substrate. Simulation result shows that the structure has dual-band absorption response with one band lying in C-band and another in Ku-band with an enhanced bandwidth having full width at half maxima (FWHM) bandwidth of 1 GHz. The absorber is symmetric in design and shows polarization-insensitive behavior under normal incidence. It also shows high absorption (above 80%) for oblique incidence upto 45 degrees under TE polarization. The proposed structure has been fabricated and absorption is measured in anechoic chamber, which shows good agreement with the simulated response. The designed absorber is ultra-thin and appears to be potentially instructive for various EMI/EMC applications.