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° 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.