A fractal-based compact broadband polarization insensitive metamaterial absorber using lumped resistors

In this article, a broadband polarization insensitive metamaterial absorber has been proposed for C-band (4-8 GHz) applications using lumped resistors. The unit cell of the proposed structure is based on an inverted Minkowski fractal loop, where four lumped resistors are mounted to obtain a broad absorption band at the expense of 5 mm thick dielectric substrate, which is only 0.033(0) with respect to the lowest operating frequency. The proposed structure is polarization insensitive and also wide angle absorptive. A prototype of the proposed structure has been fabricated, which is experimentally verified with the simulated responses. The designed structure is much compact compared with other reported structures due to its unique design and thus can be considered as a compact broadband absorber for C-band applications. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:343-347, 2016