Polarization-Insensitive Broadband Multilayered Absorber Using Screen Printed Patterns of Resistive Ink

Abstract

Design and implementation of a broadband polarization-insensitive multilayered microwave absorber using resistive ink has been presented here. The proposed absorber is constructed using layers of resistive surface where each layer consists of periodic arrangement of resistive patterns printed on a low-cost FR4 sheet using resistive ink. Due to the multilayered nature, the proposed absorber shows broadband absorption having simulated reflection coefficient less than $-$ 10 dB in the frequency range from 2.00 to 18.50 GHz under normal incidence, which covers the entire S, C, X, and Ku bands with the smallest thickness of 0.082 $\lambda _L$ (at lowest operating frequency of the absorption band) as compared to the state-of the-art absorbers. In order to validate the proposed absorber, the equivalent circuit model has also been presented. The equivalent circuit model shows good match with the proposed absorber. The proposed absorber is experimentally verified and the experimental results shows good agreement with the simulated results.