Design of a Broadband Double-layer Absorber Using a Resistive Ink Based on Frequency-selective Surfaces Arrangement

Abstract

The traditional way to enhance the absorption performance of absorbers is to optimize the structural parameters of the unit cell, taking no consideration of the coupling between units. Here, based on the first presented double-layer metamaterial absorber unit cell using resistive ink patterns printed on an FR-4 sheet, the impact of arranging the frequency selective surfaces within constrained units on the absorption performance is studied, providing a method to improve the absorption performance through absorption and phase cancellation of the unit cell by arranging frequency selective surfaces. The optimized double-layer absorber structure achieves over 90% absorption within 3.3~15.6 GHz with a small thickness of 10.05 mm, and exhibits a preferred absorption performance than the original one within the operating frequency band.