Abstract
AbstractA thin and ultra wide‐bandwidth microwave absorber is demonstrated theoretically and experimentally through simple layering 2 square loop‐frequency selective surfaces (SL‐FSSs) with different geometries on a grounded dielectric substrate. The circuit parameters of the SL‐FSS inductance (L) and capacitance (C) are retrieved using the equivalent circuit model and are utilized in the design of the wide bandwidth absorber. The L and C values increase with increases in the unit cell dimension, and thereby the absorption frequency band can be controlled by the SL‐FSS geometries. The optimal control for the surface resistance of the SL‐FSSs and the spacer (assumed by air) thickness of the double‐layer absorber provide a 10 dB absorption bandwidth of 6.3–38.3 GHz with a total thickness of 6.4 mm. The free‐space measurement with the test samples fabricated by the screen printing process provides a still wide bandwidth of 5.6–30.8 GHz with the same total thickness.
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