Design of a Thin Broadband Metamaterial Absorber Based on Resistance Frequency Selective Surface
Keywords:
Broadband absorber, multiple resonant, resistive frequency selective surfaceAbstract
A thin broadband metamaterial absorber with Resistive Frequency Selective Surface (RFSS) is presented. The absorber maintains a good performance over a broad operating frequency band with low profile. It is designed by a class of periodic artificial electromagnetic structures and the unit cell of the proposed absorber is composed of resistively loaded square loops with different sizes. By combining multiple resonant square loops (MRSL) of different geometries on a single layer structure, the absorption spectrum is greatly expanded. Simulation results show that the absorption coefficient is greater than 85% from 7.9GHz to 18.9GHz, while the thickness of the whole structure is 0.1λ (the free space wavelength) at the lowest operation frequency. A prototype was fabricated and measured in an anechoic chamber to validate the proposed design method. Favorable agreement among the full-wave simulation result and measurement result was achieved.
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