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Wideband electromagnetic absorber based on array of parallel-plate waveguide

We present a novel absorber based on a periodic array of parallel-plate waveguide. With the assistance of a layer of lumped circuit that consists resistors, capacitors on top the parallel-plate waveguide, the absorber designed working at microwave L, and S band performs high absorption in a broadband frequency range. The reflectivity of −10dB covers the frequencies 1.4–5.5 GHz with relative absorption bandwidth about 120% in single polarization mode. An equivalent circuit model is proposed to analyze the broadband absorption performance and to be used for a parametric analysis. Further, the absorber is designed working in dual polarization modes for which the absorption bandwidth covers 1.9–4.7 GHz. The absorber features lower profile with thickness of 1/10 of the wavelength at the lowest operating frequency.