Abstract

In this paper, we propose an ultra-wideband dual-polarized metamaterial absorber (DMA), covering X band and Ku band. Metal strips with resistors are employed to combine the impedance matching layer and absorption layer into one. What's more, centrosymmetric structure is adopted to make DMA polarization insensitive, because incident beam in any direction can be decomposed into X polarization and Y polarization. Simulation results show that the absorber has a good absorption characteristic with absorptivity more than 90% from 7.9 GHz to 20.2 GHz, and the relative bandwidth is 87.5%. The thickness of the DMA is 3.55mm, about 0.093λ (wavelength at the lowest cutoff frequency), which is far lower than the thickness of 1/4λ of traditional absorbers. Considering the existence of resistance error, different resistors are simulated and it's shown from the results that the designed absorber has a high fault tolerance of 20% for the resistance error. A circuit model is presented to illustrate the principle of absorbing wave.

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