Wide Angle, Polarization Independent Metamaterial Absorber Unit-Cell for RCS Reduction and Energy Harvesting Applications
Résumé
In this paper, a new design of Metamaterial Absorber unit-cell is presented with a high absorption coefficient of 99.78% at 10 GHz. The numerical results show that the proposed unit-cell has constant performances regardless the polarization state of the incoming waves, a wide angle of absorption up to 70 • for TE polarized waves, and 80 • for TM, RHCP, LHCP polarized waves is achieved. Analytical circuit model has been developed to describe the matching process between the unit-cell and free space impedances. The monostatic RCS capability of 12 × 12 metasurface array has been proved numerically by full wave simulation showing more than 10 dB RCS reduction at normal and oblique incidences. Finally a metasurface array was fabricated and tested experimentally, the simulated and measured results are in good agreement in terms of absorption rate and bandwidth, expect a frequency shift in terms of resonance frequency.
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