Numerical study of randomly distributed wire based metamaterial absorber

In this article, randomly distributed wire based metamaterial absorber is designed and analyzed numerically in microwave frequency region. The metamaterial absorber is composed of randomly distributed metallic wire on lossy FR4 substrate backed with metallic plate. Twenty random coordinates are generated within a unit cell of absorber. Total forty wire elements are distributed, including twenty wires horizontally and twenty wires vertically, at these random coordinate in unit cell. The numerical result shows the bandwidth of absorber is 1.2 GHz and 2 GHz for 10 dB and 5 dB return loss respectively. The wire elements dimensions (width and thickness) are of 14 μm and 35 μm respectively. Observed multiple absorption peaks expected to correspond to the absorption modes excited by varied effective lengths of shortened randomly distributed metallic wires.