Abstract
A broadband microwave absorber is designed using a two-layer periodic structure consisting of arrays of square metal patches and square loops. It has been shown through simulations and experiments that the bandwidth of the structure can be enhanced by combining several unit cells to form a subcell and adjusting the geometrical parameters within these subcells. Numerical results show that at least 10 dB of the incident power is absorbed over about 10% bandwidth by appropriately designing the dimensions of these sub-array elements. The physics of absorption is established through extensive simulations. Bistatic radar cross section measurements have been used to validate the performance of this broadband microwave absorber.
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