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Abstract
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A novel wideband three-layer chessboard-like structure is proposed to reduce the
radar cross section (RCS) of the radar target. This configuration is composed of
two artificial magnetic conductor (AMC) cells formed by two crossed ellipses with
different sizes in two cells. A desired 180 37 phase difference is achieved by
combining these unit cells and the measured 10 dB RCS-reduction bandwidth is
extensively broadened to more than 96% (from 8.11 to 23.32 GHz, covering X,
Ku, and K bands for different radars) in comparison with the other works. This
characteristic is obtained by carefully adjusting the positions of all resonances
using the proper sizes for the ellipses and the proper dielectric constants and thicknesses
for the three layers. Although, the proposed design has three layers with the
overall thickness of 2 mm, it is still thinner than most of the recent related works.
This low-profile structure is also cost-effective due to the fact that 60% of the overall
thickness is formed by an air substrate. The proposed cells are designed, simulated,
and fabricated in a chessboard-like configuration for both monostatic and
bistatic RCSs. Simulations and measurements are in a good agreement, which
shows the capabilities of the design.
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