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Abstract
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A novel double-layer chessboard-like configuration is proposed to reduce radar cross-section (RCS) in microwave
and mm-Wave bands. This structure is composed of two artificial magnetic conductor cells. One of these cells consists of four
square patches on substrate and the other one is formed only by substrate without any copper on it. Despite the simple design
of this structure, it has a big influence on significantly expanding the bandwidth of RCS reduction (RCSR). In comparison with
the other works, the measured bandwidth of 10 dB RCSR is broadened to 113.33% (16.43–59.4 GHz). This wideband behaviour
is achieved by effectively controlling the ratio between two dielectric constants and the ratio between their thicknesses and so
the effective dielectric constant which adjusts the positions of all resonances. Although this structure contains two layers, its
overall thickness is 1.4 mm, which is less than the ones that the recent works have. Measurements and simulations are
performed for both monostatic and bistatic RCSs with the best number of the unit cells in the chessboard-like structure. The
design, simulations, semi-analytical expressions and fabrication are presented and the measurements show an excellent
agreement with the simulations.
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