مشخصات پژوهش

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.