Wideband RCS reduction using three different implementations of AMC structures

Abstract

Here, two new AMC structures are presented with phase difference in wideband frequency of 4.97–17.15 GHz. Three implementations of two AMC structures are presented, which include periodic checkerboard structure, aperiodic checkerboard structure, and randomised structure. The periodic checkerboard structure is presented in two models. In the first model, the RCS is reduced > 9.6 dB in the frequency range of 9.3–16.9 GHz, which is equivalent to 58.02%. In the second model, the RCS is reduced >7.8 dB in the frequency range of 8.1–16.9 GHz, which is equivalent to 70.4%. The second model is analysed through FMB parameter, bistatic and monostatic RCS. For improving the RCS reduction bandwidth, the new aperiodic checkerboard structure and the optimal randomised structure are presented with bandwidth of 81.67 and 98.69%, respectively. In aperiodic and randomised structure, the reflected field is scattered more uniformly in many direction. Therefore, the 3D bistatic RCS pattern is improved greatly. For validating the result of simulation, the second model of periodic checkerboard structure is fabricated and RCS reduction is measured, which are in good agreement with simulation results.