Design of Low-RCS and gain enhancement microstrip antenna based on miniaturized polarisation-dependent AMC

In this paper, a novel miniaturized polarisation-dependent artificial magnetic conductor (AMC) is proposed. The proposed AMC element is based on the complementary split-ring resonators (CSRR) structure and via-based methodology. The electric size of one proposed element is as small as 0.09 λ
₀
× 0.09 λ
₀
. It can be used for radar cross section (RCS) reduction of microstrip antenna. For this purpose, chessboard configuration is structured with the orthogonal array of proposed elements. Compared with the reference element, the proposed element achieves 50% size reduction. Meanwhile, the performance of broadband RCS reduction and antenna radiation are well maintained.