Design of low-scattering material based on two-dimensional zero backtracking method

This paper presents the design of a low-scattering material based on two-dimensional zero-backtracking method. Building upon the direction-backtracking characteristics of the traditional Van Atta array, the proposed material structure modifies the topology of the transmission lines to achieve phase inversion between adjacent antenna elements, resulting in phase cancellation of the reflected echoes and thereby reducing the backward RCS of the structure. Simulation results and testing in a microwave anechoic chamber demonstrate that, compared to a metal plate of the same size, the Structured material achieves approximately 10 dB reduction in RCS across most angles, with a peak reduction of up to 20 dB at the RCS null position, effectively decreasing RCS for two-dimensional incident waves, reflecting excellent low-scattering characteristic.