基于特征基函数的柱面共形吸波超材料的优化设计

针对吸波超材料与柱面载体共形时其吸波性能变差的问题，提出了一种非均匀单元方案及其优化设计方法.在柱面共形设计中，根据吸波超材料在无曲率变化方向上的周期性建立周期边界条件.基于特征基函数法的子块划分个数通过周期边界条件进行压缩，降低了矩阵方程求解维度，提高了优化设计速度.通过遗传算法优化，得到一组非均匀单元设计参数，并进行加工和实测.仿真和实测结果表明，所设计的非均匀单元方案改善了柱面共形对吸波超材吸波性能的影响，在2.8~8.0GHz频段内实现了良好的雷达散射截面积减缩特性.

Design of Cylindrical Conformal Composite Absorbing Metamaterial via Characteristic Basis Function Method

The absorption performance is going to decline when the composite absorbing metamaterial is in conformity with a cylindrical carrier.A non-uniform structure for conformal composite absorbing metamaterial and its optimization design is proposed to improve the wideband absorbing property.The periodic boundary conditions are established based on the periodicity in the direction of no curvature change.The number of sub-blocks parted by the characteristic basis function method is compressed by the periodical boundary conditions,and the dimension of the inverse of impedance matrix is also reduced to accelerate the optimization.A prototype is fabricated and measured with the optimized parameters given by genetic algorithm.The simulated and measured results show the proposed conformal absorbing material improves the influence of the cylindrical conformal and reduces the radar cross section in 2.8~8.0GHz for different polarized incidence.