Passive and Lossless, Closed Metasurfaces for Illusion Electromagnetics

J. Budhu, L. Szymanski, A. Grbic
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Abstract

A two stage algorithm for the design and optimization of three-dimensionally contoured metasurfaces is presented. The first stage involves integral equation modeling and a moment method solution resulting in a local active/lossy design. The second stage involves optimization. It uses the gradient descent method and a semi-analytic gradient calculation using the adjoint variable method to obtain a non-local passive/lossless metasurface design with identical far field performance to the local active/lossy design. An example of an electromagnetic illusion is presented for a cubical metasurface which scatters the fields of a PEC sphere.
错觉电磁学的无源无损封闭超表面
提出了一种用于三维轮廓元曲面设计与优化的两阶段算法。第一阶段包括积分方程建模和矩量法求解,从而得到局部有源/有损设计。第二阶段涉及优化。采用梯度下降法和伴随变量法进行半解析梯度计算,得到了远场性能与局部有源/有损设计相同的非局部无源/无损超表面设计。给出了一个散射PEC球场的立方体超表面的电磁错觉的例子。
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