An iterative algorithm is adopted to construct approximate representations of matrices describing the scattering properties of arbitrary objects. The method is based on the implicit evaluation of scattering responses from iteratively generated excitations. The method does not require explicit knowledge of any system matrices (e.g., stiffness or impedance matrices) and is well-suited for use with matrix-free and iterative full-wave solvers, such as FDTD, FEM, and MLFMA. The proposed method allows for significant speed-up compared to the direct construction of a full transition matrix or scattering dyadic. The method is applied to the characteristic mode decomposition of arbitrarily shaped obstacles of arbitrary material distribution. Examples demonstrating the speed-up and complexity of the algorithm are studied with several commercial software packages.

翻译：采用迭代算法来构建描述任意物体散射特性的矩阵的近似示意图,这种方法基于对迭代产生的引言的散射反应的隐含评价,该方法不要求明确了解任何系统矩阵(如僵硬或阻力矩阵),完全适合用于无基体和迭代全波解答器,如FDTD、FEM和MLFMA。拟议方法与直接构建全面过渡矩阵或散射三角体相比,可以大大加快速度。该方法用于任意物质分布的任意形成障碍的典型模式分解,用几个商业软件包研究显示算法速度加快和复杂性的实例。