Ansys Fast Solver Technology

Moment method (MoM)-based tools have always required long computation times and large amounts of computer memory. The MoM matrix solution-time typically increases by n³, where n is the number of unknowns, while the MoM matrix memory-requirement increases by n². Green’s-function calculations and matrix-accumulation times are typically not limiting factors. For practical antenna array analysis, the rapid increase in solution time and memory requirements limits the size of an array that can be studied (to approximately 32 elements).

Ansys MoM Fast Solve technology enables the analysis of larger structures than previously possible. The Ansys Electronics Desktop (AEDT)^TM electronics systems design platform uses a new, proprietary algorithm to significantly reduce the memory needed to store and solve the MoM matrix. The algorithm analyzes the electromagnetic characteristics of the structure to determine the different levels of coupling between regions. In many cases, where electromagnetic interaction between regions is low, reduced-order coupling matrices can be employed to accurately capture the electromagnetic effects. The reduced-order coupling matrices save large amounts of memory compared to the full MoM coupling sub-matrices. In many cases, the memory requirements can be reduced by a factor of 15 or more compared to classical MoM methods.

The matrix solution time can also be reduced by employing advanced preconditioning algorithms and iterative solvers on the reduced order MoM matrix.