Application of the Inverse Fast Multipole Method to Antenna Array Analysis

The analysis of antenna arrays using the Method of Moments (MoM) is limited by the electrical size due to the high computational cost associated with the MoM. Fast numerical techniques such as H
²
-matrices with iterative solvers can be used to solve for larger arrays efficiently. However, direct solvers are preferred for array analysis due to the need to solve for many different excitation schemes. The Inverse Fast Multipole Method (IFMM), which provides a direct solution for an H
²
-matrix formulation, is proposed for antenna array analysis.