In the solution of free space antenna and scattering problems, two seemingly equivalent forms of the electric field integral equations are used. The first form is usually referred to as the mixed potential integral equation (MPIE) and the second, the field form or the dyadic Green's function form (DG-EFIE).

BBMM is a simple, fast multipole accelerated, electric field integral equation (EFIE) solver for free space electromagnetic scattering problems. The purpose of this project is to provide an easily accessible program to serve as a reference for students and researchers.

Under the hood, it uses the proven Rao-Wilton-Glisson basis functions with Galerkin testing for discretizing the EFIE. The resulting matrix equation is then solved iteratively using a Krylov subspace solver, such as the GMRES. The matrix-vector products are accelerated using a multi-level fast multipole method.