Multibranch Schaubert–Wilton–Glisson Basis Functions for Electromagnetic Scattering Problem

In this communication, a multibranch Schaubert–Wilton–Glisson (MB-SWG) basis function is proposed for solving volume integral equations (VIEs) involved in electromagnetic scattering problems. MB-SWG is defined on several tetrahedrons in the positive and negative parts that share a common triangular face, replacing two tetrahedrons in the traditional Schaubert–Wilton–Glisson (SWG) basis function. The MB-SWG basis function is convenient for domain decomposition with a coarse mesh scheme in one subdomain and a fine mesh scheme in the neighboring domains. Numerical results confirm the accuracy and versatility of the MB-SWG basis functions applying for dielectric scattering problems.