Surface Integral Equation With Multibranch RWG Basis Functions for Electromagnetic Scattering From Dielectric Objects

• Published in: IEEE antennas and wireless propagation letters Vol. 21; no. 12; pp. 2337 - 2341
• Main Authors: Li, Ziwei, Chen, Xinlei, Dong, Zhiwen, Gao, Fan, Xu, Bingzheng, Gu, Changqing
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Basis functions; Dielectrics; electric current and magnetic current combined field integral equation (JMCFIE); Electromagnetic scattering; Finite element method; Impedance; Integral equations; Iterative methods; Mathematical analysis; Mesh generation; Multibranch Rao–Wilton–Glisson (MB-RWG) basis function; multiscale objects; Surface impedance; Testing
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2022.3192627

A surface integral equation method with multibranch Rao-Wilton-Glisson (MB-RWG) basis functions for scattering from dielectric objects is proposed based on the electric and magnetic current combined field integral equations (JMCFIE). The MB-RWGs are defined at the boundaries between dense and coarse meshes and can keep the current continuity. Thus, the JMCFIE with MB-RWGs allows different surfaces of the dielectric models to be independently discretized by triangles with different sizes. Compared with the conventional JMCFIE, the JMCFIE with MB-RWGs increases the flexibility of mesh generation, which is attractive for multiscale dielectric models. Furthermore, the iterative convergence of JMCFIE with MB-RWGs is similar to that of conventional JMCFIE. Numerical examples are presented to demonstrate the advantages of the proposed method.