A Discontinuous Galerkin Multiregion Surface Integral Equation for Efficient Analysis of Coaxial-Fed Structures

The ubiquitous use of coaxial-fed structures in microwave engineering presents unique computational challenges due to their inherent multiscale characteristics. This work extends the discontinuous Galerkin integral equation (DGIE) method to coaxial-fed structures in conjunction with multiregion surface integral equations. The proposed method leverages flexible domain decomposition and enables independent discretization of coaxial ports and radiating elements. This approach simultaneously addresses two critical challenges: decoupling meshing constraints at feeding interfaces and eliminating the need for volumetric discretization of coaxial structures. Comparative studies with conventional surface integral equation (SIE) methods show substantial improvements in computational efficiency while maintaining solution accuracy. The technique exhibits particular advantages in modeling coaxial-fed antenna arrays, demonstrating promising potential for large-scale electromagnetic system analysis.