A Hybrid Ewald-Spectral Cavity Green’s Function Boundary Element Method With Spectral Domain Acceleration for Modeling of Over-Moded Cavities

A hybrid Ewald-spectral cavity Green´s function (CGF) boundary element method (BEM) with spectral domain acceleration is presented. In contrast to all previous work on the CGF BEM, the presented method relieves the two major drawbacks of the CGF approach: 1) the high-frequency complexity is decreased using a hybrid Ewald-spectral representation of the CGF and 2) the costly evaluation of the interaction integrals is accelerated with a fast group spectral domain approach. Results demonstrate that cavities containing small, medium-sized, and large objects are efficiently modeled over a wide frequency range.