Robust cubature methodology for spectral integrals

We outline a robust, adaptive numerical cubature methodology to evaluate multidimensional spectral integrals of Green´s functions in planar-stratified media with arbitrary anisotropic and lossy layers. We focus attention on measures taken to robustly impart exponential-cum-algebraic convergence and suppress integrand oscillations. The proposed methodology ensures reliable, accurate results across a wide range of problem parameters (material parameters, etc.). Numerical results demonstrate robust convergence characteristics even for cases where standard evaluation schemes (e.g., Sommerfeld Integration Path) would perform poorly.