A fast IE-FFT algorithm with grid-robust higher order vector basis

In this paper, the integral equation — fast Fourier transformation (IE-FFT) with grid-robust higher order vector basis functions is presented. The magnetic field integral equation (MFIE) is used for solving scattering from three-dimensional closed perfectly electric conductor (PEC). Conformal mesh is required for traditional basis function based on common edges between adjacent elements. This is very rigorous requirement for large electrical, complicated geometry. Instead of conformal mesh, a grid-robust higher order vector basis function keeps the flexibility of geometry modeling. Further, the IE-FFT algorithm is used to accelerate the solution of MFIE. Compared with traditional RWG basis function, the present method has much lower error of interpolation, the filling process will be simpler.