Analysis of Broadband Electromagnetic Scattering Based on RFG-FFT with Cube Polynomial Inter/Extrapolation Method

To analyze the broadband scattering problem, an efficient RFG-FFT with cube polynomial inter/extrapolation method is presented. Due to its great performance for accelerating the matrix vector product, RFG-FFT is applied to solve electrically large problems. To overcome bottleneck of repeatedly constructing the impedance matrix at each frequency, the combined cube polynomial inter/extrapolation method is incorporated into the filling process of the impedance matrix. The high efficiency and accuracy of the proposed method are verified by a comparison with the numerical method.