A new approach for fast solution of electromagnetic scattering problems over a broad frequency band

A new adaptive algorithm based on the Maehly approximation theory is proposed to complete the scattering analysis over a broad frequency band. Firstly, the Chebyshev polynomial approximation for surface current is obtained by using method of moments at frequency points corresponding to the Chebyshev nodes. Secondly, the Chebyshev series are matched via the Maehly approximation to a rational function to improve the accuracy. Finally, an adaptive frequency-sweep analysis approach akin to the complex frequency hopping (CFH) technique is proposed to yield an accurate solution over the entire band.