Fast frequency sweeping technique based on AIM-PO hybrid method

A new fast frequency sweeping technique hybridized with the adaptive integral method (AIM)-physical optics (PO) is proposed for wide-band response analysis. The AIM-PO is an efficient technique for modeling the large-scale structure with small features. However, the calculation of the response over a broad frequency band is very time-consuming. To achieve fast frequency sweeping, the Chebyshev approximation technique (CAT) is combined with AIM-PO through the expansion of the unknown equivalent currents into a Chebyshev series. Compared with the direct point-by-point simulations, much less Chebyshev sampling points are required. Therefore, the proposed AIM-PO-CAT method can significantly reduce the computational time without loss of accuracy.