A FAST MULTIPOLE APPROACH TO ANALYZE SCATTERING FROM AN INHOMOGENEOUSBIANISOTROPIC CYLINDRICAL OBJECT EMBEDDED IN A CHIRAL HOST

This paper presents a computationally efficient algorithm to compute o blique scattering from a bianisotropic object immersed in a chiral hos t. The analysis is performed in terms of Beltrami fields, as these for m a natural basis for representing waves in a chiral medium. Volume in tegral equations are derived solely in terms of the axial components o f the Beltrami fields and are discretized using pyramidal basis functi ons. The integral equations are solved iteratively using a fast multip ole accelerated method of moments technique with a computational compl exity of O(N-1.4) per iteration. A windowed translation operator is in troduced, which further reduces the computational complexity of the al gorithm to O(N-1.33). Our numerical results are validated against Mie- type solutions for anisotropic cylinders and shells. Results for scatt ering from large bianisotropic corrugated surfaces are presented.