HIGH ORDER EXTRACTIONS OF BROADBAND GREEN'S FUNCTION WITH LOW WAVENUMBER EXTRACTIONS FOR ARBITRARY SHAPED WAVEGUIDE

In this paper we develop a higher order extraction method to accelerate the convergence in the computation of broadband Green’s function (BBGFL) for an arbitrary shaped homogeneous waveguide.The broadband Green’s function is based on modal expansions in which the modal field solutions are frequency independent. The higher order extraction is obtained by using three low wavenumbers in extraction. It gives a modal expansion of Broadband Green’s Function with 6th order convergence requiring fewer evanescent modes for convergence. Numerical results are illustrated for both lossless and lossy dielectric cases. The accuracy of results are verified with direct method of moment (MoM) and HFSS. The higher order BBGFL method is computationally efficient for broadband simulations.