Modal spectrum of the ridged circular waveguide using the FE method

In this paper, results on the modal spectrum analysis of a Ridged Circular Waveguide (RCW) obtained with the Finite Element Method (FEM) are presented. The results obtained show that the RCW can be used in dual mode filters to eliminate the Tuning Screws unit traditionally required for this kind of hardware. First a brief theoretical discussion is presented with explanation of the mathematic algorithms used to solve the problem, then some of the results obtained are presented including the scalar potential distributions and the eigenvalues for both TE and TM modes in the RCW as obtained with the FEM analysis. The problems encountered are also discussed and finally an assessment of the numerical technique used is presented.