For an efficient calculation of scattering matrix in mode matching techniques, mode combination has been studied in this paper. A conducting post in rectangular waveguide, which is most commonly utilized in the combline filter structure, is adopted an...
For an efficient calculation of scattering matrix in mode matching techniques, mode combination has been studied in this paper. A conducting post in rectangular waveguide, which is most commonly utilized in the combline filter structure, is adopted and its scattering matrix is derived. We eliminates the TE and TM modes having little influence on result, which results in the different number of TE and TM modes in each discontinuous region.