Bandwidth properties of rectangular T-septum waveguides

The transmission line modeling (TLM) method is applied to rectangular T-septum waveguides for the determination of the separation between the hybrid TE₁₀ and hybrid TE₂₀ modes. While previous analysis have predicted a wider bandwidth for this class of waveguiding structure than is available with conventional ridged waveguide, they have not been in agreement on the exact bandwidth properties. This discrepancy is resolved, and the apparent cause of error in previously published results is pointed out. The results obtained are in agreement with those presented by G.G. Mazumder and P.K. Saha (1985)