Influence of dielectric insertions on broadbandness of a «pure» wave conversion by the cascade of strip diaphragms

We optimize the cascades of strip diaphragms in a flat overmoded waveguide for the efficient power conversion of the wave TE_1,0 into the higher wave TE_M,0. The working frequency band of such devices is considerably increased due to the modifications resulting from useful spectral regimes and due to the influence of dielectric insertions between diaphragms. We also consider a situation, in which the dielectric transmutes an input of the device into the single-mode one.