An Investigation of Dielectric Loaded Ridged Waveguide.
Final rept. Jun 81-Dec 84,
NAVAL RESEARCH LAB WASHINGTON DC
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The single mode bandwidth of any waveguide is the cutoff frequency ratio of the first higher order mode and the principal, or dominant, waveguide mode. Ridged waveguide may be designed to achieve a much larger single mode bandwidth than conventional rectangular waveguide, but suffers from a drastic decrease in peak power breakdown. Dielectric slab loaded rectangular waveguide also is capable of large single mode bandwidths. However, the aspect ratio of the latter waveguide must be reduced if the single mode bandwidth criterion is used, with a corresponding reduction of peak power breakdown. In this report, a complete modal analysis is made for ridged waveguide partially loaded with dielectric. Cutoff frequency calculations are derived for the different waveguide modes to provide the actual single mode bandwidth. Mathematical solutions for propagation characteristics, both phase and loss, and for peak power breakdown levels are derived for the dominant mode. It is shown that true TE or TM modes do not exist in the dielectric loaded ridged waveguide, contrary to the assumption made in the only published analysis of such waveguide. Numerical examples are cited to demonstrate the large single mode bandwidths that may be achieved with dielectric loaded ridge waveguide and the considerable increase in theoretical peak power breakdown levels over that of either empty ridged waveguide or dielectric slab loaded rectangular waveguide having the same single mode bandwidth. Author
- Electrical and Electronic Equipment