Properties of the H-guide at microwaves and millimeter waves

Wave propagation in the H-guide is investigated theoretically and experimentally. Relations are derived for description of the field distribution and for calculation of the distribution constants of the single- and double-slab guide. Higher modes are studied. The height of the guide can be increased without introduction of undamped higher modes. The attenuation constants are calculated and analyzed for X-band and millimeter waves. Conduction and dielectric losses are considered. Radiation losses and the corresponding attenuation are calculated. The radiation can be arbitrarily reduced by increasing the height of the guide. The maximum transmitted power at electric breakdown is calculated. Experiments are discussed which confirm the theoretically obtained results. The overall results suggest modifications of the original structure and permit the conclusion that the guide is particularly suitable for the frequency range above 20 KMC.