In recent developments the transmission lines used for millimeter-waves propagation are, usually, non shielded dielectric waveguides which present parasitic radiation in the discontinuities. Nevertheless, long time ago, the H-waveguide was proposed (1) for this purpose, because of its decreasing conductor losses with increasing frequency. On the other hand, some works ((2) and (3)) aiming to the design of isolators and differential phase-shifters show that multi-H waveguide is a good transmission line for this purpose. But, age neralized use of a type of transmission line needs of a complete knowledge of the propagation behaviour (guided wavelength, conductor and dielectric losses and characteristic impedance). This paper presents some computed results for these performances and the application to the design of a broadband launcher from standard rectangular waveguides to these ones.
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