Millimeter wave devices based on dielectric, ferrite and semiconductor waveguides

Dielectric waveguides (DW) are regarded as prospective transmission lines for the millimeter (MM) wavelength especially for short MM waves because of low loss and dimensional tolerance requirements as well as broader band compared with the traditional MM transmission lines. Presently there are about dozen types of DW. We investigated only rectangular cross section DW on low permittivity substrate or on metal substrate - image DW (IDW), and nonradiative DW. All these waveguides were made of low loss dielectrics, ferrites and semiconductors. Ferrite and semiconductor DW (FW and SW) allow us to realize electrically and optically controlled devices. The parameters of low loss dielectrics, ferrites and semiconductors used for DW, FW and SW fabrication are shown. The measurements of these parameters were carried out using beam waveguide spectroscopy methods. The results of the experimental study confirm the feasibility of the passive, nonreciprocal, optically and electrically controlled devices based on DW, FW, and SW with characteristics acceptable for practical applications. The devices can be realized both as separate subsystems and as parts of communication, measuring, testing, and other MM range systems.