Dielectric frame beam waveguide

A new type of beam waveguide is described which consists of a sequence of equispaced dielectric frames. This waveguide is derived from the Fabry-Perot open resonator with step rims along the edges of the mirrors. In comparison with the more common iris and lens beam waveguides, it presents advantages with respect to diffraction scattering and dissipation losses and in addition, is light-weight and compact. A model working at 35 GHz has been constructed and tested.