Double ridge waveguide rotary joint

摘要

An I type (straight) double ridge waveguide rotary joint is provided by connecting input and output sections of double ridge waveguide, oriented along a common axis, to opposite ends of a coaxial line rotary joint that is on the same axis. The input and output sections each connect to the coaxial line rotary joint by a transformer that connects one ridge to the center conductor of the adjacent coaxial line and the other ridge to the outer conductor of the coaxial line, the connections being made in several transitions to avoid an abrupt change of impedance in progressing along the axis through the transformer. In a preferred embodiment, the coaxial line rotary joint and the input and output double ridge waveguides all have air as the dielectric in the path of the high frequency waves and in that case, the transformer includes one section that begins as double ridge waveguide and progressively (in steps) changes to single ridge waveguide and meets an expanded coaxial line section that progressively (also in steps) changes to the coaxial line of the rotary joint; and so these transformer sections provide a gradual change of impedance along the axis between the double ridge waveguide and the coaxial line of the rotary joint and visa versa.