Mi-Waves’ 355 series rotary joints are available in standard circular waveguide sizes from 11.6 to 150 GHz. Each rotary joint consists of two circular waveguide sections mounted on ball bearings. Connections to the guides are made at standard male and female circular flanges. Precise alignment of the waveguide sections prevents spurious mode generation, and the very small gap between abutting surfaces contributes a negligible loss in the TE01 circular mode. In all models, amplitude variation with rotation is less than 0.2 dB and phase variation is less than 2 degrees.

Applications
The 355 series rotary joints provide efficient energy transfer in radar antenna systems or in other applications requiring
relative rotation between two sections of waveguide. Designed for low phase variation, low insertion loss, and low wow, they are also useful in special laboratory test set-ups for the measurement of millimeter wave parameters including phase variation in radiated fields. Operating in the low-loss TE01 circular mode, these rotary joints are designed for use in circular waveguide transmission lines.