Because coaxial parts are symmetrical in ø direction, free rotation without performance degradation is accomplished.
In the rotating part, electrical continuity is achieved by λ/4-chokes eliminating metal contacts.
The Rotary Joints can have both waveguide ports at a right angle to the rotational axis, "U-style", one waveguide port at a right angle and one in line, "L-style" or both waveguide ports in line.
Waveguide Rotary Joint modules are available for all frequency bands.
[1][2] Common materials for waveguide rotary joints include aluminum, brass, bronze, copper, and silver.