Rotary transmission system using a waveguide

A high speed datalink rotary joint

• comprising:
• a first ring with a first diameter and a second ring with a second diameter that is larger than the first diameter,
• the first ring being coaxially arranged to the second ring and around a center axis to form a gap between the rings,
• the first ring and the second ring comprising at least partially conductive material, the rotary joint further comprising a first antenna and a second antenna rotatable relative to the first antenna,
• the first antenna being directed into the gap in a first direction and at a first angle, the second antenna being directed into the gap in a second direction opposing the first direction and at a second angle, and
• wherein each of the first angle and the second angle is defined relative to a radial direction of the center axis and has an absolute value in a range from 0° to 90°,
• wherein each of values of the first angle and the second angle is a fixed value and remains over rotation,
• wherein an absolute value of the first angle is larger than a width of a beam of the first antenna measured at a half-power level and/or an absolute value of the second angle is larger than a width of a beam of the second antenna measured at a half-power level.