SPINNER S Band Rotary Joints for Use in Space
SPINNER has expanded its range of rotary joints for use in space, primarily in antenna pointing mechanisms. Many of the rotary joints already available for use in space operate in the X, K or Ka band, and SPINNER has now also developed units for the S band.
Based on its proven contactless RF transmission technology, SPINNER has surmounted the challenges involved in designing and producing S Band rotary joints that are comparable in size to those for higher frequencies, despite the longer wavelength. Thanks to their small dimensions, as well as the use of special aluminum alloys and other materials specifically designed for use in space, each entire rotary joint weighs less than a total of 100 grams.
The S band rotary joints can handle average power of up to 10W with a maximum VSWR of 1.15 and a maximum VSWR variation over rotation of 0.05. The insertion loss is very low at up to 0.25dB, while the insertion loss variation over rotation doesn’t exceed 0.05dB. These values are guaranteed at full performance across a very wide temperature range from -100° to +120°C.
Thanks to their small size and excellent transmission properties, these joints permit very flexible design of antenna pointing mechanisms, and the frequency range can be adapted as required. This opens up even more possibilities for direct communication between satellites and base stations and greatly expands the scope for designing satellites.