Rotary joints are needed wherever signals have to be transmitted between a fixed platform and a second platform in continuous rotation. Such applications include traditional radar technology for air traffic control or anti-missile defence, medical engineering, V-Sat and SatCom technology as well as industrial applications like TV camera systems or cable drums that allow sensitive cables to be wound up without twisting them, thus increasing their reliability.

Special benefits of SPINNER rotary joints are their compact design, excellent VSWR and low insertion loss, low variation of transmission properties during rotation, and high crosstalk attenuation between the individual channels over the whole frequency range.

The wealth of experience that our engineers have with rotary joints in extraterrestrial use and our commitment to continuous product improvement are the basis of our great success.

When it comes to application in space, all major customers in Europe already trust in these rotary joints.

The inner and outer conductors of stator and rotor are DC coupled. These rotary joints are used for broadband applications. If a coaxial structure is used, the cut-off frequency depends on the diameter of the coaxial line. In some cases, specially designed slip rings can be used at lower frequencies.

RF signals can be transmitted via axial and radial coupling structures. Non-contacting solutions have an excellent lifetime and are used for narrow band transmissions.
Additionally, with special coupling structures, two different bands can be transmitted within one module (e.g. X- and L-Band).

Highly integrated radar systems with radio frequency (RF) amplifiers right behind the rotating antenna often require access to cooling liquid. Media joint solutions, that transport cooling liquid or simply air through the joint to cool of active components, are available for integration as well.