Spinner RF Rotary Joints

SPINNER rotary joints excel with compact designs, excellent VSWR, low insertion losses, minimal fluctuation of transmission characteristics while rotating, and high crosstalk attenuation between individual channels across the entire range of frequencies used.

With over 70 years of experience in the field of high-frequency technology, SPINNER is able to develop and supply rotary joints in any desired combination. They include fiber-optic rotary joints, joints for transmitting high power or large data volumes (e.g. via slip rings), and joints with integrated passages for media. The results can also be described as hybrid rotary joints. We also repair and service rotary joints of all makes.

The possible applications for RF rotary joints range from radar systems for air traffic control (ATC), military, weather monitoring, medical devices across V-Sat and satcom and space applications. RF signals are transmitted between mobile and stationary components. It is often necessary to simultaneously send and receive signals of multiple frequencies; we offer both standardized and customer-specific multi-channel rotary joints for this.

Non-contacting rotary joints

Non-contacting RF rotary joints (RJ) are available in coaxial and waveguide designs for frequency ranges up to 100 GHz. They are characterized by an especially long service life. Signal transmission is possible at a bandwidth of about 20% of the highest transmitted frequency. Non-contacting rotary joints are used for narrow-band transmission. With special coupling structures, the same module can also be used to transmit two different frequency bands (e.g. the X and L bands).

Non-contacting rotary joints
A three channel RJ with encoder, one channel waveguide RJ, two channel waveguide/coax RJ

Contacting Rotary Joints

In contacting rotary joints, the inner and outer conductors of the stator and rotor are DC-coupled.The maximum frequency depends on the diameter of the coaxial line. These coaxial rotary joints are used for broadband applications, allowing signal transmission in the frequency range from DC up to 92 GHz. Specially designed slip rings can also be used in some cases for low frequencies. Depending on the unit size, contacting systems of this type can transmit signals from DC up to 120 MHz.

 
SPINNER RF rotary joints contacting
Coaxial contacting rotary joint with SMA and N connectors

Interface Styles

The interfaces are available in I, U and L styles. These differ in the orientation of the input and output connections of a rotary joint (at the rotor and stator). In the I style, both are aligned with the rotational axis, in the U style both are perpendicular to the rotational axis, and in the L style one is perpendicular to the axis while the other is aligned with it.

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