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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 80 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).

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 Product Portfolio for Rotating Solutions

Hybrid Rotary Joints

Any combination is possible: integration of optical rotary couplings, slip rings for high-power or data transmission, media feedthroughs for air or other coolants, encoders, and digital contactless transmitters for Fast Ethernet and high-frequency signals.

RF Rotary Joints

Our RF rotary couplings provide low insertion loss, consistent transmission characteristics during rotation, and excellent crosstalk attenuation between channels across the full operating frequency range.

Fiber Optic Rotary Joints

Our optical rotary joints deliver signals with low insertion loss and high return loss at high speeds. We offer fiber optic rotary joints with up to 109 channels, as well as custom-designed optical rotary joints.

Contactless Rotary Couplings

Rotating, maintenance-free, contactless data and power transmission through optical and electronic rotary joints. Unlike slip rings, SPINNER rotary couplings are fail-safe and provide a long service life.