What is RF Rotary Joint?

RF rotary joint is the abbreviation of radio frequency, used to transmit radio frequency signals between rotor and stator parts in a rotary system. RF rotary joints can be divided into three types, coaxial rotary joints, waveguide rotary joints, and waveguide to coaxial rotary joints. The possible applications range from radar antennae to military, air traffic control, and space. It is often necessary to receive and send multiple-frequency signals.

RF Rotary Joints - HR Series

Available for Custom, DC-4.5, DC-18, 14-14.5 Frequency Rate(GHz)

GRAND HR Series RF rotary joints are designed according to the skin effect of high-frequency signals and the structure of the coaxial cable. Support single or multi-channel to transfer DC~18GHz RF signals, also can be integrated with electric and other signals. HF rotary joint high-frequency signal uses 50Ω characteristic impedance RF coaxial structure.

With almost 10 years experience of in high-frequency slip rings, and RF slip rings. GRAND offers rotary joints with compact design, excellent VSWR, low insertion loss, and minimal fluctuation.

Although GRAND offers modularized & standardized designs for various application solutions as an original slip ring manufacturer. To create your most suitable RF rotary joint connector, please feel free to contact us.


◆ Frequency: DC~18GHz

◆ Can be combine with power and signal transmission

◆ Low insertion loss and voltage standing wave ratio

◆ Support 1 or 2 RF channels


◆ Option for separate transfer single or multi channels high frequency signals

◆ Option for integrated transfer electric and HF signals

◆ Option for connector type

Model Breakdown


Frequency Rate(GHz)

No. of  RF Channels

No. of Electrical Rings































What is the Use of RF Rotary Joint?

RF Rotary Joints, often referred to within the industry as rotary couplings or swivels, are sophisticated electromechanical devices. They are typically used to transfer RF signals – a range of radio frequencies on the electromagnetic spectrum where electromagnetic waves are extensively applied for communication or radar signals – from stationary to rotating systems. As coupling devices, they are integral components in machinery handling the transmission of the RF energy while maintaining the rotational integrity of mechanical systems. To provide a deeper understanding, here are further elaborations on where these devices are typically used:

Radar Systems

In radar systems, RF Rotary Joints perform a pivotal role where antenna rotation is necessary to perform sweeping scans of a geographical area. Typically used in both ground-based and airborne radar systems, they allow for precise and clear data transmission of radar signals from the rotating antenna to stationary ground equipment.

Satellite Communication Systems

In satellite communication systems, RF Rotary Joints are vital in tracking satellites. Communication dishes need to move continuously to maintain lock with a specific satellite, or to move from one satellite to another. The RF Rotary Joint facilitates the transmission of RF signals between the stationary ground system and the moving antenna system.

Medical Equipment

In advanced medical technologies, like MRI machines, RF Rotary Joints are used to transmit signals while allowing relative movement between different parts of the equipment. This ensures a continuous imaging process without data interruption or loss.

Defense and Aerospace

For defense and aerospace applications, RF Rotary Joints ensure seamless communication and signal transmission in continuously rotating systems. They are used in a wide array of military equipment, including missile guidance systems, surveillance systems, and vehicular communication systems.

Industrial Applications

Various industrial scenarios involve rotating sensors or antennas that are used for measurement or communication purposes. Here, RF Rotary Joints are instrumental in fulfilling the accuracy requirements.

RF Rotary Joints are designed to provide consistent, high-quality, and low-loss connections in rotating systems. The kind of rotary joint used depends on factors including frequency range, power level, loss and VSWR requirements, mechanical constraints, and environmental conditions. Their complex designs and versatile functionality have positioned RF Rotary Joints as a fundamental component across industries where handling RF signals and ensuring operational efficiency is paramount.

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