Threaded Stainless Steel High Pressure Coaxial Rotary Joint

Description

A Coaxial Rotary Joint, also known as an RF rotary joint or microwave rotary coupler, is a precision-engineered device that enables the continuous transmission of radio frequency (RF) and microwave signals between a stationary and a rotating structure without signal loss or distortion.

These components are essential for radar systems, satellite communications, antenna positioning systems, and surveillance equipment, where a reliable 360° rotational connection is required to maintain uninterrupted signal flow.

Crafted with high-conductivity materials and precision bearings, each unit ensures low VSWR, minimal insertion loss, and outstanding phase stability—ideal for demanding RF and microwave applications.

How It Works

A coaxial rotary joint functions as an electromechanical interface that transfers high-frequency RF signals across a rotating boundary.

The inner and outer conductors maintain coaxial alignment through precision bearings and dielectric support structures.
As the joint rotates, the electrical contact between the stationary and rotating sections remains stable, ensuring low return loss and high phase consistency.

Key Features

360° Continuous Rotation:

Enables seamless RF signal transmission between fixed and rotating assemblies.

Low VSWR and Insertion Loss:

Ensures optimal signal integrity, minimizing power reflection and loss.

Wide Frequency Range:

Operates efficiently across frequencies from DC to 50 GHz, covering L-band, X-band, Ku-band, and Ka-band.

Precision Machined Construction:

Made from high-grade stainless steel or aluminum alloy, ensuring excellent durability and corrosion resistance.

Multiple Channel Options:

Available in single-channel and multi-channel (dual or triple passage) configurations for complex communication systems.

High Power Handling Capability:

Designed to manage high RF power levels while maintaining electrical isolation and mechanical stability.

Customizable Interface:

Supports standard connectors (SMA, N-Type, TNC, 2.92mm, 2.4mm, or custom flanges) for integration flexibility.

Environmental Reliability:

Suitable for both indoor laboratory and outdoor military or aerospace conditions, with optional IP-rated sealing.

Types of Coaxial Rotary Joints

There are multiple variations of coaxial rotary joints designed for specific frequencies and operational demands.

Single-Channel Coaxial Rotary Joint

Transfers one RF signal through a single coaxial line.
Compact design suitable for standard antenna or radar applications.

Dual-Channel Coaxial Rotary Joint

Enables two independent RF channels, often with different frequency bands.
Used in radar systems that require simultaneous transmission and reception.

Multi-Channel (Hybrid) Rotary Joint

Combines RF, DC, and data transmission channels.
Supports complex systems like satellite tracking or ground communication terminals.

High-Frequency Rotary Joint

Operates in Ku-, Ka-, and V-band frequencies up to 50 GHz.
Requires ultra-low VSWR and precision alignment.

Custom Rotary Joint Assemblies

Integrate RF + Ethernet + Power + Fiber within a single rotating interface.
Ideal for robotic and radar systems that need multi-signal rotation.

Applications

Coaxial rotary joints are indispensable in systems that demand rotating communication paths for high-frequency signals.

Radar Antennas

Transmit radar signals between stationary transmitters and rotating antenna dishes.

Satellite Communication Systems:

Maintain continuous RF signal flow between ground stations and rotating antenna pedestals.

Surveillance and Tracking Systems:

Used in pan-tilt camera units and target tracking systems requiring 360° rotation.

Aerospace and Defense Equipment:

Support high-frequency data transfer in airborne radar and naval communication systems.

Medical Imaging (MRI/CT Systems):

Enable RF transmission between rotating imaging gantries and stationary control electronics.

Telecommunication Test Systems:

Used in RF testing setups requiring dynamic antenna movement or automated rotation.

Broadcasting Equipment:

Allow signal transmission in rotating microwave links and camera mounts.

Materials and Construction

Each coaxial rotary joint is CNC-machined from high-quality stainless steel or aluminum alloy, ensuring high conductivity and corrosion resistance.
The inner conductor is typically made from silver-plated copper to minimize resistive losses, while dielectric supports are composed of PTFE (Teflon) or Rexolite to maintain stable impedance across wide temperature ranges.

Material Highlights:

• Stainless Steel: Excellent strength, ideal for outdoor/military use.
• Aluminum Alloy: Lightweight for airborne or space-limited systems.
• PTFE Dielectric: Low-loss insulation for high-frequency performance.
• Gold or Silver Plating: Enhances conductivity and corrosion resistance.

Why Choose Our Coaxial Rotary Joints

• Expert Engineering: Designed and optimized by RF specialists for superior performance.
• Quality Manufacturing: CNC machining ensures precision tolerances and repeatable performance.
• Competitive Pricing: Comparable quality to major brands at cost-effective prices.
• Fast Delivery: Stock available for standard models; quick lead time for custom builds.
• Global Support: Technical assistance and after-sales service for worldwide customers.

FAQ

Q1: What is the main difference between a coaxial rotary joint and a waveguide rotary joint?

A: A coaxial rotary joint supports broadband, flexible RF frequencies and is smaller in size, while a waveguide rotary joint handles higher power and narrower bandwidths.

Q2: Can coaxial rotary joints be used outdoors?

A: Yes. Models with IP65–IP68 sealing are designed for outdoor or marine environments, resisting humidity, dust, and salt corrosion.

Q3: What is the maximum rotation speed supported?

A: Standard units support up to 100 rpm. Custom designs can achieve higher speeds for specific tests or antenna systems.

Q4: Are multi-channel designs available?

A: Absolutely. We provide dual and triple channel models combining RF, power, and data transmission in a single housing.

Conclusion

A Coaxial Rotary Joint is the cornerstone of any rotating RF system, providing uninterrupted, high-frequency signal transmission between stationary and moving components.

Engineered with precision and reliability, these devices are essential in modern communication, defense, and radar applications.

Whether you need a standard single-channel rotary joint or a custom multi-channel hybrid solution, our products ensure superior electrical performance, rugged mechanical durability, and optimized system integration.