Coaxial Rotary Joint
Coaxial Rotary Joint allows continuous RF signal transmission between rotating and stationary structures. Commonly used in radar antennas, rotating surveillance systems and microwave communication equipment.
Precision Coaxial Rotary Joints for Continuous Rotational Routing
AO Microwave’s high-precision coaxial rotary joints are designed to transmit RF and microwave signals across continuously rotating mechanical interfaces with minimum loss. Built with rugged, passivated stainless steel housings, these joint assemblies incorporate precision-milled beryllium copper sliding contacts and high-grade ball bearings. Operating up to 40 GHz with standard SMA, Type N, and 2.92mm (K) connector options, our rotary joints achieve a low typical insertion loss of < 0.30 dB, VSWR under 1.25:1, and low insertion loss variation ("Wow") of < 0.05 dB across a 360-degree rotation.
These low-torque coaxial rotary joints are critical for rotating Satcom antennas, tactical radar pedestals, marine scanners, and airborne gimbals. They provide a highly stable and reliable RF path across rotating mechanical boundaries.
| Part No | Way | Frequency/GHz | VSWR (Max) | VSWR Ripple (Max) | IL/dB (Max) | IL Ripple/dB (Max) | Average Power/W (Max) | Peak Power/W (Max) | Connector Type 1 | Connector Type 2 |
|---|---|---|---|---|---|---|---|---|---|---|
| AO18G-CRJI100-NJK-IP65 | 1 Way | DC-18 | 1.5 | 0.05 | 0.6 | 0.1 | 100 | 1500 | N Male | N Female |
| AO18G-CRJI100-NKK-IP65 | 1 Way | DC-18 | 1.5 | 0.05 | 0.6 | 0.1 | 100 | 1500 | N Female | N Female |
| AO18G-CRJI20-SKK-L33.9 | 1 Way | DC-18 | 1.35 | 0.05 | 0.45 | 0.1 | 20 | 2000 | SMA Female | SMA Female |
| AO18G-CRJI20-SKK-L33.9S | 1 Way | DC-18 | 1.35 | 0.05 | 0.45 | 0.1 | 20 | 2000 | SMA Female | SMA Female |
| AO18G-CRJI20-SKK-L34 | 1 Way | DC-18 | 1.35 | 0.05 | 0.45 | 0.1 | 20 | 2000 | SMA Female | SMA Female |
| AO18G-CRJI30-SKK-IP40 | 1 Way | DC-18 | 1.4 | 0.1 | 0.6 | 0.1 | 30 | 3000 | SMA Female | SMA Female |
| AO18G-CRJU100-NKK-IP65 | 1 Way | DC-18 | 1.5 | 0.05 | 0.6 | 0.1 | 100 | 1500 | N Female | N Female |
| AO27G-CRJI20-2.92KK-L33.9 | 1 Way | DC-27 | 1.8 | 0.15 | 1 | 0.2 | 20 | 2000 | 2.92mm Female | 2.92mm Female |
| AO40G-CRJI20-2.92KK-L33.9 | 1 Way | DC-40 | 1.8 | 0.15 | 1 | 0.2 | 20 | 2000 | 2.92mm Female | 2.92mm Female |
| AO50G-CRJI3-2.4KK-IP40 | 1 Way | DC-50 | 1.7 | 0.1 | 0.9 | 0.1 | 3 | 15000 | 2.4mm Female | 2.4mm Female |
| AO5G-CRJII15-SKK-IP51 | 2 Ways | DC-5 | 1.30/1.50 | 0.05/0.10 | 0.30/0.50 | 0.10/0.15 | 15 | 1000 | SMA Female | SMA Female |
| AO4.5G-CRJII10-SKK-IP64 | 2 Ways | DC-4.5 | 1.20/1.50 | 0.05/0.20 | 0.25/0.50 | 0.05/0.15 | 10 | 1000 | SMA Female | SMA Female |
| AO4.5G-CRJII20-SKK-IP60 | 2 Ways | DC-4.5 | 1.20/1.50 | 0.05/0.10 | 0.25/0.45 | 0.05/0.10 | 20 | 500 | SMA Female | SMA Female |
| AO4.5G-CRJII20-SKK-IP60 | 2 Ways | DC-4.5 | 1.20/1.50 | 0.05/0.10 | 0.25/0.45 | 0.05/0.10 | 20 | 500 | SMA Female | SMA Female |
| AO4.5G-CRJII50-SKK-IP60 | 2 Ways | DC-4.5 | 1.20/1.45 | 0.05/0.10 | 0.25/0.45 | 0.05/0.15 | 50 | 1000 | SMA Female | SMA Female |
| AO4.5G-CRJLL20-SKK-IP51T1 | 2 Ways | DC-4.5 | 1.40/1.50 | 0.05/0.10 | 0.40/0.50 | 0.05/0.10 | 20 | 200 | SMA Female | SMA Female |
| AO4.5G-CRJUU20-SKK-IP51 | 2 Ways | DC-4.5 | 1.20/1.50 | 0.05/0.10 | 0.30/0.50 | 0.05/0.10 | 20 | 200 | SMA Female | SMA Female |
| AO40G-CRJII5-2.92KSK-IP51 | 2 Ways | DC-40/18 | 2.20/4.50 | 0.40/2.00 | 2.50/3.50 | 0.45/1.50 | 5 | 500 | 2.92mm Female | SMA Female |
| AO5G-CRJII20-SKK-IP51 | 2 Ways | DC-5 | 1.20/1.50 | 0.05/0.10 | 0.25/0.45 | 0.05/0.10 | 20 | 500 | SMA Female | SMA Female |
| AO5G-CRJII20-SKK-IP60 | 2 Ways | DC-5 | 1.20/1.50 | 0.05/0.20 | 0.25/0.50 | 0.05/0.10 | 20 | 500 | SMA Female | SMA Female |
| AO8G-CRJII10-SKK-IP60 | 2 Ways | DC-8 | 1.50/1.70 | 0.10/0.25 | 0.50/0.80 | 0.10/0.25 | 10 | 200 | SMA Female | SMA Female |
| AO8G-CRJII20-SKK-IP51 | 2 Ways | DC-8 | 1.50/1.70 | 0.10/0.25 | 0.70/0.90 | 0.10/0.25 | 20 | 200 | SMA Female | SMA Female |
| AO8G-CRJLL10-SKK-IP51 | 2 Ways | DC-8 | 1.30/1.60 | 0.15/0.25 | 0.40/0.90 | 0.15/0.25 | 10 | 200 | SMA Female | SMA Female |
| AO0.97G1.15G-CRJ3L300-NKK-IP51 | 3 Ways | 0.97-1.15 | 1.25 | 0.1 | 0.5 | 0.1 | 300 | 10000 | N Female | N Female |
| AO4G-CRJ3I15-NKK-IP65 | 3 Ways | DC-4 | 1.30/1.50 | 0.1 | 0.8 | 0.1 | 15 | 500 | N Female | N Female |
| AO5G-CRJ3I30-SKK-IP51 | 3 Ways | DC-5 | 1.40/1.50 | 0.05/0.10 | 0.50/0.70 | 0.10/0.15 | 30 | 200 | SMA Female | SMA Female |
| AO5G-CRJ4I30-SKK-IP51 | 4 Ways | DC-5 | 1.40/1.50 | 0.05/0.10 | 0.60/0.80 | 0.10/0.15 | 30 | 200 | SMA Female | SMA Female |
| AO5G-CRJ4I30-SKK-IP65 | 4 Ways | DC-5 | 1.40/1.50 | 0.05/0.10 | 0.60/0.80 | 0.10/0.15 | 30 | 200 | SMA Female | SMA Female |
| AO8G-CRJ4I10-SKK-IP51 | 4 Ways | DC-8 | 1.40/1.60 | 0.10/0.30 | 0.90/1.20 | 0.10/0.30 | 10 | 200 | SMA Female | SMA Female |
| AO2.2G2.4G-CRJ5L30-SKK-IP51 | 5 Ways | 2.2-2.4 | 1.5 | 0.15 | 1 | 0.3 | 30 | 200 | SMA Female | SMA Female |
| AO2.7G3G-CRJ5L100-NKSK-IP65 | 5 Ways | 2.7-3 | 1.35 | 0.1 | 0.70/0.60 | 0.15 | 100 | 10000 | N Female | SMA Female |
Precision Sliding Contacts & Low Torque
Coaxial rotary joints transmit high-frequency signals across a rotating mechanical interface. To maintain stable characteristic impedance across 360 degrees of rotation, the inner and outer sliding conductors must maintain continuous, reliable physical contact.
AO Microwave utilizes precision-milled, gold-plated beryllium copper contacts configured as concentric spring fingers. These contacts slide against a smooth inner pin, maintaining low contact resistance and preventing signal drops. High-grade ball bearings ensure smooth, low-torque rotation and minimize eccentricity, keeping the insertion loss variation ("Wow") low across the band.
Target Applications & Operational Advantages
By providing low insertion loss variation and high mechanical durability, our coaxial rotary joints enable stable performance in active systems:
COTM Tracking Platforms
Function: Transmits RF carrier signals across continuously panning and tilting satcom dish tracking axes.
Advantage: Exceptional mechanical durability ensures a long lifespan (>1 million rotations) under continuous movement on marine vessels or land vehicles.
Tactical Defense Radars
Function: Routes high-frequency signals across rotating radar pedestal axes.
Advantage: Passivated stainless steel housings and sealed bearings withstand extreme vibration, shocks, and wide operating temperature ranges.
Medical Diagnostic Gimbals
Function: Routes RF signals in rotating medical scanning gantries.
Advantage: Low rotational torque ensures smooth, quiet rotation and minimizes drag on precision positioning motors.
Coaxial Rotary Joint FAQs
Need high-durability Coaxial Rotary Joints?
Specify your connector interface (SMA/Type N/2.92mm), channel configuration, rotational speed (RPM), and torque limit — we'll quote in 24 hours.
