Waveguide to Coaxial Adapter
Waveguide to Coaxial Adapter converts signals between waveguide interfaces and coaxial connectors such as N, SMA, 2.92mm, 2.4mm, 1.85mm and 1.0mm, which up to 110GHz, Widely used in RF test systems, radar equipment, satellite communication and millimeter-wave measurement setups.
Precision Right-Angle Waveguide to Coaxial Adapters
AO Microwave’s right-angle waveguide to coaxial adapters provide transition from waveguide TE10 mode to TEM mode of coaxial lines. Designed for low-loss performance up to 110 GHz, our adapters are precision-machined from high-conductivity copper and lightweight aluminum alloys, finished with high-purity gold or silver plating to minimize skin-effect attenuation in high-frequency bands. By combining highly stable dielectric bead supports with robust connector options—including Type N and SMA for lower bands, 2.92mm (K) for Ka-band, and 2.4mm/1.85mm/1.0mm for millimeter-wave bands—these adapters secure a typical VSWR of < 1.15:1 and insertion loss of < 0.15 dB.
Whether you are routing RF signals from active transmitter lines, integrating low-noise amplifiers (LNAs) in satellite ground terminals, or configuring complex laboratory test benches, our adapters offer reliable electrical grounding and mechanical durability. Our standard designs cover full waveguide bands from WR-90 to WR-10, engineered to withstand thermal cycling and high-stress environments without performance degradation.
| Part No | Frequency/GHz | VSWR (Max) | IL/dB (Max) | Average Power/W (Max) | Flange Type | Connector Type |
|---|---|---|---|---|---|---|
| AO2300-WCANKPACG | 0.32-0.49 | 1.25 | 0.2 | 100 | UDR3 | N Female |
| AO2100-WCANKPACG | 0.35-0.53 | 1.25 | 0.2 | 100 | UDR4 | N Female |
| AO1800-WCANKPACG | 0.41-0.62 | 1.25 | 0.2 | 100 | UDR5 | N Female |
| AO1500-WCANKPACG | 0.49-0.75 | 1.25 | 0.2 | 100 | UDR6 | N Female |
| AO1150-WCANKPACG | 0.64-0.98 | 1.25 | 0.2 | 100 | UDR8 | N Female |
| AO975-WCANKPACG | 0.75-1.15 | 1.25 | 0.2 | 100 | UDR9 | N Female |
| AO770-WCANKPACG | 0.96-1.46 | 1.25 | 0.2 | 100 | UDR12 | N Female |
| AO650-WCANKPACG | 1.13-1.73 | 1.2 | 0.2 | 100 | UDR14 | N Female |
| AO510-WCANKPACG | 1.45-2.20 | 1.2 | 0.2 | 100 | UDR18 | N Female |
| AO430-WCANKPACG | 1.72-2.61 | 1.2 | 0.2 | 100 | UDR22 | N Female |
| AO340-WCANKPACG | 2.17-3.30 | 1.2 | 0.2 | 100 | UDR26 | N Female |
| AO284-WCANKPACG | 2.60-3.95 | 1.2 | 0.2 | 100 | UDR32 | N Female |
| AO229-WCANKPACG | 3.22-4.90 | 1.2 | 0.2 | 100 | UDR40 | N Female |
| AO187-WCANKPACG | 3.94-5.99 | 1.2 | 0.2 | 100 | UDR48 | N Female |
| AO187-WCASKPACG | 3.94-5.99 | 1.2 | 0.2 | 50 | UDR48 | SMA Female |
| AO159-WCANKPACG | 4.64-7.05 | 1.2 | 0.2 | 100 | UDR58 | N Female |
| AO159-WCASKPACG | 4.64-7.05 | 1.2 | 0.2 | 50 | UDR58 | SMA Female |
| AO137-WCANKPCSG | 5.38-8.17 | 1.2 | 0.3 | 100 | UDR70 | N Female |
| AO137-WCASKPCSG | 5.38-8.17 | 1.2 | 0.3 | 50 | UDR70 | SMA Female |
| AO112-WCANKPCSG | 6.57-9.99 | 1.2 | 0.3 | 100 | UBR84 | N Female |
| AO112-WCASKPCSG | 6.57-9.99 | 1.2 | 0.3 | 50 | UBR84 | SMA Female |
| AO90-WCANKPCSG | 8.20-12.5 | 1.2 | 0.3 | 100 | UBR100 | N Female |
| AO90-WCASKPCSG | 8.20-12.5 | 1.2 | 0.3 | 50 | UBR100 | SMA Female |
| AO75-WCANKPCSG | 9.84-15.0 | 1.2 | 0.3 | 100 | UBR120 | N Female |
| AO75-WCASKPCSG | 9.84-15.0 | 1.2 | 0.3 | 50 | UBR120 | SMA Female |
| AO62-WCANKPCSG | 11.9-18.0 | 1.2 | 0.3 | 100 | UBR140 | N Female |
| AO62-WCASKPCSG | 11.9-18.0 | 1.2 | 0.3 | 50 | UBR140 | SMA Female |
| AO51-WCASKPCSG | 14.5-22.0 | 1.2 | 0.3 | 30 | UBR180 | SMA Female |
| AO42-WCASKPCSG | 17.6-26.5 | 1.25 | 0.5 | 30 | UBR220 | SMA Female |
| AO42-WCA2.92KPCSG | 17.6-26.7 | 1.2 | 0.3 | 50 | UBR220 | 2.92mm Female |
| AO42-WCA2.4KPCSG | 17.6-26.7 | 1.2 | 0.3 | 30 | UBR220 | 2.4mm Female |
| AO34-WCA2.92KPCSG | 21.7-33.0 | 1.2 | 0.3 | 50 | UBR260 | 2.92mm Female |
| AO34-WCA2.4KPCSG | 21.7-33.0 | 1.2 | 0.3 | 30 | UBR260 | 2.4mm Female |
| AO28-WCA2.92KPCSG | 26.5-40.0 | 1.2 | 0.3 | 50 | UBR320 | 2.92mm Female |
| AO28-WCA2.4KPCSG | 26.5-40.0 | 1.2 | 0.3 | 30 | UBR320 | 2.4mm Female |
| AO22-WCA2.4KPCG | 33.0-50.0 | 1.25 | 0.35 | 30 | UG-383/U | 2.4mm Female |
| AO19-WCA1.85KPCG | 40.0-60.0 | 1.5 | 0.6 | 10 | UG383/UM | 1.85mm Female |
| AO15-WCA1.85KPCG | 50.0-75.0 | 1.8 | 0.8 | 10 | UG385/U | 1.85mm Female |
| AO12-WCA1.0KPCG | 60.0-90.0 | 1.55 | 1 | 10 | UG-387/U | 1.0mm Female |
| AO10-WCA1.0KPCG | 75.0-110.0 | 1.55 | 1 | 10 | UG387/UM | 1.0mm Female |
Understanding Backshort Cavity Tuning in Right-Angle Adapters
Right-angle adapters rely on a tuned resonant cavity behind the coaxial probe, known as the backshort cavity. The distance between the shorted backplate and the probe center is physically designed to be exactly one-quarter of the guide wavelength (λg/4) at the center operating frequency. This short-circuit reflects the reverse wave in phase with the forward wave, maximizing coupling efficiency into the coaxial connector.
At high millimeter-wave frequencies—such as the V-band (WR-15) or W-band (WR-10)—even a tiny machining error of ±0.02 mm in this cavity length will shift the optimum resonant point. This shift degrades performance at the band edges, causing VSWR spikes and increased insertion loss. AO Microwave uses precision sub-micron CNC milling to lock in this critical dimension, delivering flat return loss performance across the entire waveguide band.
Applications & Connector Selection
- Satellite Earth Terminals: Utilizing copper-bodied WR-28 to 2.92mm adapters to interface outdoor block upconverters (BUCs) with low-loss feed assemblies.
- Laboratory VNA Calibrations: Using precision gold-plated WR-15/WR-10 to 2.4mm/1.85mm adapters with robust connector tolerances to secure highly repeatable, low-VSWR calibration references.
- Aerospace Transceivers: Deploying lightweight, chromate-passivated aluminum WR-90 to Type N adapters in airborne radar receiver protection paths.
Waveguide to Coaxial Adapter FAQs
Need high-performance Right-Angle Waveguide to Coaxial Adapters?
Specify your WR size, connector interface (Type N/SMA/2.92mm/2.4mm), and flange style — we'll quote in 24 hours.
