WR-42 to SMA Female Right Angle Waveguide to Coax Adapter, UBR-220, 17.6-26.7 GHz

WR-42 to SMA Female Adapter for Professional K-Band Applications

This WR-42 waveguide to SMA female coaxial adapter is designed to provide a stable, precise and low-loss transition across the 17.6–26.7 GHz range, covering the full K-Band. It is a professional QAXIAL solution ideal for RF systems, microwave telecommunications, radar front-ends and high-frequency measurement applications.

The SMA female interface is the most widely used industrial standard for applications up to 26.5 GHz, offering reliability, robustness and cost efficiency compared to more advanced mmWave connectors. The UBR-220 square flange ensures complete mechanical compatibility with WR-42 waveguide interfaces, while the internal geometry is optimized to minimize insertion loss and maintain a low VSWR across the entire band.

Reliable RF Performance in K-Band

Operating between 18 and 26 GHz requires careful control of internal finishing, mechanical alignment and connector stability. The WR-42 to SMA female adapter is manufactured using high-precision machining and strict dimensional checks, ensuring a stable, repeatable and reliable waveguide-to-coax transition even in critical professional or industrial environments.

With its solid RF performance, this adapter is ideal for laboratory measurements, radar system integration, microwave telecom equipment and professional RF applications.

Main Features

• WR-42 / K-Band 17.6–26.7 GHz with optimized performance
• SMA female connector suitable up to 26.5 GHz
• UBR-220 square flange compliant with WR-42 standards
• Low insertion loss and low VSWR across the band
• High-quality mechanical construction and durable materials
• Compatible with test equipment, RF systems and industrial setups

Applications

• K-Band radar systems for sensing, imaging and surveillance
• Microwave telecommunications including point-to-point and backhaul links
• RF measurement benches with VNAs up to 26 GHz
• Industrial mmWave systems for diagnostics, control and automation
• RF front-ends for WR-42 transmit/receive modules
• K-Band component characterization (antennas, filters, active modules)
• Microwave R&D in universities and research labs
• Integration into test benches for RF/microwave device validation

Designed for Stability and Professional Use

Due to its robust construction and the inherent stability of the SMA interface, this adapter guarantees reliable performance over time, even under frequent connection cycles or thermal variations. It is ideal for intensive use and environments requiring repeatability and precision.

The combination of mechanical quality, WR-42 standard compatibility and solid RF performance makes this adapter an excellent choice for integrators, laboratories, telecom companies and industrial applications requiring professional-grade K-Band components.

Dedicated Technical Support

For complex projects or specific integration needs, QAXIAL offers dedicated technical support. We assist in selecting the most suitable adapter and can evaluate custom configurations to ensure the highest performance within the user’s system.