WR-51 Waveguide to SMA Female Adapter – Ku/K-Band 14.5–22 GHz

WR-51 to SMA Female Adapter for Professional Ku/K-Band Applications

This WR-51 waveguide to SMA female coaxial adapter is designed to ensure a stable, precise and low-loss transition across the 14.5–22 GHz range, covering both the Ku-Band and the lower portion of the K-Band. It is a professional QAXIAL solution ideal for RF systems, microwave telecommunications, radar modules and high-frequency measurement setups.

The SMA female interface is the most widely used industrial standard up to 26.5 GHz, offering an excellent balance of precision, mechanical stability and cost efficiency. The UBR-180 square flange ensures complete mechanical compatibility with WR-51 waveguide interfaces, while the internal geometry is optimized to minimize insertion loss and maintain a low VSWR across the full operating band.

Reliable RF Performance from 14.5 to 22 GHz

In the Ku-band and the lower K-band region, machining accuracy, internal alignment and surface finishing are crucial to ensure stable and repeatable performance. Every QAXIAL adapter is manufactured using high-precision machining and strict dimensional controls, guaranteeing a dependable and consistent waveguide-to-coaxial transition in professional and industrial environments.

These characteristics make the WR-51 to SMA female adapter ideal for laboratory testing, RF front-end integration, Ku-band radar systems, microwave telecom links and high-frequency measurement applications.

Main Features

• WR-51 / Ku/K-Band 14.5–22 GHz with optimized performance
• SMA female connector suitable up to 26.5 GHz
• UBR-180 square flange compliant with WR-51 standards
• Low insertion loss and low VSWR
• High-precision mechanical construction and quality materials
• Compatible with RF instruments, systems and industrial test setups

Applications

• Microwave telecommunications in Ku-band (15–18 GHz)
• Ku/K-Band radar systems for sensing, tracking and imaging
• RF test benches with VNAs and instruments up to 22 GHz
• Point-to-point microwave links for high-capacity networks
• Industrial mmWave systems for control and diagnostics
• R&D and prototyping of Ku/K-band components
• Characterization of antennas, filters and active modules
• Integration into RF development and validation platforms

Designed for Professional Stability

The combination of the SMA connector, UBR-180 flange and precise mechanical construction ensures stable and repeatable RF behavior over time, even under frequent connection cycles or variable operating conditions. It is ideal for intensive measurement environments and continuous-operation RF systems.

Thanks to its build quality and compatibility with WR-51 architectures, this adapter is an excellent choice for telecom companies, system integrators, laboratories, universities and industrial users requiring reliable Ku/K-Band components.

Dedicated Technical Support

For complex applications or integration-specific needs, QAXIAL provides dedicated technical support. We can help select the most suitable adapter and evaluate custom variants to ensure maximum performance within the user’s system.