The Agilent/Keysight R281B is a precision waveguide-to-coaxial adapter that transitions WR-28 waveguide transmission lines to 50-ohm 2.4 mm coaxial connectors. Operating across 26.5 GHz to 40 GHz, it delivers low insertion loss and exceptional return loss performance, making it essential for RF/microwave test systems requiring bidirectional signal integrity across both waveguide and coaxial domains.
Technical Specifications
• Frequency Range: 26.5 GHz to 40 GHz
• Waveguide Standard: EIA WR-28 (MIL-W-85/3-009)
• Waveguide Flange: UG-599/U (MIL-F-3922)
• Coaxial Output: 2.4 mm male connector
• Return Loss: ≥ 18 dB (warranted for mated pairs)
• Insertion Loss: ≤ 0.3 dB
• SWR (Maximum): 1.3 (typical 1.13)
• Isolation: ≥ −50 dB
– Key Features
• Low-loss transition between waveguide and coaxial systems
• Minimal insertion loss maintains signal fidelity across the operating band
• High return loss ensures efficient impedance matching
• Bidirectional power transmission capability
• Mated-pair return loss warranty provides system-level confidence
– Typical Applications
• RF and microwave component testing and characterization
• Communication system integration and signal analysis
• Test set versatility for mixed waveguide/coaxial measurement environments
• Laboratory and field measurements in the Ka-band region
– Compatibility & Integration
The R281B integrates directly into test systems combining WR-28 waveguide and 2.4 mm coaxial measurement paths. Its standardized connectors and defined flange ensure compatibility with industry-standard test equipment while preserving signal integrity through both transmission line families.
