Agilent/Keysight Q281A

The Agilent/Keysight Q281A is a coaxial-to-waveguide adapter that transforms WR-22 waveguide transmission lines into 50 ohm coaxial systems across the Q-Band frequency range. This precision adapter bridges high-frequency waveguide and coaxial architectures, enabling signal transfer in either direction while maintaining strict impedance and return-loss specifications. Engineered for demanding RF characterization work, the Q281A delivers the electrical performance required in R&D labs, advanced engineering facilities, and production test environments where signal integrity directly impacts measurement accuracy.

– Technical Specifications

• Frequency Range: 33 GHz to 50 GHz (Q-Band)
• Waveguide Standard: EIA WR-22 (MIL-W-85/3-013)
• Flange Type: UG-383/U (MIL-F-3922/67B-013)
• Coaxial Connector: 2.4 mm female
• Characteristic Impedance: 50 ohm
• Maximum SWR: 1.3 across full band
• Dimensions: 6 × 4 × 4 inches
• Weight: 0.7 lbs

– Key Features

• Bidirectional power transmission capability
• Full Q-Band coverage (33–50 GHz) with specified SWR performance
• Low return loss across operating frequency range
• Compact form factor suitable for bench and integrated test setups

– Typical Applications

• Component and subsystem characterization in the Q-Band
• Waveguide-to-coaxial interface for network analyzer and signal source connections
• High-frequency measurement and tuning operations
• Integration into test fixtures requiring precision impedance matching

– Compatibility & Integration

The adapter mates WR-22 waveguide systems with 2.4 mm coaxial connectors, enabling direct integration into existing 50 ohm measurement infrastructure. Its fixed frequency band and connector configuration ensure mechanical and electrical alignment with standard Q-Band waveguide components and laboratory coaxial equipment.