Agilent/Keysight R85026A

The Agilent/Keysight R85026A is a WR-28 waveguide detector for RF power measurement across the 26.5 GHz to 40 GHz band. It converts incident microwave signals into AC or DC outputs compatible with network analyzer input stages, specifically the Keysight 8757. The detector operates in two modes: AC detection handles signals from +10 dBm to −50 dBm, while DC detection accommodates +10 dBm to −45 dBm.

Both modes produce a 27.778 kHz square wave output for direct analyzer interpretation.

Technical Specifications

• Frequency Range: 26.5 GHz to 40 GHz


• Waveguide Interface: WR-28


• AC Detection Range: +10 dBm to −50 dBm


• DC Detection Range: +10 dBm to −45 dBm


• Return Loss: 12 dB


• Frequency Response: ±1.5 dB


• Dynamic Accuracy: ±(0.3 dB + 0.03 dB/dB)


• Output Signal: 27.778 kHz square wave (both AC and DC modes)

Key Features

• Dual detection modes accommodate high and low power measurement scenarios


• 12 dB return loss minimizes signal reflection at the waveguide interface


• ±1.5 dB frequency response ensures consistent sensitivity across the operating band


• Compact, rugged design rated for extended environmental exposure


• Operating Temperature: +20°C to +30°C


• Operating Humidity: Up to 95%


• Operating Altitude: Up to 7,620 m

Typical Applications RF and microwave power characterization in telecommunications, aerospace, and research environments. System-level power audits and network analyzer measurements requiring stable, calibrated detection across the Ka-band spectrum.

Compatibility & Integration Designed expressly for the Keysight 8757 network analyzer. WR-28 waveguide connection standard. Operating manual and service documentation available. Product is obsolete with no identified direct replacement.