Agilent/Keysight Q85026A

The Agilent/Keysight Q85026A is a waveguide detector engineered for RF and microwave power measurement across the 33 to 50 GHz band. It operates in both AC and DC detection modes, delivering dynamic accuracy of ±(0.3 dB + 0.03 dB/dB) across a wide input power range. The detector terminates in a WR-22 waveguide connector (UG-383) and integrates directly with the Keysight 8757 series network analyzer and associated test systems.

Technical Specifications

• Frequency Range: 33 GHz to 50 GHz


• Detector Type: Waveguide


• Input Connector: WR-22 Waveguide (UG-383)


• Cable Length: 1.22 m (48 inches)


• AC Mode Power Range: +10 dBm to –45 dBm


• DC Mode Power Range: +10 dBm to –40 dBm


• Maximum Input Power: +20 dBm


• Return Loss: ≥ 12 dB


• SWR: ≤ 1.67


• Frequency Response: ±1.5 dB


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


• Flatness: ±1.5 dB

Key Features

• Dual detection modes (AC/DC) for flexible measurement configurations


• Wide dynamic range spanning 55 dB in AC mode


• Excellent return loss performance ensures minimal signal degradation


• Matched SWR specification enables accurate power transfer and reduced reflections


• Integrated 1.22 m cable assembly for field deployment

Typical Applications

• Network analyzer measurements in the Ka-band


• Power calibration and verification in microwave test setups


• RF system characterization in telecommunications infrastructure


• Aerospace and defense signal measurement and analysis

Compatibility & Integration Designed as a system component within the Keysight 8757 series ecosystem, the Q85026A operates alongside complementary waveguide components including attenuators, isolators, and power sensors optimized for the same frequency band.