Agilent/Keysight 11866A

The Agilent/Keysight 11866A is a reflectometer bridge test fixture that performs reflection measurements across microwave frequencies using a resistive Wheatstone Bridge architecture extended to RF/microwave operation. The instrument incorporates two Schottky diode detectors to sample incident and reflected signals, enabling high-directivity measurements with external ratioing for isolation from source mismatch effects.

Technical Specifications

• Frequency Range: 40 MHz to 18 GHz


• Input SWR: 1.92


• Maximum Input Power: +15 dBm


• Connectors: Type N-Female (input/output); APC-7 optional


• Weight: 0.7 kg net / 2.26 kg shipping


• Measurement Principle: Resistive Wheatstone Bridge with microwave frequency extension


• Directivity: High equivalent directivity achievable over wide bandwidths; measured with 50-ohm termination

Key Features

• Dual Schottky diode detectors for simultaneous incident and reflected signal sampling


• High directivity performance across 40 MHz to 18 GHz bandwidth


• Effective external leveling via ratioing technique - isolates measurement port from source/bridge input mismatch


• Compact form factor enabling integration into diverse test setups


• Optional 116641 Detector compatibility for simultaneous dual-ratio measurements of insertion and return loss

Typical Applications

• High-volume production testing of RF/microwave components


• Laboratory reflection coefficient and return loss characterization


• Research and development environments requiring stable, repeatable reflection measurements

Compatibility & Integration Designed for dedicated operation with the Agilent 8755 reflectometer. Optional APC-7 connector configuration available for systems requiring this interface.