Agilent/Keysight 85023A

The Agilent/Keysight 85023A is a precision directional bridge for reflection measurements in RF and microwave applications. It enables accurate characterization of components and systems by isolating and measuring signal reflections in network analysis workflows. The 85023A operates across 500 kHz to 1.3 GHz with 50 Ohm impedance and N(f) connectors, delivering directivity exceeding 35 dB across its standard frequency range.

Magnitude response remains below 0.9 dB to 1.3 GHz, with phase stability within ±10 degrees. Reflection performance reaches ±1.8 dB magnitude and ±10 degrees phase from 4 MHz to 1.3 GHz. Optional H26 extends operation to 2.6 GHz, reducing directivity to greater than 30 dB and expanding phase tolerance to ±15 degrees, with reflection magnitude controlled to 3 dB maximum.

Technical Specifications

• Frequency Range: 500 kHz to 1.3 GHz (standard); 4 MHz to 2.6 GHz (with Option H26)


• Characteristic Impedance: 50 Ohms


• Connector Type: N(f)


• Directivity: >35 dB to 1.3 GHz; >30 dB to 2.6 GHz (Option H26)


• Magnitude Response: <0.9 dB to 1.3 GHz


• Phase Response: ±10 degrees to 1.3 GHz; ±15 degrees to 2.6 GHz (Option H26)


• Reflection Magnitude: <±1.8 dB (4 MHz to 1.3 GHz); <3 dB (to 2.6 GHz with Option H26)


• Reflection Phase: ±10 degrees (4 MHz to 1.3 GHz); ±15 degrees (to 2.6 GHz with Option H26)

Key Features

• Precision directional coupling for isolation of incident and reflected signals


• Broad frequency coverage with optional high-frequency extension


• Tight magnitude and phase stability for repeatable measurements


• High directivity ensures accurate reflection coefficient determination

Typical Applications

• Network analyzer reflection measurements


• Component and system characterization


• RF and microwave circuit analysis

Compatibility & Integration Designed for integration with Agilent/Keysight network analyzers. Forms part of the 8502A Transmission Test Set. Note: Product is obsolete; support availability through Keysight Service Centers or authorized third-party providers.