Agilent/Keysight 85027B

The Keysight 85027B is a precision directional bridge for RF and microwave scalar reflection measurements across the 10 MHz to 26.5 GHz band. This 50 ohm instrument delivers high directivity and excellent test port match, enabling accurate characterization of components and systems with Keysight scalar network analyzers including the 8757, 8756, and 8755 series platforms.

Technical Specifications

Frequency Range: 10 MHz to 26.5 GHz Impedance: 50 ohms Directivity:

• 40 dB typical from 0.01 to 20 GHz


• 36 dB from 20 to 26.5 GHz Test Port Match (SWR):


• <1.15 from 0.01 to 8.4 GHz


• <1.43 from 8.4 to 20 GHz


• <1.78 from 20 to 26.5 GHz Insertion Loss:


• 6.5 dB at 10.0 MHz


• 8.0 dB at 18.0 GHz


• 10.0 dB at 26.5 GHz Maximum Input Power: +23 dBm or +10 Volts Typical Minimum Input Power (40 dB Return Loss): +2 dBm at 18 GHz Connectors: 3.5 mm female (RF input and test port)

Key Features

• Dual detection capability supports both AC and DC signal modes depending on analyzer configuration


• Compact form factor: 26 mm H × 124 mm W × 118 mm D, 0.5 kg net weight


• Superior directivity performance maintains measurement accuracy across extended frequency coverage


• Test port match performance scaled across operating band minimizes reflection uncertainty

Typical Applications

• Component reflection and return loss characterization


• System impedance matching verification


• Cable and connector quality assessment


• Filter and amplifier reflection measurements

Compatibility & Integration Operates with Keysight scalar network analyzers: 8757 series (AC/DC detection modes), 8756 series (AC detection mode), and 8755 series (AC detection mode). Supplied with 3.5 mm male open/short standard, male-to-male adapter, and male-to-female adapter.