HP / Agilent 85027E Directional Bridge, 10 MHz to 26.5 GHz

The HP/Agilent 85027E Directional Bridge is a precision reflection measurement instrument operating from 10 MHz to 26.5 GHz. It delivers high directivity and excellent test port match for accurate characterization of RF and microwave components. The bridge integrates directly with scalar network analyzers - supporting AC and DC detection modes on the Agilent 8757, and AC detection on the Agilent 8756 and 8755 - making it essential for return loss and reflection coefficient measurements across demanding test environments.

Technical Specifications

• Frequency Range: 10 MHz to 26.5 GHz


• Impedance: 50 ohms


• Test Port Connector: 3.5 mm male (SMA compatible)


• Detector Mode Support: AC and DC modes (8757); AC mode (8756, 8755)

Key Features

• High directivity for precision reflection measurements


• Excellent test port match minimizing measurement error


• 50 ohm impedance matching standard RF/microwave systems


• Dual detection capability supports both AC and DC measurement scenarios

Measurement Capabilities The 85027E measures reflection coefficients and return loss across its full frequency range. AC detection mode operates effectively in the presence of broadband noise and electromagnetic interference, while DC mode enables characterization of modulation-sensitive devices such as gain-controlled amplifiers.

Compatibility & Integration Compatible Scalar Network Analyzers:

Agilent 8757 (AC or DC detection)

Agilent 8756 (AC detection)

Agilent 8755 (AC detection) Operating and service manuals are available for installation, operation, and maintenance guidance.