Agilent/Keysight 85027D

The Keysight 85027D is a precision directional bridge for accurate reflection measurements across RF and microwave systems. Engineered to interface with scalar network analyzers including the 8757, 8756, and 8755 series, this component delivers both AC and DC detection capability. It characterizes impedance and component performance from 10 MHz to 50 GHz using a single zero-biased modified barrier diode detector.

Technical Specifications

• Frequency Range: 10 MHz to 50 GHz


• Nominal Impedance: 50 Ohms


• Directivity: 36 dB (0.01–20 GHz), 32 dB (20–26.5 GHz), 30 dB (26.5–40 GHz), 25 dB (40–50 GHz)


• Test Port Match (SWR): <1.18 (0.01–16 GHz), <1.27 (16–30 GHz), <1.57 (30–40 GHz), typically <2.00 SWR (40–50 GHz)


• Internal Detector: Zero-biased modified barrier diode for reflection measurements; transmission detector available as optional addition


• RF Input Connector: 2.4 mm female


• Test Port Connector: 2.4 mm male


• Dimensions: 26 mm H × 124 mm W × 118 mm D


• Weight: 0.5 kg net (2.3 kg shipping)

Key Features

• Dual detection modes support both amplitude-modulated (AC) and unmodulated (DC) signal measurement


• AC detection operates with modulation by 27.778 kHz square wave signal


• Directivity remains above 25 dB across full 50 GHz measurement range


• Test port match optimized below 1.27 SWR through 30 GHz

Typical Applications

• Return loss and reflection characterization of RF/microwave components


• Impedance matching verification


• Device characterization sensitive to modulation effects


• Network analysis with scalar detection architecture

Compatibility & Integration The 85027D operates with Keysight 8757 series (AC and DC modes) and 8756/8755 series analyzers (AC mode). RF input requires sweep oscillator or synthesized sweeper source. Calibration accessories and 2.4 mm open/short standards supplied.