The HP/Agilent 85027D is a directional bridge for precision reflection measurements spanning 10 MHz to 50 GHz. It integrates with scalar network analyzers (HP 8757, 8756, 8755) to enable S-parameter, impedance, and return loss characterization across RF and microwave frequencies. The bridge uses a single zero-biased modified barrier diode detector and delivers directivity ranging from 25 dB to 36 dB depending on frequency band, with test port match (SWR) better than 1.27 across the upper measurement range.
Technical Specifications
• Frequency Range: 10 MHz to 50 GHz
• Impedance: 50 Ω
• Directivity:
– 36 dB (0.01 to 20 GHz)
– 32 dB (20 to 26.5 GHz)
– 30 dB (26.5 to 40 GHz)
• Test Port Match (SWR):
– <1.18 (20 to 26.5 GHz)
– <1.27 (26.5 to 40 GHz)
• Detector: Single zero-biased modified barrier diode
• Connectors: RF Input 2.4 mm (female); Test Port 2.4 mm (male)
• Weight: Approximately 5 lbs
– Key Features
• AC and DC detection modes (DC mode available with HP 8757 only)
• Dual-mode operation accommodates both AC-only analyzers (8756, 8755) and dual-mode analyzer (8757)
• Configuration switch enables model-specific compatibility
• Facilitates ratio measurements when paired with HP 11667C power splitter
• Supports broadband noise and EMI measurements in AC mode
– Measurement Capabilities
• Reflection measurements
• S-parameter characterization
• Impedance analysis
• Return loss quantification
• Single-port and two-port device evaluation
– Compatibility & Integration
• Scalar Network Analyzers: HP/Agilent 8757 (AC/DC), 8756 (AC), 8755 (AC)
• Accessories: Compatible with HP 11667C power splitter (DC to 50 GHz)
