The HP/Agilent 85021A is a precision microwave directional bridge for reflection coefficient and return loss measurement from 10 MHz to 18 GHz. It delivers directivity exceeding 40 dB above 40 MHz and maintains 40 dB at 18 GHz, enabling accurate characterization of microwave components across demanding test environments. The instrument integrates a single zero-bias Schottky diode detector for direct return loss measurement and accepts signals up to +23 dBm at its Type-N female input. Its APC-7 test port provides a stable, well-defined reference for reflection measurements. The compact, ruggedized housing (15 mm H × 110 mm W × 96 mm D) fits laboratory benches and field installations alike.
Technical Specifications
• Frequency Range: 10 MHz to 18 GHz
• Nominal Impedance: 50 ohms
• Directivity: 36 dB (10–40 MHz), >40 dB (above 40 MHz), 40 dB (18 GHz)
• Maximum Input Power: +23 dBm
• Input Connector: Type-N Female
• Test Port Connector: APC-7
• Detector: One zero-bias Schottky diode (integrated)
• Dimensions: 15 mm H × 110 mm W × 96 mm D
– Key Features
• Single integrated Schottky diode detector measures return loss directly
• Transmission measurements supported with external detector addition
• Ratio measurements enabled using external power splitter
• Compact, rugged package supplied in instrument case
– Typical Applications
• Reflection and return loss characterization across UHF, microwave, and millimeter-wave bands
• Component impedance and mismatch assessment
• Network analyzer-based reflection measurements
• System integration and field testing
– Compatibility & Integration
Designed for HP 8757A, 8756A, and 8755C Scalar Network Analyzers. Compatible with HP 8350B Sweep Oscillator or 8340A Synthesized Sweeper when paired with external detectors such as the HP 11664A. Supports IEEE-488 and IEC-625 interfacing via compatible analyzers. ESD-sensitive microcircuits require standard electrostatic protection during handling and service.
