Keysight (Agilent) 8473C Low-Barrier Schottky Diode Detector

The Keysight 8473C is a low-barrier Schottky diode detector engineered for precision RF and microwave power measurement across 10 MHz to 26.5 GHz. Built for signal detection, power sensing, and frequency response characterization in communication and radar systems, the detector delivers high sensitivity and stable performance across demanding frequency ranges. Its LBSD technology enables broadband operation with minimal insertion loss and consistent impedance matching.

– Technical Specifications

Frequency Response
• ±0.3 dB to 12.4 GHz
• ±0.6 dB to 20 GHz
• ±1.5 dB from –3.3 dB linear slope beginning at 20 GHz to 26.5 GHz

Impedance & Connectors
• Input impedance: 50 Ω nominal
• Input connector: 3.5 mm male (APC 3.5, SMA compatible)
• Output connector: BNC female

Power Handling
• Maximum continuous input: 200 mW
• Typical short-term maximum ( 0.5 mV/µW to 18 GHz; > 0.18 mV/µW to 26.5 GHz
• Output noise: < 50 µV
• Square-law region: Typically within 0.5 dB of theoretical from tangential signal sensitivity to 18 dBm (Option 002 extends to ~8 dBm)
• Output polarity: Negative (Option 003 selects positive)

Standing Wave Ratio
• 1.2 to 4 GHz
• 1.5 to 18 GHz
• 2.2 to 26.5 GHz

– Key Features

• Wideband operation from 10 MHz through 26.5 GHz with calibrated frequency response
• Low-barrier Schottky technology for enhanced sensitivity at reduced power levels
• Extended square-law dynamic range (Option 002) for improved linearity
• Matched detector pair option (Option 001) for superior tracking across frequency
• Operating range from –20°C to +85°C; rated to 4,570 m altitude
• Rugged construction: 20 G vibration (80–2,000 Hz), 100 G shock (11 ms)

– Typical Applications

Power leveling and control loops; RF/microwave signal detection; broadband frequency response measurement; radar and communication system characterization.