Keysight (Agilent) 8470B Low-Barrier Schottky Diode Detector

The Keysight (Agilent) 8470B is a low-barrier Schottky diode detector engineered for precise RF and microwave signal detection across 10 MHz to 18 GHz. This high-sensitivity detector delivers exceptional broadband flatness and low SWR performance, making it ideal for power monitoring and signal detection in demanding measurement applications. The LBSD design provides superior frequency response characteristics compared to point-contact alternatives, with integrated burnout protection and field-replaceable diode elements for economical maintenance.

Technical Specifications

• Frequency range: 10 MHz to 18 GHz


• Input impedance: 50 Ω (nominal)


• Output impedance: 1 to 2 kΩ (typically 1.3 kΩ) shunted by 35 to 65 pF (typically 50 pF) Frequency Response


• Flatness: ±0.3 dB to 12.4 GHz, ±0.5 dB to 15 GHz, ±0.6 dB to 18 GHz


• Option 001 (matched pair): ±0.2 dB from 10 MHz to 12.4 GHz, ±0.3 dB from 12.4 GHz to 18 GHz at −30 dBm Voltage Standing Wave Ratio


• Maximum SWR: 1.15 (1 to 4 GHz), 1.3 (4 to 15 GHz), 1.7 (15 to 18 GHz) at 2 dBm Sensitivity & Power


• Low-level sensitivity: > 0.5 mV/µW (typical > 0.5 mVdc/µW CW)


• High-level sensitivity: < 0.35 mW produces 100 mV output


• Maximum operating input power: 200 mW (peak or average)


• Short-term peak power: 1 W for less than 1 minute


• Noise: < 50 µV Square-Law Region


• Standard: ±0.5 dB square-law from TSS level to 18 dBm


• Option 002 (video load): Extends to ≥ 0.1 mW (−10 dBm) or approximately 8 dBm

Key Features

• No DC bias required - direct oscilloscope integration


• Output polarity: Negative standard; Option 003 provides positive


• Operating temperature: −20 °C to +85 °C


• Humidity: < 95% relative humidity


• Weight: Approximately 114 g

Compatibility & Integration Connectors

• Input: APC-7 (standard); Option 012 provides Type-N


• Output: BNC female Options


• Option 001: Matched detector pair


• Option 002: Video load for extended square-law region


• Option 003: Positive output polarity


• Option 012: Type-N input connector