The Keysight 11867A is a passive RF limiter that protects sensitive input circuitry in test equipment from high-power transients and accidental overloads. This solid-state device reflects incident power exceeding its limiting threshold, safeguarding spectrum analyzers, counters, amplifiers, and other instruments across a wide frequency range.
Technical Specifications
• Frequency Range: 10 Hz to 1800 MHz
• Impedance: 50 ohms nominal
• Limiting Threshold: 1 mW (0 dBm) typical
• Maximum Input Power:
– Continuous average: 10 watts (+40 dBm)
– Peak power (≤1 µsec pulse, 0.001 duty cycle): 100 watts
• Insertion Loss: Less than 0.75 dB (less than 1.0 dB specification also applies)
• Insertion Loss Flatness: Less than ±0.25 dB
• Reflection Coefficient: Less than 0.1 (1.2 SWR); less than 0.13 (1.3 SWR)
• Excess Noise Temperature: Less than 20 Kelvin
• Construction: Four oxide-passivated silicon diodes (two PIN, two Schottky-barrier) integrated in a 50 ohm transmission line with low-pass filter configuration; cutoff frequency approximately 2.5 GHz
• Operating Temperature: 0 °C to 55 °C
• Humidity: Less than 95% RH
– Key Features
• Unidirectional operation; input and output connectors are not interchangeable
• Type N female input, Type N male output
• No field adjustments; diodes are non-replaceable
• Failure mode typically open circuit or short to ground, protecting connected instruments
• Compact form factor: 21 mm × 60 mm; 90 grams
– Typical Applications
• Input protection in RF and microwave test systems
• Transient and overload suppression in measurement setups
• General-purpose RF power limiting in communications and industrial RF applications
– Compatibility & Integration
Designed for integration with Keysight Microwave & RF Test Systems and compatible with spectrum analyzers, counters, and amplifier instruments requiring input stage protection.
