The Weinschel AF9004 is a broadband miniature step attenuator engineered for precision signal level control in 50-ohm RF and microwave systems up to 18.0 GHz. This in-line, bidirectional attenuator delivers 0 to 99 dB of attenuation in 1 dB increments with exceptional repeatability and durability, making it ideal for signal sources, receivers, field strength meters, and spectrum analyzers.
Technical Specifications
Attenuation Range: 0 to 99 dB in 1 dB steps
Frequency Response: DC to 18.0 GHz
Nominal Impedance: 50 Ω
Maximum VSWR: 1.75 (DC to 18 GHz)
Power Handling:
• Average: 2 watts at 25°C ambient, derated to 1 watt at 54°C
• Peak: 200 watts (5 µsec pulse, 0.5% duty cycle)
• Power coefficient: < 0.005 dB/dB/watt
Stability:
• Temperature coefficient: < 0.0004 dB/dB/°C
• Repeatability: Better than 0.05 dB across frequency band
• Switch life: Over 1,000,000 steps
Phase Shift: Approximately 0.5° per dB per GHz
Insertion Loss: 1 dB maximum
Attenuation Accuracy: ±2.5 dB at 99 dB setting at 18 GHz
Operating Temperature Range: 0°C to +54°C
– Key Features
• Passivated stainless steel SMA connectors (standard or right-angle, male or female options)
• In-line, bidirectional configuration for flexible system integration
• Mechanical safety stop prevents large output power transients from damaging sensitive downstream equipment
• Clockwise shaft rotation increases attenuation
• Environmental design meets MIL-A-24215 requirements (vibration, shock, humidity to 95%, altitude)
– Typical Applications
• Signal source level control and optimization
• Receiver gain calibration and dynamic range testing
• Field strength measurement systems
• Spectrum analyzer input protection and signal conditioning
• High-reliability 50-ohm systems requiring precise attenuation
• Space-constrained applications requiring miniature form factors
– Compatibility & Integration
The AF9004 integrates into standard 50-ohm RF and microwave systems via SMA connectors with connector orientation options for diverse installation requirements.
