HP / Agilent 8493B Coaxial Fixed Attenuator, DC to 18 GHz

The HP/Agilent 8493B is a coaxial fixed attenuator that delivers precision signal attenuation from DC to 18 GHz. Available in five attenuation values—3 dB, 6 dB, 10 dB, 20 dB, and 30 dB—it maintains calibrated accuracy across the full frequency spectrum, making it essential for RF and microwave measurement systems requiring controlled signal levels and minimal reflections.

– Technical Specifications

• Frequency Range: DC to 18 GHz
• Attenuation Values: 3 dB, 6 dB, 10 dB, 20 dB, 30 dB
• Characteristic Impedance: 50 ohms
• Maximum SWR: 1.2 (DC to 8 GHz); 1.3 (8 to 12.4 GHz); 1.5 (12.4 to 18 GHz)
• Attenuation Accuracy:
– 3 dB: ±0.3 dB across DC to 18 GHz
– 6 dB: ±0.3 dB (DC to 12.4 GHz), ±0.4 dB (12.4 to 18 GHz)
– 10 dB: ±0.6 dB across DC to 18 GHz
– 20 dB: ±0.6 dB (DC to 12.4 GHz), ±1.0 dB (12.4 to 18 GHz)
– 30 dB: ±1.0 dB across DC to 18 GHz
• Maximum Input Power: 2 W average; 100 W peak
• Operating Temperature: −55 °C to +125 °C
• Connectors: SMA male / SMA female
• Dimensions: 27.94 mm × 12.7 mm × 12.7 mm
• Weight: 9 g

– Key Features

• Thin-film attenuator construction delivers stable, repeatable attenuation performance
• Low SWR across all frequency bands minimizes reflections and measurement errors
• Compact form factor (27.94 mm length) integrates easily into test setups and signal chains
• Rated for 100 W peak input, supporting high-power pulse measurements
• Temperature-stable performance across industrial and laboratory operating ranges
• SMA connectors provide universal compatibility with standard RF test equipment

– Typical Applications

• RF and microwave test and measurement systems
• Signal level conditioning in receiver front-ends
• Impedance matching and attenuation in laboratory benches
• Field service and calibration applications

– Compatibility & Integration

The 8493B interfaces with any RF system employing SMA connectors and requiring 50-ohm impedance. The compact dimensions and light weight (9 g) allow insertion into confined test configurations without mechanical rework.