The Keysight 8491A coaxial fixed attenuator provides precise attenuation, flat frequency response, and low SWR over broad frequency ranges. The attenuator has type-N connectors and is available in nominal attenuations of 3 dB and 6 dB, as well as 10 dB increments from 10 dB to 60 dB. This swept-frequency tested attenuator ensures specification compliance at all frequencies. A nameplate chart attached to each unit lists calibration points.

Superior RF Performance

  • Frequency Range: DC to 12.4 GHz
  • Maximum SWR: 1.2 to 4 GHz, 1.3 to 12.4 GHz

Power Handling

  • Maximum Input Power: 2 W (average), 100 W (peak)


  • Connector: Type-N male, female
8491A Coaxial Fixed Attenuator

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