Agilent/Keysight 11678A

The Agilent/Keysight 11678A is a low-pass filter kit designed to attenuate harmonics generated by RF sources, enabling precision measurements in demanding test environments. This five-filter ensemble provides tailored harmonic suppression across a broad frequency spectrum, from 2.8 GHz to 13.0 GHz, making it suitable for RF component characterization, signal analysis, and calibration work where harmonic distortion degrades measurement accuracy.

– Technical Specifications

• Filter Elements: Five individual low-pass filters
– Agilent 11688A: 2.8 GHz cutoff frequency
– Agilent 11689A: 4.4 GHz cutoff frequency
– Agilent 11684A: 6.8 GHz cutoff frequency
– Agilent 11685A: 9.5 GHz cutoff frequency
– Agilent 11686A: 13.0 GHz cutoff frequency
• Insertion Loss: Less than 1.1 dB at 0.95 fc
• Harmonic Rejection: Greater than 40 dB at 1.25 fc
• Characteristic Impedance: 50 ohms nominal
• Connector Type: Type-N female and male
• Net Weight: 0.44 kg (1 lb)
• Shipping Weight: 1.2 kg (2.9 lb)

– Key Features

Multiple cutoff frequencies eliminate the need for filter swapping between measurement setups. Consistent 50-ohm impedance ensures minimal reflections across all elements. Low insertion loss preserves signal integrity while delivering strong harmonic suppression beyond the cutoff frequency. Type-N connectors provide reliable connections in RF test benches.

– Typical Applications

RF and microwave component testing where harmonic suppression is critical. Signal analysis requiring attenuation of unwanted frequency content. Calibration procedures sensitive to out-of-band distortion. Measurement setups where source harmonics would otherwise mask desired signals or introduce systematic error.

– Compatibility & Integration

Designed as a modular accessory kit for RF test systems. Each filter operates independently, allowing selection based on the measurement band of interest.