The Keysight N5281A is a four-channel frequency down converter module that extends Vector Network Analyzer capability to 50 GHz by translating high-frequency RF signals to lower intermediate frequencies for standard VNA processing. Operating across 10 MHz to 50 GHz, the N5281A delivers precise frequency translation with IF output spanning 0.007 to 30.0 MHz, making it essential for aerospace, defense, and advanced communications applications requiring wideband performance and accurate millimeter-wave characterization.
Technical Specifications
• RF Frequency Range: 10 MHz to 50 GHz
• IF Port Frequency Range: 0.007 to 30.0 MHz
• Number of Channels: Four
• RF Input Power Handling: +18 dBm maximum (RF Port), +5 dBm maximum (LO Port)
• Optimum LO Power: 0 dBm ±1 dB
• RF Input @ 0.1 dB Compression: −10 dBm (10 MHz to 50 GHz)
• IF Output Level: 5 dB to −10 dB (10 MHz to 26.5 GHz); −10 dB to −20 dB (26.5 GHz to 50 GHz)
• Harmonic Mode: 3rd harmonic
– Key Features
• Simultaneous four-channel signal processing for multi-port measurements
• Converts RF signals across the full 10 MHz to 50 GHz band to processable IF frequencies
• Accommodates third harmonic mode operation for extended measurement flexibility
• Supports both laboratory and field deployment scenarios
– Typical Applications
• Aerospace and defense RF/microwave component characterization
• Wideband communications system testing and validation
• Millimeter-wave network analysis and device characterization
• Frequency extension of existing VNA platforms to 50 GHz capability
– Compatibility & Integration
Compatible Network Analyzers:
• Keysight E8363B/C (10 MHz to 40 GHz)
• Keysight E8364B/C (10 MHz to 50 GHz)
• Keysight N5244A/B (10 MHz to 40 GHz)
• Keysight N5245A/B (10 MHz to 50 GHz)
Compatible Measurement Receivers:
• Keysight N5264A PNA-X Measurement Receiver
• Keysight N5242A 2-Port or 4-Port PNA-X Network Analyzer
