The Narda 4226-20 is a broadband coaxial directional coupler engineered for precision RF measurements and signal monitoring across microwave frequencies. Operating from 500 MHz to 18 GHz, it delivers a nominal 20 dB coupling with ±1 dB variation and maintains consistent performance across its entire bandwidth with ±1.1 dB frequency sensitivity. The device handles 20 W average input power and peaks at 3 kW, making it suitable for both laboratory and field applications demanding high reliability.
This coupler achieves 15 dB directivity from 0.5 to 12.4 GHz and 12 dB from 12.4 to 18 GHz, ensuring clean signal isolation between primary and coupled outputs. Insertion loss is specified at 0.9 dB on the primary line, while both primary and secondary lines maintain a 1.50:1 VSWR. The compact 110 g module integrates directly into RF systems via SMA connectors and carries commercial and military-grade certification with MSL 1 rating for unlimited moisture sensitivity.
Technical Specifications
• Frequency Range: 500 MHz to 18 GHz
• Nominal Coupling: 20 dB (±1 dB variation, ±1.0 dB maximum deviation)
• Frequency Sensitivity: ±1.1 dB
• Directivity: 15 dB (0.5–12.4 GHz); 12 dB (12.4–18 GHz)
• Insertion Loss: 0.9 dB
• VSWR (Primary Line): 1.50:1
• VSWR (Secondary Line): 1.50:1
• Average Power Handling: 20 W (at 1.2:1 source and load VSWR)
• Peak Power Handling: 3 kW
• Weight: 110 g
– Key Features
• Wide frequency coverage spanning L-band through upper Ku-band
• Tight coupling tolerance for repeatable measurements
• High directivity across dual frequency bands
• Low insertion loss minimizes signal degradation
• High peak power capability for pulsed RF systems
• Commercial and military-grade construction
– Typical Applications
• RF power monitoring and signal sampling
• Test and measurement systems
• Antenna array feed networks
• Amplifier output coupling
– Compatibility & Integration
SMA connectors facilitate integration into standard coaxial RF assemblies. The module form factor and 110 g weight support compact system designs without requiring external mounting hardware.
