The NEC 55957A and 77-2 N05 is a waveguide circulator engineered for microwave signal routing in radar and communication systems. This component provides one-way signal transmission while isolating opposing signals, delivering directional control essential for duplex operation and system protection. The unit combines low insertion loss with high reverse isolation in a compact waveguide package.
Technical Specifications
Isolation: Minimum 20 dB in reverse direction
Insertion Loss: Typically 0.1 to 0.5 dB, with maximum values between 0.30 dB and 0.80 dB depending on frequency band and model variant
VSWR: Maximum 1.15 to 1.30 for standard configurations
Connector Type: Type N connector (77-2 N05 designation); standard waveguide flanges such as UG series
Operating Temperature: -40°C to +85°C standard range; select models rated to +125°C
Power Handling: Waveguide circulators of this class support variable power levels ranging from hundreds of watts average power to kilowatt-level peak power, with capability determined by design, thermal management approach, and pressurization status
– Key Features
• One-way signal transmission with directional isolation
• Low insertion loss across operating band
• High reverse isolation for signal protection
• Waveguide interface with standard flange compatibility
• Compact form factor for system integration
• Temperature-stable operation across extended ranges
– Typical Applications
• Radar systems (transmit/receive isolation)
• Cellular and wireless communication networks
• Military and aerospace RF subsystems
• Microwave test instrumentation
• Duplex communication circuits requiring signal routing and isolation
– Compatibility & Integration
The 55957A integrates into systems requiring waveguide-based signal management. Type N connector designation (77-2 N05) and standard UG flange compatibility enable straightforward integration into existing microwave assemblies and test configurations.
