Agilent/Keysight 44478A

The Agilent/Keysight 44478A is a dual 1×4 RF multiplexer module that delivers bi-directional switching for signals spanning DC to 1.3 GHz. Engineered for RF test systems, communication equipment, and automated test setups, this plug-in module routes high-frequency and fast pulse signals with exceptional isolation and minimal insertion loss.

– Technical Specifications

• Frequency Range: DC to 1.3 GHz
• Impedance: 50 Ω
• Channel Configuration: Dual 1-to-4 multiplexers (seven relays per multiplexer in “tree” structure)
• Channel Isolation: >55 dB at 1 GHz
• Insertion Loss: 55 dB at 1 GHz enables accurate dynamic-range measurements and cross-talk suppression.
• “Tree” Relay Structure: Reduces VSWR and enhances channel isolation through optimized signal path topology.
• Flexible Routing: Dual 1×4 configuration allows independent switching between four inputs and two outputs.
• Termination Support: Off-channel 50 Ω SMB resistive termination maintains proper circuit operation and signal integrity.

– Typical Applications

• Automated RF test benches and system integration
• Multi-channel signal routing in communication test setups
• High-frequency pulse signal multiplexing
• Dynamic impedance matching in measurement systems

– Compatibility & Integration

The 44478A is a plug-in module designed for Agilent/Keysight mainframe systems. Compatible platforms include the Agilent 3499A/B/C series and other compatible Agilent/Keysight switching mainframes accepting similar form-factor modules. Complete documentation including user manuals, reference guides, service manuals, and quick reference guides are available.