Agilent/Keysight 44476A

The Keysight 44476A is a microwave switch module containing three independent Single Pole Double Throw (SPDT) 50 Ω coaxial relays for high-performance signal routing in test and measurement systems. Operating from DC to 18 GHz, the module delivers low insertion loss and high isolation, making it suitable for multi-band receiver and transmitter testing applications requiring reliable relay switching.

– Technical Specifications

• Frequency Range: DC to 18 GHz
• Configuration: Triple 1-to-2 multiplexers (three 33311B coaxial switches)
• Relay Type: SPDT coaxial relays
• Impedance: 50 Ω
• Isolation: >90 dB to 26 GHz
• Insertion Loss: <0.25 dB (DC to 2 GHz); <0.50 dB (DC to 18 GHz)
• VSWR: <1.15 dB (DC to 2 GHz); <1.25 dB (DC to 12.4 GHz); <1.40 dB (DC to 18.0 GHz)
• Input Power Rating: 1 W average, 100 W peak
• Input Voltage: ±7 VDC maximum
• Repeatability: 0.03 dB after 10⁶ operations
• RF Connectors: 3-mm SMA (module edge)
• Weight: Approximately 2 lbs

– Key Features

• Three independent SPDT relay channels for simultaneous multi-path switching
• Exceptional high-frequency performance to 18 GHz with controlled VSWR characteristics
• Excellent relay repeatability supports long-term measurement confidence in production and laboratory environments
• All-coaxial relay architecture eliminates cross-talk between switching paths

– Typical Applications

• Multi-band RF receiver and transmitter test systems
• Signal source multiplexing and routing
• Electronic test and measurement requiring frequency-agile switching

– Compatibility & Integration

Designed for integration into Keysight 3499 series mainframes (3499A, 3499B, 3499C). Module includes one connection terminal and certificate of verification.