Rohde & Schwarz ZNB4 4.5GHz Vector Network Analyzer

The Rohde & Schwarz ZNB4 is a vector network analyzer operating from 9 kHz to 4.5 GHz, purpose-built for RF component characterization across development, production, and service environments. Available in 2-port and 4-port configurations - with the 4-port model featuring two independent generators - the ZNB4 delivers dynamic range up to 140 dB and trace noise below 0.004 dB RMS. Measurement speed reaches 4 ms for 401-point sweeps, with per-point acquisition as fast as 2.5 μs in CW mode.

Output power spans –55 dBm to +13 dBm across the frequency range (–85 dBm to +13 dBm with extended power option). A 12.1" high-resolution touchscreen provides intuitive control, while a modular architecture supports expansion to 48 ports via switch matrices.

Technical Specifications

• Frequency Range: 9 kHz to 4.5 GHz


• Test Ports: 2 or 4 (4-port model includes dual independent generators); expandable to 48 ports


• Dynamic Range: Up to 140 dB (10 Hz IF bandwidth); 138 dB typical (100 kHz–50 MHz and ≥4 GHz); 140 dB typical (50 MHz–4 GHz)


• Trace Noise: <0.004 dB RMS at 10 kHz IF bandwidth


• Output Power: Up to +13 dBm; –55 dBm to +10 dBm (9 kHz–100 MHz), –55 dBm to +13 dBm (100 MHz–2.5 GHz), –55 dBm to +10 dBm (≥2.5 GHz); optionally –85 dBm to +10/+13 dBm with R&S®ZNB-B22 extended power range


• IF Bandwidth: 1 Hz to 10 MHz


• Sweep Time: 4 ms (401 points); 90 dB dynamic range


• Input noise floor <–115 dBm (9 kHz–50 kHz), <–120 dBm (50 kHz–50 MHz), <–130 dBm (50 MHz–4 GHz), <–125 dBm (≥4 GHz)


• Microsecond-class measurement resolution in CW mode

Typical Applications

• Amplifier, mixer, filter, and connector characterization


• Cable and transmission line measurements


• Production and in-service RF component testing

Compatibility & Integration

• GPIB, LAN, and USB interfaces for remote control and device integration