How to Minimize Cable Loss in Large RF Measurement Setups

+ USB Vector Network Analyzer

Distributed Measurements

Measuring large radio frequency (RF) assemblies often requires long test cables between the vector network analyzer and the device under test, introducing additional insertion loss, reduced dynamic range, and increased measurement uncertainty. Distributed vector network analysis minimizes these effects by separating the measurement hardware and positioning each measurement port close to the device under test. Two Streamline USB Vector Network Analyzers can be separated by up to five meters while maintaining synchronized operation, allowing engineers to perform accurate scattering parameter measurements on large antennas, satellite payloads, radar systems, cable assemblies, and other physically distributed structures.

Locating the measurement ports close to the device under test reduces the impact of cable loss while simplifying measurements that would otherwise require long phase-stable test cables. Engineers can characterize remote devices, large mechanical assemblies, and installed equipment while maintaining measurement accuracy across the operating frequency range. This architecture supports flexible test configurations, improves measurement repeatability, and simplifies validation workflows for applications where conventional benchtop vector network analyzer configurations are impractical.

Distributed VNA Solution

Accurate measurements of large radio frequency assemblies require minimizing the electrical effects introduced by long test cables while maintaining phase coherence between measurement ports. The workflow begins by synchronizing two Streamline USB Vector Network Analyzers configured for distributed operation, followed by broadband calibration and scattering parameter measurements with the measurement hardware positioned near the device under test. Distributed Vector Network Analyzer software coordinates the measurement system, manages synchronization, and enables broadband measurements while preserving dynamic range that would otherwise be reduced by excessive cable attenuation. The solution supports characterization of large antennas, long cable assemblies, radar systems, installed equipment, and remote radio frequency devices without requiring extended phase-stable test cables. Engineers can improve measurement repeatability, simplify complex test setups, and perform accurate broadband characterization in environments where traditional vector network analyzer configurations are difficult to deploy.

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How to Minimize Cable Loss in Large RF Measurement Setups

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