Improving High Frequency S-Parameter Measurements by Moving the VNA Port to the DUT

Most standard vector network analyzers (VNAs) are instruments with ports mounted in a single chassis. This paradigm is used to keep the source and measurement circuitry close together to simplify designs and enable the very strict synchronization needed for high-frequency vector S-parameter measurements. For most benchtop applications, having ports tied to a single chassis is not a significant issue since short high-quality coax cabling can be used to interface between the ports and the device under test (DUT) with minimal effect on the quality of the S-parameter measurement.

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