Calibration Techniques Help Ensure Accurate VNA Measurements

By Bob Buxton, Anritsu Company

In my last column, we discussed vector network analyzer (VNA) fundamentals. Today, we will focus on a critical element in making accurate S]parameter measurements with a VNA calibration.

Those unfamiliar with VNAs may interpret calibration as an instrument calibration performed at regular intervals. However, with VNAs it is necessary to perform a measurement calibration as part of the setup to measure the device under test (DUT). While the VNA is a highly linear receiver that has sufficient spectral purity in its sources to make accurate measurements, imperfections exist that limit measurements done without calibrations.