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Time Domain Substitution Vs. Port Extension Vs. Frequency Gated By Time
By Don Metzger, CTO, Constant Wave
A common measurement problem involving Vector Network Analyzers (VNA) involves projecting the measurement accuracy from a reference plane, established through calibration, to another location. Moving the reference plane may be necessary because it may not be convenient, or even possible, to perform a calibration at the desired location. This might result from a lack of appropriate calibration standards or, perhaps, from a lack of suitability of the desired location for the insertion of multiple calibration standards. Two common solutions to this problem are Port Extension and Frequency Gated by Time.
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