It looks like the actual reflection coefficient of short, can I know the detailed calculation process?
Depending on when the kit was introduced, there were several methods to determine the values for the models of opens and shorts on the kits. One method used finite-element analysis of the physical dimensions of the standard, ranging from maximum to minimum (for example using the minimum spec of the center conductor and the maximum spec of the outer conductor and the longest length of the physical short, based on manufacturing tolerances, to find the maximum phase shift). The mean values are used to compute the reflection coefficient and the max and min to compute the uncertainty of the cal-standard model. Loss is computed from skin effect, and at one time was verified using airlines to determine loss per unit length for the connector type. For some kits we even measured all the individual elements (center conductor, outer conductor, pin contact size) and sent it to METAS for them to use in their detailed modeling of the standard. So, in short...it's complicated.
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