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I am building an SMP series interface SOLT cal kit. Need guidance on how to extract L0,L1,L2,L3 and C0,C1,C2,C3 coefficients.

Question asked by EricBrand on Mar 9, 2018
Latest reply on Jun 11, 2018 by EricBrand

We have successfully built LRL/TRL calibration kits for SMPM interface per MIL-STD-348 (.069”/1.75mm airline) .  This kit consists of the following: short, thru, and a 3 different lengths of airlines.   With this LRL kit, we were able to get good results up to 67 GHz when we assumed zero for the  L0, L1, L2, L3  coefficients for the short on the Agilent 8361C VNA.   However, we are now attempting to build a SOLT calibration kit for SMP interface per MIL-STD-348.   It appears that assuming zero for the L and C coefficients will not be sufficient for a good SOLT short open load thru calibration, so we are trying to figure out what the proper method of deriving/calculating L and C coefficients would be.   We have looked at several papers addressing calibration methods, but each one seems to do some “hand-waving” and leave out essential details on the method of deriving L and C coefficients for the open and short.     Is there any document that clearly lays out the steps necessary to derive L and C coefficients that are sufficiently accurate to work for an SOL 1-port calibration?  Any guidance/direction would be highly appreciated.

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