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.

sorry for the delay, been travelling...

10. Change Z0 setting from 50 to 500 ohms then extract data (same data fields as above with gated smith and gated phase).NOPE: leave it 50 ohms and measure the load, and look on the smith chart to determine impedance (should be 50 ohms, and the inductance, using markers (look at figure 9.7, lower right smith chart). take the average value of the inductance and compute the effective line delay using equation 9.4, then modifiy the load standard in the cal kit to have 500 ohms Z and the delay computed.

set your open or short up on the smith chart and use markers to pick of 3 values of capacitance across your band of interest.

Use just the values of open to get the factors for the open capacitance polynomial as in figure 9.11

Use just the values of the short to get the factors for the short inductance (or just call them zero)