I am carrying out an on-wafer TRL calibration using standards we made ourselves. We have a non zero length Through, a Line standard that is a nominal 0.25 wavelength longer than the Through at midband and an Open. When defining calibration coefficients I have specified a zero length Through to place the reference plane at the midpoint of the Through which is where our DUT is located. All of our standards and the DUT use via-less CPW to Microstrip transitions. I am using an E8364B PNA for the measurements.

What I would like to access is the complex propagation constant. As far as I am aware this is calculated as part of the TRL algorithm. Can you tell me whether it is possible to display or download the propagation constant from an internal register of the PNA ? If this isn't possible with the PNA I have access to an 8510C as well. Many thanks,

John

What I would like to access is the complex propagation constant. As far as I am aware this is calculated as part of the TRL algorithm. Can you tell me whether it is possible to display or download the propagation constant from an internal register of the PNA ? If this isn't possible with the PNA I have access to an 8510C as well. Many thanks,

John

The propagation constant is currently not available from internal registers. Remeasuring the line standard will allow you to compute it. If you measure the line standard last you can minimize connection repeatability problems. You indicated you were doing TRL and setting the reference plane to the middle of the thru. If you measure the difference in the lengths between the thru and the line standards you can compute the associated propagation constant.