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delay for TRL calibration using PNA 8363 for microstrip

Question asked by daneleceng on Mar 22, 2007
Latest reply on Jun 6, 2008 by daveb

I was wondering if someone has any info on calculating the offset delay time for the reference plane of a TRL cal kit I am trying to create. My question deals with that of dispersion. Microstrip is dispersive by nature and I don't know what value of phase velocity for any particular frequency, since the equation for offset delay is:
Offset delay = physical_length/Phase_Velocity, where Phase_Velocity=Speed_of_Light/Square_Root_of_Dielectric_Constant

Does this make sense?

Anyone can help?