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TRL calibration for tapered CPW

Question asked by mil on Jun 22, 2010
Latest reply on Aug 17, 2010 by Dr_joel
Hello all,

I need to perform a TRL calibration on a Coplanar Waveguide. The CPW is tapered to increase the impedance. The gap (see figure) is where the DUT will be put.
My question is regarding the characteristic impedance that we need to provide at the time of the TRL calibration. Since the test fixture (CPW + tapered CPW) is non uniform and thus have a varying Zc, how do I find or define the characteristic impedance of each port?

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A second issue that is boggling me is concerning the definition of the characteristic impedance. My design is leading to 3 different values for the impedances (Zpv Zvi and Zpv). My concern is which of these definitions is the most appropriate to use with the VNA measurements ?


Thanks in advance!
mil  

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