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Help with waveguide-coaxial measurement

Question asked by leob001 on Dec 30, 2014
Latest reply on Dec 31, 2014 by Dr_joel
I'm trying to characterize a waveguide directional coupler with a coaxial coupled port using an N5224A with a R11664A cal kit.  I chose the Smartcal, performed a 2 port cal, and measured S21 and S11 on the thru leg of the coupler.  But I'm stuck as to how to measure the coupled port. How do I calibrate the PNA for a mixed waveguide-coaxial measurement?  Any guidance would be appreciated. Thanks.