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Coupler measurement

Question asked by rf_engineer_5 on Apr 22, 2014
If one is trying to measure a directional coupler's FWD port coupling value in order to get the most accurate number possible (lets leave out specific VNA model's accuracy for now) what are some suggestions for setting up the VNA? I am referring to things like the IFBW, sweep speed, port power, etc.  Also, would a THRU cal be as good as a 2port cal since this is only a loss measurement of the FWD port?  This would just speed up a measurement w/o having to go through a SOLT setup.