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first, The NA's source reflection error can be removed by calibration, But because of the amplitude phase response nonlinearity from the directional coupler, the calibration cannot remove the reflection err clear. so it will cause the bad curls.
but it just not look well, The uncertainty of...
soldering a cable to VNA is a good way to measurement. the cable caused lose can be delete by calibration or input the cable parameter in VNA. if the pad is one element of your network, you can connect full network to you VNA and use the TDR function to locate the reflected element.
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