VNA measurements of an antenna return Z, RL, Xs, Rs... and also phase. I usually check Z=50 and Xs=0 to reach the max Return Loss and the lowest SWR 1.0:1, without having care of phase values.
However I noticed that in some cases even if Z and Xs are 50 snd 0 the SWR is high (even 6:1... 10:1) becouse of a particular high value of phase.
What's the best value of phase I have to reach for a perfect matching?
Do I need to have always care of the phase like Z and Xs?