I am trying to plot these values, if for example E field I would need to plot Ex Ey as phase and magnitude across the band (or at a specific frequency point?) at boresight direction to check for Circular polarization in a crossed dipole antenna and observe the values, 90 degrees for phase and +_3 for amplitude

how do I do that in CST? I believe that I should plot data from CST then use Matlab code to calculate the difference/ratio, but I just can't find anything relevant to choosing X,Y field components in the post processing window

I'm using the 2019 version of the CST software