calculating vissually axial ratio frm radiation pattern

[yefj]

Hello,In anechoic chamber we are testing the antenna using a test antenna,in our case if we design circular patch antenna then we test it with circular antenna.In cst i think this option is as shown bellow.It gives me some radiation pattern as shown bellow.
I dont want to use the axial ratio option in CST,I want to calculate the axial ratio from the radiation pattern.
Axial ratio by definition is the ratio between electric field components.
How do i see the axial ratio from the radiation pattern shown bellow?
Thanks.

 

[volker@muehlhaus]

I want to calculate the axial ratio from the radiation pattern.

Your plot shows "Abs" which is combined value from all field components. This means your plot shows no individual field components and you cannot calculate axial ratio from this plot.

 

[yefj]

Hello Volker,i need relative amplitudes and the relative phases of the two orthogonal linear polarizations.
how can i do it in CST?
Thanks.

 

[volker@muehlhaus]

I'm not a CST user, so I cannot provide details. You need to look at Theta and Phi components separately, instead of using Abs.

 

[vfone]

Right click on Axial Ratio, Far Field Plot Properties, Plot Type: 1D Polar, Plot Range: -180..+180 degree, and you get the phase and the amplitude of the Axial Ratio at specific angle.