How to plot co- and cross polar radiation pattern at E and H planes in CST ?

You can make both plots with the template based postprocessing. First of all you have to set farfield monitors at the wanted frequencys. You find it unter "Solve" --> "Filed Monitors". Then Choose "Results" --> "template based postprocessing". There you have to choose Farfield results. In the upcoming window you can selevt whatever you need.

thanks for ur effort , could u also tell me how on HFSS

I'm sorry I never worked with HFSS

Hello in hfss(ver 10)
results create reports {█(far field@radiation pattern)┤
then click ok
you first chose soulution (create reports)---(far field-radiation patterns) then click ok, you first choose solution (sweep for all frequency) then
in sweeps tab chose a frequency (one frequency) chose phi=0 or 90 and your primary sweep must be theta
in mag tab choose rE (category tab) and in quantity select rEphi and rEtheta( dB)
if don’t solve your problem up your file

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