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Circular polarization using coupler

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gayathrim

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hello,
i'm designing a patch antenna in hfss. in order to achieve circular polarization i'm planning to use a 90 degree hybrid coupler. Is it possible to create a 90 degree phase shift in orthogonal mode excitation in hfss without actually having to draw a coupler. thanks in advance.
 

Hi gayathrim,

Yes, it is possible. Using either lumped ports or wave ports, you can set the sources excitation phase under "HFSS"->"Fields"->"Edit Sources...".

Good luck!
 

you can set the sources excitation phase under "HFSS"->"Fields"->"Edit Sources...".
I tried that. I used two lump ports positioned 90 degrees apart and sources changed to phase 0 and 90 respectively. however, i'm still not able to achieve an axial ratio vs frequency below 3 dB for resonating frequencies.
 

Also, since there are two ports, which return loss should we consider? s11 or s22? or the resultant?
 

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