Patch antenna radiation pattern

Dear all,

1. Is there an ideal pattern for the radiation pattern of a patch antenna?

2. If yes, is it necessary to plot it at 90 degree or 0 degree?

3. If not necessary, how do we plot it in CST?

4. Is it necessary to view the radiation pattern of a circularly polarized antenna using Ludwig 3 coordinate system and why ?

Any help is appreciated.

Thanks in advance :)