circular polarization and radiation patterns

[aniakhan]

hi,
if anyone have worked on circular polarized antenna then plz guide me that is it possible that H plane radiation patterns tilts as antenna is displaced a little bit from centre? i have cp antenna and when i move it half wave length distant from centre where it was previously placed its H plane tilts a little bi and all others parameters such as gain,s parameters remain same.is it due to cp beahvior?but how??

 

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