Axial ratio and circular polarization

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MuroSamuro

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Hello,
Does axial ratio is sufficient to determine on whether an antenna is circulary polarized?
If you consider two orthogonal E field (say x and y with the same amplitude) componnents without 90 degress phase shift, the axial ratio would still be 1. If so, why does people state that axial ratio determines circular polarization by itself?

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No, the axial ratio alone is not enough to decide whether an antenna is circularly polarized. Circular polarization is determined by interaction of parameters including axial ratio, phase relationship between the electric and magnetic fields, and the sense of rotation of the polarization.
Anyway, in reality there is no perfect linear or perfect circular polarized antennas. All antennas are more or less elliptical polarized.
 
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