asking for axial ratio and co-polarization

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anwertamimi

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can any one tell me what is meaning of the following terms used in the antenna:
1- axial ratio.
2- co-polarization.
 

I dont really know what co-polarization is but i think axial ratio is the ratio of the Φ and θ components of the field. But you have to choose either EΦ/Eθ ≥1 or Eθ/EΦ≥1. I mean you have to take the ratio that is greater than 1.
 

axial ratio is a parameter to describe the circular polarization performance of an antenna. For more information, you can refer some classical antenna book, such as Balanis's Antenna Theory: Analysis and Design.
 

Does anyone have the formula linking the Axial Ratio and the Input Ports' Amplitude Unbalancement?

Thanks in advance.

Lupin
 

A linear polarization is specified by its spatial orientation(co-polarization) and by its cross-polarization.
+Co-polarizartion is desired signal
+Cross-polarizarion is undesired signal.

Circular polarization is specified by its sense and by its axial ratio.
A peak-peak value is the axial ratio and represents the polarization quality for a circular polarized antenna.
 

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