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    difference between co-pole and cross pole in antenna pattern

    hi
    what is difference between co-pole and cross pole in antenna pattern?
    regards

    •   Alt9th June 2012, 19:18

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    Re: difference between co-pole and cross pole in antenna pattern

    Hi,

    The 'pole' is polarization.

    So, one electromagnetic wave can be characterized by her polarization of the electrical field (E-field) :
    in the orthogonal plane of propagation, the E-field can be moving in several ways.

    If the E-field describes one ellipse : the polarization is elliptical
    If the E-field describes one circle (heliax in reality, versus of time) : the polarization is circular left-hand or right hand.
    If the E-field describes one straight line : the polarization is linear.

    http://en.wikipedia.org/wiki/Polarization_(waves)

    But the polarization wave of any antenna is not perfectly.
    Example, one antenna that works in left-hand polarization (co-polarization) has one component, the 'cross polarization' (much smaller) of right-hand polarization.
    This cross-polarization is radiated like the co-polarization and can be observed through the patterns radiation.

    Look on courses or the web the link between 'AXIAL RATIO' and 'CO/CROSS POLARIZATION'.

    BR



    •   Alt11th June 2012, 15:06

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    Re: difference between co-pole and cross pole in antenna pattern

    hi
    then the desire polarization is same co-pol?
    am i right?



    •   Alt11th June 2012, 18:32

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    Re: difference between co-pole and cross pole in antenna pattern

    Quote Originally Posted by redcrystalline View Post
    hi
    then the desire polarization is same co-pol?
    am i right?
    Yes; "co" in this case means "the same", so "co-pol" = "the same" polarization.

    This term looks to be borrowed from another radio field where "co-channel" means "the same channel" (as opposed to, or in contrast to, 'the adjacent' channel, which is the next channel up or down from the present 'channel' under consideration.)

    RF_Jim


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    Re: difference between co-pole and cross pole in antenna pattern

    thanks RF_Jim



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