antenna power feed



hi all
i would be thankful for ur help on power coupling issues in antenna (rf
section )
i need to design a coil for the frequency concerned (f=1/(2pi sqr
root(lc)) and feed the power to antenna.
the problem comes in getting correct inductance coil designing and
testing its value
and secondly
why the point of tapping power for antenna needs to be done at
particular point on coil (i.e. like, one and half turns from positive
feed)
thanking you all.

.



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