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Without the short circuit the image theory still can be applied on inverted-L antenna.
But inverted-F antenna added short circuit btw radiator & ground.
What's the purpose of that short circuit ? Thanks.
the shorting pin or wall in a MSA, that converts it into a PIFA, is for making it suitable for use at lower freq. operations.suppose a Microstrip patch of resonant length L (approx= lambda/2 length) is shorted at the corner with a shorting pin,then the resonant length (quarter-wavelength)will be along half the perimeter of the patch,i mean lambda/4 = (L+W),i.e. resonant freq. = c/[4*(L+W)],where W is the width of the patch.the position of the pin is the null voltage point.
so this way or meandering the patch shape in different ways we can have a greater effective length for the current path ,and thus we can use it for lower freq. operations.
hope i the explanation is clear.if anything is wrong plz do mention.
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