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Patch feed calculation

Hi All,
Everybody speak and write about patch feed and their experiences.
Can anyone tell me how you can calculate a patch feed, please with some
formula and maybe parameter analysis?
For example i want to design for a 20db parabol Antenna with a f/D ratio 0.5
and an efficiency of 50% a Patch feed, now how i begin with it without any
self doing experiment but with calculation by formula and a little bit Math?
For Analyzing and optimization i can use eg. EZNEC or other.
73 Joubin

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