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Inset Feed Calculation Patch Antenna

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Antenna (^.^)

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I would like to calculate the inset feed dimensions for my patch antenna,
Peak Impedance (impedance at edge) is 155.9072 +50.9807j.

I rearrange the formula:
inset feed formula.PNG
with 50 ohms being the one you want, Zin(R).

My question is, in the calculation,
for the other impedance value Zin(0), should I use 155.9072, or the magnitude of impedance (i.e sqrt(155^2 +50^2))?
 

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