I want to make array by unit cells which I designed. now I want to feed this array. and I will use

tapered microstrip transmission line. actually I calculated the width and length of the tapered microstrip line with the formula in papers. but I don't know how to optimize the line with HFSS. because I don't know what should be value of the Zin in array input point. my means input Characteristic Impedance for Microstrip transmission is Z0 = 50 but output Impedance for tapered microstrip transmission line value should be how much?.

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