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HELP! Explanation of smith chart on CPW simulation (ADS)

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asmodeus

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Hello guys. I tried to simulate a simple 50mm CPW line. The width of the conductor line is 140um and 64um the gaps (according to ADS linecalc to maintain 50Ohm impedance). I attcahed the smith chart results of simulations and the circuit. Can please someone explain me why it looks like that? Please I need a answer on that..... I used ADS software to simulate. From the other diagram the S12 seems to be low so i guess that the reflections are low, right?
 

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