Why 50 ohms?

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http://www.microwaves101.com/encyclopedia/why50ohms.cfm
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Amr Ali

Hi,
I'm currently designing a UWB patch antenna using CST MWS. I got all the results i want such as S11,radiation pattern etc. The line impedance of my antenna also got 50 ohms. But what is confusing me is the smith chart not all 50 ohms at my desired frequency (3.1 - 10.6 GHz). Is smith chart still important since i already got 50 ohms at line impedance? And what would happen to the fabricated antenna if the smith chart not 50 ohms?