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Why most of the antenna has an input impedance of 50 ohm

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sugart

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I am currently designing a bowtie antenna using ansoft hfss for my final year project. Can anyone help me to explain why does most of the antenna has an input impedance of 50ohm. Is 50ohm consider as an effective impedance matching?If yes why?
 

It is not true that most antennas have Zin=50 Ohm: it depends from the geometry of the antenna and frequencies involved.
50 Ohm is widely used in circuit design because it is a good compromise between power handling capability and signal loss per unit length, for air dielectric in coaxial cables used at the beginning of the wireless communications era.
For a good explanation see the link
**broken link removed**

So the adoption of this standard impedance value is not consequence of antennas.

Regards
Mowgli
 

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