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PCB Impedence - Why 50 Ohms???

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reachme09

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Can anyone tell me why do we use 50 Ohms Impedance in PCB signal layer and not 60 or 70 Ohms for non differential tracks??
 

50 Ohm is a industry standard for most of RF and Microwave design and measurements.
Because 50 Ohm is a compromise between 33 Ohm and 75 Ohm that theoritically gives you maximum power handling capability and minimum loss respectively.
So, 50 Ohm is a optimum point between these two..
 
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