50 ohm characteristic impedance.

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1a2s3d4f

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Hi everyone,

I don't understand the reason that most RF wireless transmission systems optimized for power transfer are 50-Ω characteristic impedance systems. Can someone explain this for me.

Thanks
 

The choose of 50 Ohm originates from the fact that this value was the characteristic impedance of the "optimum (*) coax cable" (with air dielectric) used for early radio transmitters, therefore it was adopted as reference value.

(*)
Optimum in the sense that this value represents a good compromise between max power handling and linear loss requirements.

Regards

Mowgli
 

1a2s3d4f,
It turns out that the optimum value is 51 Ohms. For an excellent article on this subject, go to
.
. **broken link removed**
Regards,
Kral
 

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    1a2s3d4f

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there are different matchings at 50 ohm or 75 ohm. This is because the reflection is minimum when there is matching in impedences.
 

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