Why S11 Not Equal to Return Loss?

This video explained why Return loss is always positive value, and Why S11dB is not equal to Return loss?
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[@eilishchristine7976]

That's easy, just change the Y-axis to S11dB then can plot in "-" value. Just no sure why some articles name the Y-axis as return loss and make it so confusing. 😂

[@LYSStuff]

Yes, you are right. It just depend how we wanna plot our graph in S11dB or Retrun Loss.