"Reg Edwards" wrote in message
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Yes, Rho CAN exceed unity when the termination is a passive network.

For example, when on a real line, Zo = Ro - jXo and the termination Zt
= Rt + jXt then Rho can exceed unity.

Rho has an absolute maximum value which approaches 1 + Sqrt(2) =
2.4142 which occurs when the angle of Zo approaches -45 degrees and Zt
is purely inductive.

It arises because of a weak resonant effect between -jXo and + jXt.

The angle of Zo of real lines always becomes more negative as
frequency decreases. Mr Smith's Chart does not recognise this. He did
it knowingly and deliberately. There are other departures from
reality. But at least it is fit for its few intended purposes.
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Reg, G4FGQ

That is exacly what is in a book I have.

Tam