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You are most welcome
does the Characteristic Impedance of a coax vary with frequency?
I suppose, in answer, I could cite a voltage wave that rises at 0.1 volt
per minute into a coax. You will understand that the coax looks quite resistive, at a rather high value in this case. And at the other end, if you shine a flash light into a coax, it will be reflected and absorbed like a (relative) short circuit.
So the short answer is 'Yes'.