Ken Kundert
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Your transmission line explanation is correct. Your colleagues explanation is a bit off: they are explaining why you specify the port voltage magnitude to be unity, not why there is a doubling from the specified value to the internal drive voltage.
Basically, when you specify the port voltage, you are specifying the that will result when the port is loaded with a matched load. This is the exactly the same thing you do when you specify the voltage on a high-frequency signal generator. If you connect an hp8640 signal generator to an oscilloscope and set it to deliver 1Vp, you will see a 2Vp signal on your oscilloscope until you remember to enable the 50Ω terminating resistor on the scope, at which point you see a 1Vp signal.
The same would be true from a 1Vp signal coming from an antenna.
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