Hi zorro
I have tried to analyze it in the same way as Pozar does it. He uses these normalized quatities. I have done exactly the same. At port 2 I have put in a resistor of normalized impedance Z=2 (100 ohm) in series with the source. As far as I see it, the analysis is almost the same, but I end up with the same S21 as if the power divider was matched. i.e. S21=1/√2
This is wrong, but I cannot come to any other result. I have attached the circuit for the even mode or this is how I see it.
Please comment if this is wrong or I have misunderstood something.
Thank you
Regards