Hello,In the plot below we see in photo 1 peaks I named 1 to 5.
I know the formula for discontinuety shown below and the signal is traveling at Z=v*t
The PCB has 5 sharp peaks.How can I unterpret the shape from this plot.
I tried as forllowing
1. 0-9ns we have 50Ohms
2.at 9ns we have 48Ohm peak
3.then at 9.25ns we have a deeper peak at 44Ohm
4. 44Ohm steady state from 9.4ns

purely looking at these pulses ,how do I know the shape of the transmission line?
Thanks.

 

how do I know the shape of the transmission line?

What do you mean "shape" (round, square, rectangular, oblong)?

 

Hello crutshow , In the lecture they said that a signal passes slower in lower caracteristic impedance.
Is there a theory supports that?
Thanks.

 

Hello crutshow , In the lecture they said that a signal passes slower in lower caracteristic impedance.
Is there a theory supports that?
Thanks.

Not that I'm aware of.

And what does that have to do with the "shape" of the transmission line?