robismyname
Full Member level 6
- Joined
- Jan 17, 2008
- Messages
- 390
- Helped
- 11
- Reputation
- 22
- Reaction score
- 9
- Trophy points
- 1,298
- Location
- Central Florida
- Activity points
- 4,603
For S22 "output reflection coefficient" measurement it is explain in text that:
b2 = S21*a1 + S22*a2
a1 = 0 because ZS=Z0 sets Vs=0
so....... S22 = b2/a2
my question is, is Vs zero from the perspective of looking at port 2?
What I dont understand is how can Vs be 0 since Zs and Zo are perfectly matched doesnt that suggest that there is signal/wave flow from source to input of two port device?
The only way I could come close to making this make sense was to envision that since Zs = Zo no part of the wave will be seen on the output side of the two port device so because of that from the port 2 side of the VNA Vs looks like 0.
Can anyone explain it better or scrutinize my rationale for accuracy?
b2 = S21*a1 + S22*a2
a1 = 0 because ZS=Z0 sets Vs=0
so....... S22 = b2/a2
my question is, is Vs zero from the perspective of looking at port 2?
What I dont understand is how can Vs be 0 since Zs and Zo are perfectly matched doesnt that suggest that there is signal/wave flow from source to input of two port device?
The only way I could come close to making this make sense was to envision that since Zs = Zo no part of the wave will be seen on the output side of the two port device so because of that from the port 2 side of the VNA Vs looks like 0.
Can anyone explain it better or scrutinize my rationale for accuracy?
