ogologol
Newbie
First, sorry for my bad English,
I have a question about the s parameter of the cascades system.
Assuming that there are two system A,B as shown in the figure and each has an s-parameter measured at 50ohm port,
I understand that the s-parameter of the A,B cascaded system can be calculated by signal flow graph analysis using the s-parameter of A and B.
However the s-parameter of system A,B are obtained with 50ohm port impedance attached to the system.
Why can I ignore this 50ohm port impedance when A and B are cascaded?
S-parameter is a value obtained when port impedance is attached in parallel to the port,
it is confusing because it seems to be used as if it is a response characteristics between port and port without port impedance.
I have a question about the s parameter of the cascades system.
Assuming that there are two system A,B as shown in the figure and each has an s-parameter measured at 50ohm port,
I understand that the s-parameter of the A,B cascaded system can be calculated by signal flow graph analysis using the s-parameter of A and B.
However the s-parameter of system A,B are obtained with 50ohm port impedance attached to the system.
Why can I ignore this 50ohm port impedance when A and B are cascaded?
S-parameter is a value obtained when port impedance is attached in parallel to the port,
it is confusing because it seems to be used as if it is a response characteristics between port and port without port impedance.