Agilent Technologies 8753ET User Manual page 360

Operating Concepts
S-Parameters
Figure 7-3 S-Parameters of a Two-Port Device
S-parameters are exactly equivalent to these more common description terms, requiring
only that the measurements be taken with all test device ports properly terminated.
S-Parameter
S
11
S
21
S
12
S
22
7-22
Definition
b /a a = 0 Input reflection coefficient
2
1 1
b /a a = 0
2
2 1
b /a
a = 0
1 2 1
b /a a = 0 Output reflection coefficient
1
2 2
Test Set Description
Forward gain
Reverse Gain
Direction
FWD
FWD
REV
REV