R&S ZNH, User Manual

Page: 160 / 369

Vector Network Analysis
R&S
®
ZNH
153 User Manual 1334.5985.02 ─ 02
Figure 8-4: 2-port measurement with signal flows
a
1
= Incident wave at port 1
b
1
= Outgoing wave at port 1
b
2
= Outgoing wave at port 2
a
2
= incident wave at port 2
S
11
= Reflection coefficient of DUT, the ratio between b
1
and a
1
in a forward measurement with matched
DUT port 2, i.e S
11
= b
1
/ a
1
, if |a
1
| > 0 and a
2
= 0
S
21
= Forward transmission coefficient, the ratio between b
2
and a
1
in a forward measurement with matched
DUT port 2, i.e S
21
= b
2
/ a
1
, if |a
1
| > 0 and a
2
= 0
S
12
= Reverse transmission coefficient, the ratio between b
1
and a
2
in a forward measurement with matched
DUT port 1, i.e S
12
= b
1
/ a
2
, if |a
2
| > 0 and a
1
= 0
S
22
= Reflection coefficient of DUT port 2, the ratio between b
2
and a
2
in a forward measurement with
matched DUT port 1, i.e S
22
= b
2
/ a
2
, if |a
2
| > 0 and a
1
= 0
Figure 8-5: S-parameters measurements in quadrant measurement trace windows display
1 = Trace label
2a, 2b, 2c, 2d = Up to four different combinations of Measurement trace window
3 = Trace measurement
4 = Selected trace
5 = Same start and stop horizontal domain (e.g. frequency)
Performing Vector Network Analysis Measurements