R&S ZNB Series User Manual page 127

®
R&S ZNB/ZNBT
Table 4-3: Squared S-parameters
2
|a |
i
|b | 2
i
10 log|S
10 log|S
10 log|S
4.3.1.1 Multiport S-parameters
The multiport S-parameters extend the standard 2-port S-parameters to a larger num-
ber of incident and outgoing waves. For a 4-port DUT,
b
 
1
 
b
 
2
 
b
 3 
b
 
 
4
where again a
and the S-parameters are expressed as S
The indices of the S-parameters described so far number the output and input ports of
a DUT; the parameters are referred to as single-ended S-parameters. The S-parameter
description can also be used to differentiate between different propagation modes of
the waves at the output and input ports. This results in the so-called mixed mode S-
parameters. The analyzer measures either single-ended or mixed mode S-parameters.
4.3.1.2 Redefined S-parameters
The analyzer firmware allows you to redefine the physical VNA ports, simply by speci-
fying:
●
a reference receiver ("a wave")
●
a measurement receiver ("b wave")
●
a generator ("Source" VNA or external generator port)
As a consequence, the measured S-parameters and other measured quantities are
also redefined.
●
The receivers and generators can be freely assigned, but without reusing the same
(original) physical port in different (redefined) ports. See
Physical Ports
●
Redefined physical ports are global, persistent settings, i.e. they are valid for all
recall sets. A [Preset] does not reset the physical port configuration.
●
Redefining physical ports causes a factory reset.
The factory reset deletes all switch matrix RF connections.
User Manual 1173.9163.02 ─ 62
2
| = 20 log|S |
ii ii
| 2 = 20 log|S |
21 21
2
| = 20 log|S |
12 12
S S S S

11 12 13

S S S S


21 22 23

S S S S
 31 32 33
S S S S


41 42 43
(i = 1 to 4) denote the incident, b
i
dialog",
Available incident power (= the power provided by a generator with
a source impedance equal to the reference impedance Z
port i=1,2
Reflected power at DUT port i=1,2
Reflection loss at DUT port i=1,2
Insertion loss of forward transmission
Insertion loss of reverse transmission
a
  
14 1
  
a
  

24 2
  
a
34   3 
a
  
  
44 4
(i = 1 to 4) denote the outgoing waves,
i
(i,j = 1 to 4).
ij
on page 791.
Concepts and features
Measurement results
) at DUT
0
Chapter 5.18.5.2, "Define
127