Concepts and Features
R&S
®
ZNB/ZNBT
113
User Manual 1173.9163.02 ─ 38
This can be used to insert external components (e.g. external signal separating devi-
ces, power amplifiers etc.) into the signal path in order to develop custom measure-
ments, e.g. to test high power devices and extend the dynamic range.
Amp
Ext
Gen 1
VNA
2
1
Dual
Directional Coupler
DUT
Redefined Physical Port 1
a wave: b
1
b wave: b
2
Source: Ext Gen 1
Figure 4-3: Redefined physical port 1 (port 2 not used)
Amp
VNA
3
2
coupler
DUT
Redefined Physical Port 1
a wave: b
2
b wave: b
3
Source: Port 1
Redefined Physical Port 2
a wave: a
4
b wave: b
4
Source: Port 4
1
4
Figure 4-4: Two redefined ports
High Signal Power
When dealing with external signal amplification, make sure that
●
the signals fed to the analyzer are within the allowed range
●
during calibration the calibration standards meet the requirements in terms of their
power handling capacity
Attenuator pads can be used to adapt the power levels.
4.3.2 Impedance Parameters
An impedance is the complex ratio between a voltage and a current. The analyzer pro-
vides two independent sets of impedance parameters:
●
Converted impedances (each impedance parameter is obtained from a single S-
parameter)
●
Z-parameters (complete description of an n-port DUT)
Measurement Results
