Rohde & Schwarz R&S ZNA Series - Series transmission impedance; Parallel transmission impedance

Concepts and features
R&S
®
ZNA
155User Manual 1178.6462.02 ─ 29
Example:
For a 2-port DUT that is terminated at its output with the reference impedance Z
02
, Z
11
is the input impedance (matched-circuit impedance measured in a forward reflection
measurement).
A converted impedance Z
11
completely describes a one-port DUT.
The calculation formula of the converted reflection impedances Z
ii
depends on the
waveguide circuit theory according to which Reference impedances are calculated.
Table 4-5: Calculation of Converted Reflection Impedances
Traveling Waves Power Waves
Series transmission impedance
A two-port transmission parameter Z
ij
(i ≠ j) can describe a pure serial impedance
between the two ports.
U
0
I
1
I
2
U
1
U
2
U
0
Z
0j
Z
ij
Z
0i
The calculation formula of a converted serial transmission impedance Z
ij
depends on
the waveguide circuit theory according to which Reference impedances are calculated.
Table 4-6: Calculation of Converted Series Transmission Impedances
Traveling Waves Power Waves
Parallel transmission impedance
A two-port transmission parameter Z
ij
(i ≠ j) can also describe a parallel impedance
between the two ports.
Measurement results