R&S
®
ZVA/ZVB/ZVT Screen Elements
1145.1084.12 3.25 E-1
Examples for special points in the inverted Smith chart:
• The magnitude of the reflection coefficient of a short circuit (Y = infinity, U = 0) is one, its phase is
–180
0
.
• The magnitude of the reflection coefficient of an open circuit (Y = 0, I = 0) is one, its phase is
zero.
Measured Quantities and Display Formats
The analyzer allows any combination of a display format and a measured quantity. The following rules
can help to avoid inappropriate formats and find the format that is ideally suited to the measurement
task.
• All formats are suitable for the analysis of reflection coefficients S
ii
. The formats SWR, Smith and
Inverted Smith lose their original meaning (standing wave ratio, normalized impedance or
admittance) if they are used for transmission S-parameters, Ratios and other quantities.
• The complex Impedances, Admittances, Z-parameters, and Y-parameters are generally
displayed in one of the Cartesian diagrams with linear vertical axis scale or in a polar diagram.
• The real Stability Factors, DC Inputs, and the PAE is generally displayed in a linear Cartesian
diagram (Lin Mag or Real). In complex formats, real numbers represent complex numbers with
zero imaginary part.
The following table gives an overview of recommended display formats.
Complex dimensionless
quantities:
S-parameters and ratios
Complex quantities with dimensions:
Wave quantities, Z-parameters, Y-
pParameters, impedances, admittances
Real quantities:
Stability factors, DC
input 1/2, PAE
Lin Mag
(default for Z-parameters, Y-
parameters, impedances, admittances)
(default)
dB Mag
(default) (default for wave quantities)
–
Phase
–
Real
Imag
–
Unwrapped
Phase
–
Smith
(reflection coefficients S
ii
)
– –
Polar
– –
Inverted Smith
(reflection coefficients S
ii
)
– –
SWR
(reflection coefficients S
ii
)
– –
Delay
(transmission coefficients
S
ij
)
– –
The default formats are activated automatically when the measured quantity is changed.
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