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The measurement reference for the incident energy is the point at
which the device connects to the measurement system. We call this
point the reference plane. The incident energy at the reference plane is
defined as having a magnitude of 1 and a phase of 0 degrees. We es-
tablish this during the calibration.
The ratio of reflected and transmitted energy to the incident energy
can be represented by a number of different measurements and units,
as shown below.
The default display for reflection measurements is the Smith chart.
The default display for transmission measurements is the Log Magni-
tude and Phase graph.
The Smith chart is a convenient way to display device impedance and
is a useful aid for the graphical design and analysis of microwave cir-
cuits (Figure 8-5).
TRANSMISSION AND REFLECTION
MEASUREMENTS
8-8
37XXXC OM
P H A S E
M A G N I T U D E
I M A G I N A R Y
R E A L
R E F L E C T I O N C O E F F I C I E N T =
R E F L E C T I O N ( M A G N I T U D E )
I N C I D E N T ( M A G N I T U D E )
P H A S E = I N C I D E N T ( P H A S E ) - R E F L E C T E D ( P H A S E )
Figure 8-4.
Magnitude/Phase Vector
50
INDUCTIVE
CAPACITIVE
SMITH CHART
Ω
Figure 8-5
Smith Chart Display 1
REFERENCE PLANE
Defined At the Test Port Measure-
ment Plane As
Magnitude = 1
Phase = 0 Degrees
Established During Calibration
MEASUREMENTS
Log Magnitude
Phase
Smith Chart (Impedance)
Group Delay (See paragraph 3-13)
Admittance Smith Chart
Linear Polar
Log Polar
Linear Magnitude
Real and Imaginary
Power Out
Содержание 37 C Series
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