Chapter 2 35
Measurement Concepts
Equations and Conversion Table
Measurement Concepts
Figure 2-2 Ranges and Relationships
Where: RL is the measured return loss value.
Note that a VSWR of 1 (sometimes referred to as 1:1) means that all of
the transmitted incident power is absorbed at the load and no power is
reflected back. (This assumes a perfect impedance match.) Similarly, an
infinite VSWR is for a perfect open or short, where all of the incident
power is reflected back.
Z L = 0 , ∞
Load
(Z
L - Device
Impedance)
Incident
Reflected
Z O - Transmission
Line Impedence
Z L = Z O
RL
ρ
SWR
∞ dB 0 dB
∞1
10
ranges.vsd
VSWR
V
max
V
min
------------
1 ρ+
1 ρ–
------------
110
RL–
20
----------
+
110
RL–
20
----------
–
-----------------------===
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