A Background to Return Loss Measurement Return Loss Measurement
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 171
A Background to Return Loss
Measurement
Measuring the Reflected Power from a
Component with Known Reflection Factor
First, attach a component with a known reflection factor in place of
the DUT, and measure the power reflected. This component is called
the reflection reference.
Figure 108 Measuring the Power from a Component with a Known Reflection Factor
This measured power from the reflection reference is called P
Ref
.
The following two components are recommended for use as a
reflection reference:
• the Agilent 81610CC Reference Cable, or
• the Agilent 81000BR Back Reflector.
NOTE You can only measure the Front Panel Delta if you use a Reflection
Reference Cable.
The reflection factor for the component is called R
R
. Normally the
return loss for the component (RL
R
) is specified, but these values are
related:
Reflection
Reference
R
ref
M
ref
P
ref
Agilent 81610A
Reflectivity
P
in
P
r
RL
R
10 Rlog
R
–10
P
r
P
in
-------log–==
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