Agilent Technologies PSA Series - 2.1.2 Attenuation

34 Chapter 2
Measurement Concepts
Equations and Conversion Table
Measurement Concepts
Equations and Conversion Table
Figure 2-1 Transmitted and Reflected Power with a DUT
Reflection coefficient is actually a complex quantity (
Γ). But a tracking
source/spectrum analyzer system only makes scalar measurements (
ρ).
stimresp.vsd
Device Under Test
(DUT)
Incident Transmitted
Reflected
Insertion Loss or Gain 20log
V
transmitted
V
incident
------------------------
=
Reflection Coefficient ρ
V
reflected
V
incident
--------------------=
Return Loss 20–logρ=