20 | Keysight | E4991B Impedance Analyzer - Data Sheet
Option E4991B-002 Material Measurement (Typical)
(continued)
Δ['r m
['rm
1
0.002
Eb
=
['
•
+
tand
r m
100
t
f
=
=
Measurement frequency [GHz]
t
Thickness of MUT (material under test) [mm]
[‘r m
=
=
Measured value of [‘r
tand
Measured value of dielectric loss tangent
Typical accuracy of permeability parameters:
µr’ accuracy
Δµ'r m
µ' r m
=
:
2
f 2
0.02 25
15
[%]
4 +
+ Fµ'r m 1 +
×
f
Fm´r m
Fµ'r m
(at tand < 0.1)
•
Loss tangent accuracy of µr (= Δtand):
±(Ea + Eb ) (at tand < 0.1)
where,
0.002 + 0.001 + 0.004f
Fµ'r mf
Ea
Eb
=
=
=
=
=
=
=
=
Δµr m
µ'r m
'
tand
100
•
f
Measurement frequency [GHz]
h ln c [mm]
F
h
b
c
b
Height of MUT (material under test) [mm]
Inner diameter of MUT (material under test) [mm]
Outer diameter of MUT (material under test) [mm]
Measured value of µ’r
µ’r m
tand
=
Measured value of loss tangent
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