Environmental Engineering Reference
In-Depth Information
0.6
|
S
11
, ref
(
f
)|
T
w
= 100 ns (filtered data)
T
w
= 100 ns (without filter)
0.5
0.4
0.3
0.2
0.1
0.0
0.81
0.84
0.87
0.90
0.93
0.96
f
(GHz)
Fig. 6.9
Comparison between the
measured through the TD/FD combined approach
(with and without the application of the digital filter) and the
|
S
11
(
f
)
|
|
S
11
,
ref
(
f
)
|
frequencies. On the other hand, when exploring a limited frequency bandwidth, as
in the considered test-case, the optimal time windowing (for the considered AUT)
is 30 ns
<
T
w
<
35 ns.
6.5
Biconical Antenna Results
As a further experimental validation of the method, the second considered antenna
was a biconical antenna (Fig. 6.1(b)), generally used for Electromagnetic Compati-
bility (EMC) measurements: the wideband characteristics of this antenna anticipate
different criteria for the choice of the optimal time window [15].
Similarly to the previous case, the TDR measurements on the antenna were per-
formed by choosing several time windows, ranging from 15 ns to 150 ns; once again,
the corresponding
S
11
(
f
)
was extrapolated and compared to the
S
11
,
ref
(
f
)
in terms
of
rmse
(Table 6.2).
Ta b l e 6 . 2
rmse
values between
|
S
11
(
f
)
|
measured (for different acquisition windows)
through the TD/FD combined approach and
|
S
11
,
ref
(
f
)
|
, for the biconical antenna
T
w
rmse
(ns)
150
0.010
100
0.006
80
0.007
40
0.010
35
0.013
15
0.019
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