Digital Signal Processing Reference
In-Depth Information
Fig. 10.13
Shunt capacitor added to the input microstrip access lines between points
3
and
4
of
the previous figure
Table 10.3
Summary of the
measured SOLT S parameters
for the matched power
amplifier at 5.2 GHz
Parameter
Value
Parameter
Value
S
11
0
.
06
∠
125°
Z
11
(
)
54
.
2
+
i6
.
3
S
22
0
.
07
∠
53°
Z
22
(
)
46
.
4
+
i4
.
7
S
11
(dB)
−
22
.
8
S
21
(dB)
8
.
04
S
22
(dB)
−
24
.
23
S
12
(dB)
−
16
.
55
below the later without taking into account the ohmic losses in the microstrip ac-
cess lines. A comparison of Figs.
10.3
and
10.4
to
10.14
,ofFigs.
10.5
to
10.15
, and
of Tables
10.1
to
10.3
shows that the objective of a simultaneous conjugate match
was achieved, resulting in an increase of over 5 dB in power gain. This validates
the techniques described as a thorough, practical and systematic procedure that can
help in the implementation of impedance matching networks for printed-circuit RF
amplifiers.
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