Environmental Engineering Reference
In-Depth Information
Fig. 2.4 Schematic of a
microstrip line
ln 8 h
120
π
w
4 h
=
w +
Z ms
ε
(2.14)
eff
whereas for 1
<
w
/
h
<
20
w
h +
667 ln w
h
49 1
120
π
Z ms
=
ε
1
.
393
+
0
.
+
1
.
(2.15)
eff
where
ε eff is the effective permittivity; w is the width of the microstrip; and h is the
thickness of the substrate [26].
2.2
Reflected Waves
Let us consider a Z 0 -impedance TL, terminated with a generic load impedance, Z L
(FIg. 2.5). When Z L does not match Z 0 , part of the incident wave is absorbed by the
load, and the rest is reflected along the line.
Fig. 2.5 TL connected be-
tween the generator and the
load
At any point on the line, the reflected voltage is given by [25]
V R = Γ
V I
(2.16)
 
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