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Master1 Communication Micro-ondes
Adaptation à l’aide d’un Stub
Z L
d/λ
s/λPar :
D. Sayad
M1 Communication : Microondes D. Sayad
o
r = 1
Abaque de Smith
M1 Communication : Microondes D. Sayad
Exemple: Réaliser l’adaptation d’une charge : zL=2 – j 1.5
à l’aide d’un stub court-circuité.
d/λ= ?
s/λ= ? Z L
d/λ
s/λ
r = 2
x = -1.5
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
Cercle r = 2
Placement du point (2,-1.5)
r = 2
x = -1.5
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5 Cercle r = 2
Cercle x = -1.5
r = 2
x = -1.5
Placement du point (2,-1.5)
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
r = 2
x = -1.5
Placement du point (2,-1.5)
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
z = 2 – j 1.5
r = 2
x = -1.5
Placement du point (2,-1.5)
A
A: z = 2 – j 1.5
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
Déduction du coefficient de réflexion | |
Φ = -29.74°
= 0.54 (-29.74°) = 0.54 (-29.74°)
o
r = 1
r = 2
x = -1.5
M1 Communication : Microondes D. Sayad
Tracé du cercle de rayon | |
| |= 0.54
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
Tracé du cercle de rayon | |
| |= 0.54
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
g = 0.32
Détermination de l’admittance de charge yL
M1 Communication : Microondes D. Sayad
o
r = 1
r = 2
x = -1.5
g = 0.32
x = 0.24
yL = 0.32 + j 0.24
b = 0.24
B
B: yL = 0.32 + j 0.24
M1 Communication : Microondes D. Sayad
o
r = 1
y1 = 1 + j 1.27
•Détermination du point d’intersection avec le cercle unité y = 1.
•Détermination de d/λ.
d/λ = 0.129
M1
M1: y1 = 1 + j 1.27
M1 Communication : Microondes D. Sayad
o
r = 1
y1 = 1 + j 1.27
y = 0 – j 1.27
Point de CC en admittance
•Détermination de s/λ.
S=0.106λ
Cas d’un Stub court-circuité
C
C: y = 0 – j 1.27
M1 Communication Micro-ondes
D. Sayad
Adaptation à l’aide d’un Stub
Z L
d/λ
s/λ
