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- Chöông 2: ÑOÀ THÒ SMITH
I. Giôùi Thieäu
om
.c
ng
ZS
Z0 ZL
co
ES
x
an
0 x d l
th
ng
Γ( x), Z ( x)
o
du
u
cu
1
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- ZS
Z0 ZL
ES
x
om
0 x d l
.c
ng
co
an
th
o ng
du
u
cu
2
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- 1+ Γ
Z = Z0
1− Γ
Chæ Xeùt Trôû Khaùng ñaõ chuaån hoaù theo Z 0
om
Z 1+ Γ
.c
⇒ z= = = r + jx
Z0 1 − Γ
ng
co
Γ = Re(Γ) + j Im(Γ)
an
th
o ng
du
u
cu
3
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- om
.c
ng
co
an
th
o ng
du
u
cu
4
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- ⎧ r ⎫ 1
om
Taâm : ⎨ , 0 ⎬ , Baùn kính =
⎩1 + r ⎭ 1+ r
.c
ng
co
an
th
o ng
du
u
cu
5
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- om
.c
ng
co
an
th
o ng
du
u
cu
6
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- ⎧ 1⎫
om
1
Taâm : ⎨1, ⎬ , Baùn kính =
⎩ x⎭
.c
x
ng
co
an
th
o ng
du
u
cu
7
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- II. Ñoà Thò Smith
1) Moâ Taû Ñoà Thò Smith
om
.c
ng
co
an
th
o ng
du
u
cu
8
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- Im(Γ) Voøng Troøn
Caùc ñöôøng Ñôn Vò Γ = 1, r = 0
troøn ñaúng r
Phoái hôïp
trôû khaùng
om
Γ = 0, r = 1, x = 0
.c
Noái taét
ng
Γ = −1, z = 0 Hôû Maïch
co
r = 0, x = 0 Γ = 1, z = ∞
an
Re(Γ)
th
o ng
du
Caùc ñöôøng
u
cu
troøn ñaúng x
9
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- om
.c
ng
co
an
th
o ng
du
u
cu
10
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- om
.c
ng
co
an
th
o ng
du
u
cu
11
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- om
.c
ng
co
an
th
o ng
du
u
cu
12
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- Γ( x) = Γ(l ).e −2γ d
Voøng Troøn Ñaúng Γ
om
Γ(l )
.c
−2 β d
ng
co
an
th
ng
Γ( x)
o
du
u
cu
13
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- om
.c
ng
co
an
th
o ng
du
u
cu
14
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- om
.c
ng
co
an
th
o ng
du
u
cu
15
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- om
.c
ng
co
an
th
o ng
du
u
cu
16
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- om
.c
ng
co
an
th
o ng
du
u
cu
17
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- om
.c
ng
co
an
th
o ng
du
u
cu
18
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- 2) Ñaëc Tính
a) Bieåu dieãn daãn naïp treân ñoà thò smith
om
y = g + jb
.c
ng
1+ Γ
co
z=
1− Γ
an
1
th
−1
z −1 y −1
ng
y
Γ= ⇒Γ = =−
o
z +1 1 y +1
du
+1
u
y
cu
Quan heä giöõa Γ vôùi z, gioáng quan heä giöõa −Γ vôùi y
19
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- ñaúng b
z = r + jx
om
ñaúng g
.c
Γ
ng
co
an
th
ng
−Γ
o
du
u
cu
1
y = = g + jb
z
20
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