Page 252 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

244
6.

:
(4' , C "$ " " !
' ( , " " !
L
L C "$ " 4'(

' ( , " 4'(
กN :
n , n
, F "$ " " !7' # , " " !7'
F H L
n "$ (!'" !; 3 dB ก 48
−

4' 6.1 " 4'(
(Normalize) ก S 4 2 24

2
2
Ω
ก S 4 4 (R = 1 )
L
π R S C L C n 3 L n 4 C n 5 L n 6 C n 7 L
8
n
1 n
n
2
n = 2 1.4142 1.4142 - - - - - -
−
( 90) 1
n = 3 1 1.0 2.0 1.0 - - - - -
n = 4 0.7654 1.8478 1.8478 0.7654 - - - -
−
( 180) 1
5 0.6180 1.6180 2.0 1.6180 0.6180 - - -
n = 1
6 0.5176 1.4142 1.9319 1.9319 1.4142 0.5176 - -
n = 1
n = 7 1 0.4450 1.2470 1.8019 2.0 1.8019 1.2470 0.4450 -
n = 8 1 0.3902 1.1111 1.6629 1.9616 1.9616 1.6629 1.1111 0.3902

* " L C
R = 1 Ω " " !7' ( 3 dB ก 48)
−
n
L
n

! 6.7 # 4' 6.19 ก ก S 4 2 24 : ก 2 31 (

Ω
$ ก n = 4, R = 50 , R = 50 Ω F = 8 MHz
L
H
S
E
S

# 4' 6.19 ก S 4 2 24 n =
4

"# $ ก 4' 6.1 !$ $ ก n = 3 " ! 4' 6.2
4

4' 6.2 " & !$ $ ก n = : ก 2 31
4

π R C 1 n L n 2 C n 3 L n 4 C n 5 L n 6 C n 7 L n 8
S
n = 4 1 0.7654 1.8478 1.8478 0.7654 - - - -
−
( 180)

ก

ก
ก