諧振電路q
Microwave & Communication Lab.
1
¤j
(Series Resonance) (Parallel Resonance)
Microwave & Communication Lab.
2
q§Pwq
(Bandwidth)wq°±a (Passband) -° 3dBWvdòC Q-wq°
¤ Wv Q= 3dBWe q§xs¤ à =ω× q¤§\v
Microwave & Communication Lab.
3
q§Pwq
ZS=RS+jXSA-Y°qP êpAh
1 2 I ωL S ωLS X S 2 QS = = = 1 2 RS RS I RS 2
LS q
RS
RS
XS
YP=GP+jBPA-Y°qe RP¨pAh
1 2 V ωC P ωC P B P R P 2 QP = = = = 1 2 GP GP X P V GP 2
C P P q
RP XP
Microwave & Communication Lab.
4
q§Pwq
RP
RS XS
XP
Q-¤A§Y
Microwave & Communication Lab.
RP Q = QS = Q P = R 1 S XS QS = =p ê § ¨¤ RS RP QP = = XP
1
2
Q- Q
5
q§Pwq
(ò
i Yz-W¤ o ±D¨H p ê P p ¨ ¤à§
RP = (Q + 1) RS ,
2 S
)
RP XP = QP
XP ≈ XS
-Y QS>>1h A
2 RP ≈ QP RS ,
P Az Y-
QP>>1h A
XS ≈ XP
6
RP RS ≈ 2 , QP
Microwave……