阻抗匹配和阻抗转换
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©2003 Fabian Kung Wai Lee Thin film inductor (0603)Coil inductor (0805)
(0805)(1210)(1210), Y5V dielectric (0603), NPO dielectric
©2003 Fabian Kung Wai Lee
Passive Lumped Components for Incorporation into PCB and other Substrates
2003 Fabian Kung Wai Lee 11
12
Z L
Single Lumped Element
Transformation Network Cont...
July 2004©2003 Fabian Kung Wai Lee Re(Z s )Im(Z s )We see that the matching
network only transform Z
to 50+j40 at 410MHz, at other frequencies, Z deviates from the desired
value.
410MHz
•Within a range of frequencies near to the operating frequency f o =410MHz, Z s =R s + jX s is quite near the desired value. We will call this range of frequency the bandwidth (BW) of the transformation network.July 2004©2003 Fabian Kung Wai Lee | and Arg(Z s ) is very close to the pattern of series RLC circuit
near operating frequency f o magnitude and phase.|Z s |Arg(Z s )271.76MHz 4.90≅Ω==9.63410o o Z MHz f
July 2004©2003 Fabian Kung Wai Lee Z s B X 764.1Constant Q n
Q n=3.0
Q n=1.0
Q n=0.5
Q n=0.5
Q n=1.0
Q n=3.0
July 2004©2003 Fabian Kung Wai Lee
2003 Fabian Kung Wai Lee 40
n Q n =3
Q n =3
B 1X 1
X 2
2003 Fabian Kung Wai Lee 41
Q n =5
Q n =5
B 1X
1
X 2
July 2004©2003 Fabian Kung Wai Lee R s R s X s X s Q n =3
Q n =5
Resonance Frequency Versus f from Simulation with
PSPICE
2003 Fabian Kung Wai Lee 47
Smith chart to aid the design. Synthesize the circuit.
SWR circle Z’
θ
B 1Z s Z L Example 6 Cont...
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B 1TL 2
B 2
TL 1
The stubs
Maury Microwave Corp.
53