5.matching and tunning
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IMPEDANCE MATCHING AND
TUNING
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Outline2
1. Matching with Lump Elements2. Single-stub Tuning
3. The Quarter Wave Transformer
4. Tapered Line
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Matching with Lumped Elements3
L- section: The simplest type of matching network with two possible
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Analytic Solutions (1)4
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Analytic Solutions (2)5
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6
Smith Chart SolutionsDesign an L- section matching
network to match a series RC load
with an impedance
Z L = 200 –
j 100 Ohm to a 100 Ohmline at frequency of 500 MHz
Solution
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Smith Chart Solutions
Solution
+j 0.7
Z =1-j
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Solutions8
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Outline9
1. Matching with Lump Elements2. Single-stub Tuning
3. The Quarter Wave Transformer
4. Tapered Line
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Single-stub Matching10
Uses a single open-circuited or short-circuited length of transmission l
connected either in parallel or in series with the transmission feed line
distance from the load
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Shunt stub11
Match load impedance Z L = 60 – j 80 Ohm to a 50 Ohm line
at frequency of 2 GHz using a single
shunt open-circuit stub
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Shunt stub12
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Shunt stub13
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Series stub14
Match load impedance Z L = 100 – j 80 Ohm to a 50 Ohm
line at frequency of 2 GHz using a
single series open-circuit stub
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Series stub15
Normalized load impedance:
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Series stub
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The Quarter-Wave Transformer18
Bandwidth for TEM lines
Characteristic of thel
/4 transformer
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Exponential Tapper20
At z = 0, Z (0) = Z 0 z = L, then
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Triangle Tapper21
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Homework22
Onsite 5.1a, 5.2a, 5.3, 5.5
Homework 5.1b, 5.2b, 5.4, 5.6, 5.13, 5.23
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Double Stub Matching23
Design a double stub shunt tuner to match
a load impedance Z L = 60 – j 80 Ohm to a 50 Ohm line at
frequency of 2 GHz. The stubs are open-
circuited stubs and are space l /8.
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Normalized load impedance:
Z L = 0.3 –
j 0.4
Double Stub Matching
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