L05_Matching Networks_Sp11 - EEL 4422 / EEL 6427 RF &...

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EEL 4422 / EEL 6427 RF & Microwave Circuits II Lecture #5 umped element matching network Lumped element matching network 1
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Need for matching networks Microwave amplifiers must be properly terminated at their inputs and outputs in order to ensure that they deliver maximum power to the load or operate in a certain desired way. A typical configuration: Transistor, in order to deliver maximum power to the Z 2 =50 load, must have the terminations and L . 1 Z 2 =50 1 Z 1 =50 V S + _ Transistor Input Matching Network Output Matching Network atching networks are impedance transformers LL Z, SS Matching networks are impedance transformers There are many matching network configurations (i.e. L-section, T network, π network, single stub, double stub, etc.) 2 What factors do favor one matching network design over another? bandwidth, loss, design simplicity, cost, practical implementation …
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An example to get started: Multi-element matching network This is a great example that shows which way to “move on the Smith chart” depending on whether it is an inductor/capacitor in series/parallel x= -1.1 b= -0.5 b=2.4 ZY Chart Rules: dding a series reactance produces a
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This note was uploaded on 01/24/2011 for the course ECE 6936 taught by Professor Mumcu during the Spring '10 term at University of South Florida - Tampa.

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L05_Matching Networks_Sp11 - EEL 4422 / EEL 6427 RF &...

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