Circuit-slide-10

Circuit-slide-10 - There are two design parameters for...

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There are two design parameters for double stub matching: The length of the first stub line L stub1 The length of the second stub line L stub2 In the double stub configuration, the stubs are inserted at pre- determined locations . In this way, if the load impedance is changed, one simply has to replace the stubs with another set of different length. The drawback of double stub tuning is that a certain range of load admittances cannot be matched once the stub locations are fixed. Three stubs are necessary to guarantee that match is always possible.
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The length of the first stub is selected so that the admittance at the location of the second stub ( before the second stub is inserted ) has real part equal to the characteristic admittance of the line
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If one moves from the location of the second stub back to the load, the circle of the allowed normalized admittances is mapped into another circle, obtained by pivoting the original circle about the center of the chart. At the location of the first stub, the allowed normalized admittances
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This note was uploaded on 03/09/2012 for the course ECE 450 taught by Professor E.kudeki during the Spring '12 term at Illinois College.

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Circuit-slide-10 - There are two design parameters for...

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