Circuit-slide-9

Circuit-slide-9 - There are two design parameters for...

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There are two design parameters for single stub matching : The location of the stub with reference to the load d stub The length of the stub line L stub Any load impedance can be matched to the line by using single stub technique. The drawback of this approach is that if the load is changed, the location of insertion may have to be moved . The transmission line realizing the stub is normally terminated by a short or by an open circuit . In many cases it is also convenient to select the same characteristic impedance used for the main line, although this is not necessary. The choice of open or shorted stub may depend in practice on a number of factors. A short circuited stub is less prone to leakage of electromagnetic radiation and is somewhat easier to realize. On the other hand, an open circuited stub may be more practical for certain types of transmission lines, for example microstrips where one would have to drill the insulating substrate to short circuit the two conductors of the line.
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Since the circuit is based on insertion of a parallel stub, it is more convenient to work with admittances , rather than impedances.
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In order to complete the design, we have to find an appropriate location for the stub. Note that the input admittance of a stub
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Circuit-slide-9 - There are two design parameters for...

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