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The choice of open or shorted stubmay depend in practice on a number of factors. In many cases it is also convenient toselect the same characteristic impedance used for the main line,although this is not necessary. The transmission line realizing the stub is normally terminated by ashort or by an open circuit. The drawback of this approach is that if the load ischanged, the location of insertion may have to be moved. The location of the stub with reference to the load dstubĪny load impedance can be matched to the line by using singlestub technique. There are two design parameters for single stub matching: © Amanogawa, 2000 – Digital Maestro Series 180