

You’ll learn a unique way of impedance matching using Smith chart, and you will also be directed to where you can get a powerful spreadsheet which will help you get the matching job solved within a fraction of a second with very minimal effort. If you can follow those 6 examples easily, then you are good to go to answer the questions below, and, once you get them done correctly, you can continue to learn the most exciting application of Smith chart, impedance matching. You don’t need to remember those equations by heart but you should know how to apply them without any difficulty, whenever you need to use it to conveniently solve impedance and reflection issues. With any one of these 3 parameters given, you can read the other 2 in the chart simultaneously with a very reasonable accuracy. Now, you have learned all basics of Smith chart and you know the chart is consisted of 3 very basic parameters, \(Γ, z, y\), and they can be converted among each other based on a few sophisticated equations. We’ll work on examples and then ask questions. On the other hand, an open circuitedstub may be more practical for certain types of transmission lines,for example microstrips where one would have to drill the insulatingsubstrate to short circuit the two conductors of the line.This article will be dedicated to examples and questions to find out how much you really know about Smith chart and enhance your understanding of this great chart.īut you should learn all Basic Parameters, Equations, and Plots first before continuing reading further here. A short circuitedstub is less prone to leakage of electromagnetic radiation and issomewhat easier to realize. 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
