Statement: Articles reproduced or quoted on this site involve copyright issues, please contact the webmaster to handle.The wavelength scale is used in distributed component problems and represents the distance measured along the transmission line connected between the generator or source and the load to the point under consideration.In todays age with different software tools, things are a bit easier but if you go back to the periods before computers became this powerful, you will understand how difficult things were.
![]() Winsmith Smith Chart Software How To Make SenseWe will look into the types of smith chart, its construction and how to make sense of the data it holds.However, the Smith charts method of displaying data have managed to retain its preference over the years and it remains the method of choice for displaying how RF parameters behave at one or more frequencies with the alternative being tabulating the information. As a result of this, most RF Analysis Software and simple impedance measuring instruments include smith charts in the display options which makes it an important topic for RF Engineers. Based on this scaling, smith charts can be categorized into three different types. They are the most popular, with all references to smith charts usually pointing to them and others being regarded as derivatives. ![]() From basic electricity classes, you will remember that admittance is the inverse of impedance as such, an admittance chart makes sense for the complex parallel situation as all you will need to do is to examine the admittance of the antenna rather than the impedance and just add them up. An equation to establish the relationship between admittance and impedance is shown below. True to their relationship described by the relationship above, the admittance smith chart possesses an inverse orientation to the Impedance smith chart. Winsmith Smith Chart Software Series Components AndWhile the common impedance Smith Chart is super useful when working with series components and the admittance Smith Chart is great for parallel components, a unique difficulty is introduced when both series and parallel components are involved in the setup. Its a literally effective solution to the problem as it is formed by superimposing both the Impedance and Admittance smith charts on one another. In Impedance matching activities, it helps identify how a parallel or series component affects the impedance with less effort. Going back to basic electricity classes, you will remember that impedance is a sum of resistance and reactance and as such, is more often than not, a complex number, as a result of this, the reflection coefficient is also a complex number, since it is completely determined by the impedance ZL and the reference impedance Z0. The constant R Circles are essentially what you get when the Resistance part of the Impedance is held constant, while the value of X varies. As such, all the points on a particular Constant R circle represent the same resistance value(Fixed Resistance). The value of the resistance represented by each Constant R Circle is marked on the horizontal line, at the point where the circle intersects with it. The Innermost and Outermost Constant R Circles, represent the boundaries of the smith chart. The Innermost Circle(black) is referred to as the infinite resistance, while the outermost circle is referred to as the zero resistance. They are generated when the impedance has a fixed reactance but a varying value of resistance. The admittance relative to the impedance is given by the equation 1 above as such, the admittance is made up of Conductance and succeptance which means in the case of the admittance smith chart, rather than having the Constant Resistance Circle, we have the Constant Conductance Circle and rather than having the Constant Reactance circle, we have the Constant Succeptance circle. Creating the constant conductance plot of the smith using equation 3 above to obtain the reflection coefficient and plotting for different values of S, we get the smith chart shown below. If the variable S 4(Constant) and G is a real number, a plot of the Constant susceptance curve(red) superimposed on the Constant Conductance curve will look like the image below.
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