More generally, take any matched transmission line (VSWR=1) and cut it for two open circuits. The source impedance should "see" a conjugate match, for maximum power transfer. setup to look like the complex conj at the input. Hopefully this makes it clearer why you want your whole T.L. Now extend the load impedance out 50 meters (e.g.) and attached a 50 ohm load. The RF Fundamentals with MATLAB/SIMULINK Applications course emphasizes RF fundamentals in terms of physical principles and behavioral concepts permitting the student to quickly gain an intuitive understanding of the subject with minimal mathematical complexity. Plot Reflection Data On a Smith Chart Plot Impedance Data On a Smith Chart Draw a Blank Smithchart Input arguments. The question you are asking is, should the input impedance look like the source impedance or the complex conjugate of that impedance? Well just draw yourself a source with a source and load impedance. RF Toolbox Visualization and Data Export smithchart On this page Syntax Description Examples. Your second interpretation is correct, and it partially says it right there in the question prompt ) Both ends need to be cojugately matched, but your start point depends on which direction you are looking down the transmission line. Line Specification Color Specification Version History. Plot Reflection and Impedance Data on Smith Chart Input arguments. It sounds like you are on the right track. RF and Mixed Signal RF Toolbox Visualization and Data Export smithchart On this page Syntax Description Examples. The Smith Chart is the most used tool for microwave engineers to visualize complex-valued quantities and calculate the mapping between them. It is the circular plot of the characteristics of microwave components. Since a stub is a reactance (capacitive if open, inductive if shorted to ground(plane)), the stub combined with a delay (length of transmission line) creates this matching network.Īs mentioned I have a complex source impedance which needs conjugately matched to a 50 Ohm load using a single stub on microstrip. The Smith Chart is the graphical representation of a complex mathematical equation. The matching impedance is circuit that is defined by the combination of these circle values (R, X and theta) Once you grok this, it all becomes fairly obvious.įind the complex Thèvenin source impedance on the Smith chartįind a path along the circles "Manhattan Path"-wise to the center via lines of constant resistance, constant reactance and linear phase The Smith Chart is the conformal transform between lumped impedance and distributed transmission lines. The key is to understand what a Smith Chart really is and what the various circles mean physically. The RF domain uses many types of data files, including industry-standard Touchstone files (. Somewhere I answered this on Reddit but it's too many messages ago.
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