When I'm using Smith Charts, I often have to draw constant reflection coefficient circles.We are focusing on lossless transmission lines right now. I don't know if I'm just overthinking things because I do have some fairly specific questions: I'm taking a RF Fields and Waves class right now and I just needed some help understanding some of the concepts in transmission line theory and how it relates to Smith Charts. Send the moderators a message and we can unblock it as soon as possible. If the problem is truly an engineering problem, we'll allow it, but fixing your laptop or a cracked LCD screen doesn't qualify.ĭo not post Discord links, surveys, or job postings (with the exception of the monthly job post).Ĭan't find your submission? It was probably caught by reddit's spam filters. Tech support help can be found in /r/gadgets. If you have specific, targeted questions regarding homework, we will help you out only if you have provided some beginning work.
Power, electronics, electromagnetics, semiconductors, software engineering, embedded systems - all topics relevant to this field, professional or academic. The open-circuit stub location in wavelengths from the amplifier load interface is a function of the clockwise angular difference between point "A" and GammaL.Discuss anything related to the field of Electrical and Computer Engineering. 'BackgroundColor', 'Position',)Īnnotation(container, 'arrow',) Calculate the Stub Location and the Stub Length for the Output Matching Network 'HorizontalAlignment', 'center', 'FontSize',8. These reflection coefficients are measured at the amplifier interfaces.Ĭircle(amp,freq, 'Gamma',abs(GammaL),hsm) Calculate and Plot the Complex Load and Source Reflection CoefficientsĬalculate and plot all complex load and source reflection coefficients for simultaneous conjugate match at all measured frequency data points that are unconditionally stable.
This example uses the YZ Smith chart because it's easier to add a stub in parallel with a transmission line using this type of Smith chart. At this location, the stub will negate the transmission line susceptance, resulting in a conductance that equals the load or source terminations. Movement along a transmission line is equivalent to traversing a circle centered at the origin of the Smith chart with radius equal to a reflection coefficient magnitude.Ī single transmission line stub can be inserted at the point on a transmission line when its admittance (transmission line) intersects the unity conductance circle.
The center of the Smith chart represents a normalized source or load immittance.
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