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Smith Chart

April 22nd Fact-of-the-Day

A Smith Chart, also known as a Smith Diagram, is special type of chart that was developed to enable easy graphic solution of many types of otherwise rather difficult radio-frequency transmission line and waveguide problems. It has polar coordinates and the following sets of lines: 1) constant resistance circles; 2) constant reactance circles; 3) constant standing-wave-ratio circles; and 4) radius lines representing constant line-angle loci. Normalized quantities are plotted by users for maximum flexibility and to facilitate easy comparisons. The short time that is required to learn to use a Smith Chart is an excellent investment for anyone interested in correctly matching transmission lines or waveguides to antennas and radio equipment. ©2005 Martek International All rights reserved.

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