Which Line on the Smith Chart Indicates SWR?

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SUMMARY

The Smith Chart is a graphical tool used in RF engineering to represent complex impedance. In the context of measuring Standing Wave Ratio (SWR), the first straight line at the bottom of the chart indicates the SWR value. The right side of this line corresponds to SWR, while the left side represents attenuation (ATTEN). SWR can be expressed in decibels (dBS), but this is optional and not the primary measurement.

PREREQUISITES
  • Understanding of RF engineering principles
  • Familiarity with the Smith Chart and its components
  • Knowledge of impedance and reflection coefficients
  • Basic concepts of Standing Wave Ratio (SWR)
NEXT STEPS
  • Study the detailed applications of the Smith Chart in RF circuit design
  • Learn how to calculate SWR using impedance values
  • Explore the relationship between SWR and return loss
  • Investigate the use of Smith Charts in antenna matching techniques
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RF engineers, telecommunications professionals, and anyone involved in antenna design or impedance matching will benefit from this discussion.

WolfOfTheSteps
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http://www.sss-mag.com/pdf/smithchart.pdf" , which scale at the bottom tells me the SWR?

Is it the top line or the second line? (Among the 4 straight lines at the bottom of the chart) I'm confused because on the right and left of the line there are two different labels (SWR and ATTEN). Also, is the units of SWR in dBS?

Thanks.
 
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The SWR is measured from the first line, yes you can measure the standing wave ratio in dBS but only if you want to (there is another scale, right??), only the right part of the first line is the SWR the left is ATTEN.
 

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