Electronic Applications of the Smith Chart: In Waveguide, Circuit, and Component Analysis

Chapter 13: Special Uses of Smith Charts

13.1 Use Categories

The many uses of the SMITH CHART may conveniently be classified as "basic," "specific," and "special." The more common uses in the first two categories, in which procedures for solving problems will be evident from the material which has been presented in previous chapters, are listed below. These lists are followed by descriptions of some of the more important "special" uses of this chart.

13.1.1 Basic Uses

  1. For evaluating the rectangular components, or the magnitude and angle of the input impedance or admittance, voltage, current, and related transmission-reflection functions, at all positions along a uniform waveguide. These related transmission-reflection functions include:

    1. Complex voltage and current reflection coefficients.

    2. Complex voltage and current transmission coefficients.

    3. Power reflection and transmission coefficients.

    4. Reflection loss. e. Return loss.

    5. Standing wave loss factor.

    6. Amplitude of maximum and minimum of voltage and current standing wave, and standing wave ratio.

    7. Shape, position, and phase distribution along voltage and current standing waves.

  2. For evaluating the effects of waveguide attenuation on each of the above parameters and on related transmission-reflection functions at all positions along a waveguide.

  3. For evaluating input-output transfer functions.

13.1.2 Specific Uses

  1. For evaluating the input susceptance or reactance of open- or short-circuited waveguide stubs.

  2. For evaluating the effects of shunt susceptances or conductances, or series reactances or resistances, on the input admittance or impedance, respectively, of waveguides.

  3. For displaying or evaluating the input impedance or input admittance characteristics of resonant or antiresonant waveguide stubs, including bandwidth and Q, or inversely, for determining...

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