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Measurements of Standing Waves

Measurements of Standing Waves

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At radio frequencies where slotted waveguide or transmission line sections would be excessively long, probe measurements of the relative current (or relative voltage) amplitudes at discrete sampling points along the waveguide provide a convenient and practical technique for measuring the complex impedance and related parameters. The SMITH CHART is useful for interpreting and evaluating data obtained from such measurements as will be described herein. The principle is made use of in the SMITH CHART plotting board shown.

Chapter Contents:

  • 11.1 Impedance Evaluation from Fixed Probe Readings
  • 11.1.1 Example of use of Overlays with Current Probes
  • 11.2 Interpretation of Voltage Probe Data
  • 11.3 Construction of Probe Ratio Overlays

Inspec keywords: electric immittance measurement; high-frequency transmission lines; waveguides; radiofrequency measurement

Other keywords: Smith chart plotting board; transmission line sections; probe measurements; slotted waveguide; standing wave measurements; complex impedance measurement; radiofrequencies; discrete sampling points

Subjects: Waveguides and microwave transmission lines; Microwave measurement techniques; Impedance and admittance measurement

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