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2 - Waveguides

Published online by Cambridge University Press:  27 April 2018

Richard G. Carter
Richard G. Carter
Affiliation:
Lancaster University
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Summary

The r.f. and microwave power generated by vacuum tubes is transmitted through waveguides. The properties of the coaxial lines, and rectangular, ridged and circular waveguides commonly used in high power systems are discussed. Coaxial lines can support the transverse electric and magnetic (TEM) mode which has no lower cut-off frequency. Hollow metallic waveguides support transverse electric (TE) and transverse magnetic (TM) modes in which propagation is only possible above the cut-off frequency of the mode. These also exist as higher-order modes in coaxial lines. For design purposes the modes of propagation are represented by equivalent transmission lines whose properties can be calculated from the dimensions of the waveguide using lumped-element equivalent circuits. Simple methods are introduced for calculating the lumped susceptances of capacitive and inductive irises and height steps in rectangular waveguide. It is shown how discontinuities can be used for stub, Butterworth and Tchebychev matching in high-power waveguides. The design of transformers between waveguides and coaxial lines both with and without a change of mode and the design of vacuum windows for coaxial lines and rectangular waveguides, are discussed.

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Microwave and RF Vacuum Electronic Power Sources , pp. 41 - 92
Publisher: Cambridge University Press
Print publication year: 2018

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  • Waveguides
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.003
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  • Waveguides
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.003
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Waveguides
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.003
Available formats
×