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4 - Slow-Wave Structures

Published online by Cambridge University Press:  27 April 2018

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

Cavity resonators form an essential part of the r.f. structure in many vacuum tubes. A resonator provides a strong r.f. electric field which can interact with a stream of electrons. The basic theory of resonators and coupled resonators is reviewed using a lumped element model and the description of a resonator in terms of its frequency, shunt impedance and R/Q is explained. The effects of external loading are considered together with the excitation of a resonator by an external source. At microwave frequencies cavity resonators are used in place of lumped-element circuits. The calculation of the properties of circular and rectangular cavities is described including the effects of surface roughness on the shunt impedance. Re-entrant cavities are important in microwave tubes because they provide a strong r.f. electric field in a short interaction gap. Their properties can be calculated approximately using an equivalent circuit and, with high precision, using the method of moments. An external transmission line can be coupled to a cavity resonator using either loop or iris coupling. The calculation of the properties of both methods of coupling, including large irises, is described. The methods of measuring the properties of cavity resonators are discussed.
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Microwave and RF Vacuum Electronic Power Sources , pp. 134 - 189
Publisher: Cambridge University Press
Print publication year: 2018

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  • Slow-Wave Structures
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.004
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  • Slow-Wave Structures
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.004
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  • Slow-Wave Structures
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.004
Available formats
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