Resonance frequency of a magnetron cavity

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SUMMARY

The resonance frequency of a magnetron cavity is influenced by both its geometry and the applied magnetic field. The driven frequency is determined by the magnetic field strength, specifically 27.9924924 GHz per Tesla, with 875 Gauss yielding an output of 2.45 GHz. While the geometrical resonance frequency is based on the cavity's dimensions, the output frequency can deviate from this resonance due to off-resonance driving conditions.

PREREQUISITES
  • Understanding of magnetron operation principles
  • Knowledge of electromagnetic theory
  • Familiarity with frequency measurement in GHz
  • Basic concepts of magnetic fields and their effects on electronic components
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  • Research the relationship between magnetic field strength and frequency in magnetrons
  • Explore the design principles of magnetron cavities
  • Learn about off-resonance operation in microwave devices
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Electrical engineers, microwave engineers, and researchers involved in the design and application of magnetron technology.

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Is the resonance frequency of a magnetron cavity purely a function of its geometry?

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The output frequency of a magnetron is the driven frequency, which depends on the applied magnetic field, 27.9924924 GHz per Tesla. For example 875 Gauss corresponds to 2.45 GHz. The geometrical resonance frequency is based on dimensions of the cavity. Thus the output frequency is not necessarily the geometrical resonance frequency, because the cavity can be driven off-resonance.
 

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