ECE 563 Microwave Engineering

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ECE 563 Microwave Engineering

• Microwave Cylindrical Resonators

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Cylindrical Resonator

• Fields of TEnm and TMnmbouncing back and forth
  between end plates.
• Again ?dl? (rather than arbitrary values in
  waveguide)
• nvariations of the field components in the ?
  direction
• mzeroes of the field in radial direction

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Cylindrical Resonator
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Cylindrical Resonator
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Rectangular Resonator Cavity Q
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Cylindrical Resonator Cavity Q
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Cylindrical Resonator Cavity Q
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Cavity Coupling

• Conducting probe in E field
• conducting loop with its plane normal to B field
• hole of iris between cavity and waveguide

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Cavity Coupling

• Hole or iris between cavity and waveguide
• Introduction of pulsating electron beam through a
  gap in a resonator, in direction of E field

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Cavity Coupling
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Cavity Perturbations

• At resonance, WeWm
• Perturbation causes one type of energy to change
  more than the other, then f0 shifts to restore
  WeWm
• If small volume of a cavity is taken out of the
  region of max E (where H is negligible)

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Example Cavity Perturbation

• Circular cylindrical cavity