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ECE 563 Microwave Engineering

ECE 563 Microwave Engineering. Microwave Cylindrical Resonators. Cylindrical Resonator. Fields of TE nm and TM nm bouncing back and forth between end plates. Again d= l  (rather than arbitrary values in waveguide) n=variations of the field components in the  direction

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ECE 563 Microwave Engineering

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  1. ECE 563 Microwave Engineering Microwave Cylindrical Resonators

  2. Cylindrical Resonator • Fields of TEnm and TMnmbouncing back and forth between end plates. • Again d=l (rather than arbitrary values in waveguide) • n=variations of the field components in the  direction • m=zeroes of the field in radial direction

  3. Cylindrical Resonator

  4. Cylindrical Resonator

  5. Rectangular Resonator Cavity Q

  6. Cylindrical Resonator Cavity Q

  7. Cylindrical Resonator Cavity Q

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

  9. 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

  10. Cavity Coupling

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

  12. Example: Cavity Perturbation Circular cylindrical cavity

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