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ECE 563 Microwave Engineering

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# ECE 563 Microwave Engineering - PowerPoint PPT Presentation

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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### ECE 563 Microwave Engineering

Microwave Cylindrical Resonators

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
Cavity Coupling
• Conducting probe in E field
• conducting loop with its plane normal to B field
• hole of iris between cavity and waveguide
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
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)
Example: Cavity Perturbation

Circular cylindrical cavity