Upper cutoff frequency for rectangular waveguide

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SUMMARY

The upper cutoff frequency for a rectangular waveguide is a critical concept in microwave engineering, determined by the waveguide's dimensions. This frequency marks the transition point where the longitudinal component of the electromagnetic wave changes from imaginary to real, resulting in wave attenuation. The cutoff frequency is not solely dependent on the material of the waveguide but is fundamentally tied to its geometric properties. Understanding this phenomenon is essential for effective waveguide design and application.

PREREQUISITES
  • Understanding of electromagnetic wave propagation
  • Familiarity with microwave engineering principles
  • Knowledge of waveguide dimensions and their impact on frequency
  • Basic grasp of attenuation in wave propagation
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  • Research the mathematical derivation of cutoff frequencies in rectangular waveguides
  • Explore the impact of different materials on waveguide performance
  • Learn about the design considerations for microwave waveguides
  • Investigate the relationship between waveguide dimensions and operating frequencies
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Engineers and researchers in microwave engineering, RF system designers, and anyone involved in the design and analysis of waveguide systems will benefit from this discussion.

CPL.Luke
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So I know there is an upper cutoff frequency (at least in the microwave band) for a rectangular waveguide. However for the life of me I can't find why one would exist in the equations, the internet is full of references to it based off of the dimensions of the waveguide, but I'm curious whether or not the various calculators and tables are assuming a certain material is being used to construct the waveguide and thus they calculate the cutoff based on that, or if there is a real EM reaso as to why an upper cutoff exists.
 
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Well, roughly I think it's the point where the longitudinal component goes from being imaginary to real (passing through zero). When it goes real, the wave attenuates. Here's a good explanation: http://en.wikipedia.org/wiki/Cutoff_frequency
 

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