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Ridge waveguide with TE01 mode

  1. Nov 7, 2012 #1
    Hello,

    I don't know how to theoretically explain following behaviour of TE01 mode in a square ridged waveguide:

    When I select width of a ridge to be considerable compared to the size of a waveguide (e.g. 1/3, 1/2) and simultaneously I am increasing the height of a ridge (parameter v in a picture) the cutoff frequency is changing according to the attached picture.
    And that's a point where I get lost. I have no idea why this happens, why the cutoff frequency rises at first and then drops.
    Could anyone try and explain this?

    Thanks for any help !
     

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  2. jcsd
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