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Ridge waveguide with TE01 mode

by dot4
Tags: mode, ridge, te01, waveguide
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Nov7-12, 04:12 PM
P: 2

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 !
Attached Thumbnails
h50v.JPG   fc.JPG  
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