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Specify wavelength inside rectangular waveguide

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ktx2222

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Hi all,

I have designed a rectangular waveguide. Frequency analysis is 1 GHz. The waveguide is filled by air and have the length is 3 times of wavelength in free space (900 mm). I simulated by HFSS and I got the E field likes the following photo:

RecWG.jpg

It seems that the waveguide's length is just 2 times of wavelength in free space? I was confused. Please explain to me. Thank a lot!
 

Each mode in a waveguide has a specific wavelength which is larger than the free space wavelength. Review the derivationtion in your favorite RF engineering text book.
 
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