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A rectangular waveguide is 5 cm x 2.5 cm. Calculate cutoff freq. of dominant mode.
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The dominant mode of a rectangular waveguide is the TE1,0 mode, with m=1 & n=0

Fc = 1.5108(ma)2+(nb)2

Fc = 1.5108(10.050)2+(00.025)2

Fc = 3 GHz

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