GATE EC 2000 Electromagnetics Solution Q 5

GATE EC 2000 Electromagnetics Solution Q 5

A rectangular waveguide has dimensions 1\;cm\times0.5\;cm. Its cut-off frequency is __.

a) 5 GHz

b) 10 GHz

c)15 GHz

d) 12 GHz

Ans- c)

Explanation

Consider the lowest possible dominant mode TE10

\lambda_c=2a=2\times1\;cm=2\times10^{-2}m f_c=\frac c{\lambda_c}=\frac{3\times10^8}{2\times10^{-2}}=15\;GHz

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