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A rectangular waveguide of internal dimensions (a = 4 cm and b = 3 cm) is to be operated in TE11 mode. The minimum operating frequency is

1. (A) 6.25 GHz
2. (B) 6.0 GHz
3. (C) 5.0 GHz
4. (D) 3.75 GHz

Correct answer: (A) 6.25 GHz

Solution

For TE11, fc=(c/2)*sqrt((1/a)^2+(1/b)^2) with a=0.04 m, b=0.03 m. This gives (1.5e8)*sqrt(625+1111.1)=1.5e8*41.67=6.25 GHz. The stored 3.75 GHz is wrong; the answer is 6.25 GHz.

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