EEE445_hw04sln

EEE445_hw04sln - EEE 445 Homework #4 Solutions 3.4 Compute...

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Unformatted text preview: EEE 445 Homework #4 Solutions 3.4 Compute the TE 10 mode attenuation, in dB/m, for K-band waveguide operating at GHz 20 = f . The waveguide is made from brass, and is filled with a dielectric material having 2 . 2 = r and 002 . tan = . Solution: 1- 2 2 1- 1 7- m . 548 m 7 . 621 m 2 . 419 2 S/m 10 2.564 cm 43 cm 07 . 1 = = = = = = = = = a k k k c f k . b a r ( ) Np/m 0679 . 2 2 . 254 120 0555 . 2 2 Np/m 705 . 2 tan 2 3 2 3 2 = + = = = = = = = k a b k b a R f R k s c r s d dB/m 72 . 6 Np/m 773 . = = + = d c 3.5 An attenuator can be made using a section of waveguide operating below cutoff, as shown below. If 286 . 2 = a cm and the operating frequency is 12 GHz, determine the required length of the below-cutoff section of waveguide to achieve an attenuation of 100 dB between the input and output guide. Ignore the effect of reflections at the step discontinuities....
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EEE445_hw04sln - EEE 445 Homework #4 Solutions 3.4 Compute...

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