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Unformatted text preview: EEE 445 Homework #4 Solutions 3.4 Compute the TE 10 mode attenuation, in dB/m, for Kband waveguide operating at GHz 20 = f . The waveguide is made from brass, and is filled with a dielectric material having 2 . 2 = r ε and 002 . tan = δ . 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 π β ε π σ ( ) Np/m 0679 . 2 2 . 254 120 0555 . 2 2 Np/m 705 . 2 tan 2 3 2 3 2 = + = Ω = = Ω = = = = k a b k b a R f R k s c r s d π η β α ε π η σ μ π β δ α dB/m 72 . 6 Np/m 773 . = = + = d c α α α 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 belowcutoff 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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This note was uploaded on 12/14/2010 for the course EEE 445 taught by Professor Georgepan during the Fall '10 term at ASU.
 Fall '10
 GEORGEPAN

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