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Given a waveguide with non-perfectly conducting parallel metal plates spaced 3 cm apart and filled with...

Given a waveguide with non-perfectly conducting parallel metal plates spaced 3 cm apart and filled with air. Shows that for the TM1 mode, the attenuation is minimal when the operating frequency is equal to square(3)fc where fc is the cutoff frequency of the mode.

I know that we have to do a différential, but I'm not sure how.

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