Question: A 4-cm-square waveguide is filled with a dielectric with complex permittivity c = 16 o (l j10 4 ) and is excited with

A 4-cm-square waveguide is filled with a dielectric with complex permittivity ε_c = 16ε_o (l – j10^–4) and is excited with the TM₂₁ mode. If the waveguide operates at 10% above the cutoff frequency, calculate attenuation ad. How far can the wave travel down the guide before its magnitude is reduced by 20%?

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