waveguide with dimensions of 0.9 in. (2.286 cm) by 0.4 in. (1.016 cm) is made
of copper (_ = 5.76 × 107 S/m) and it is filled with lossy polystyrene
(_ r = 2.56, tan _e = 4 × 10_4). Assume that the frequency of
operation is 6.15 GHz. Then determine the attenuation coefficient (in Np/m and
dB/m) that accounts for the finite conductivity of the walls and the dielectric
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