For a parallel-plate waveguide,
a) find the frequency (in terms of the cutoff frequency fc) at which the attenuation constant due to conductor losses for the TM„ mode is a minimum,
b) obtain the formula for this minimum attenuation constant,
c) calculate this minimum αc for the TM1 mode if the parallel plates are made of copper and spaced 5 (cm) apart in air.
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