Power carried in lowest mode. A rectangular waveguide is built such that b = 0.75a, with a = 10 mm.
(a) Find the lowest cutoff frequency and mode.
(b) Calculate the time averaged power the wave can propagate at a frequency 25% above the cutoff in (a), for a given electric field with amplitude E0 = 1000 V/m.
(c) Compare this with another waveguide for which b = 0.5a for the same conditions as in (b). Which waveguide can carry more power for the same field level?