Transverse electric and magnetic waves are propagated along a hollow, right circular cylinder with inner radius R and conductivity a.
(a) Find the cutoff frequencies of the various ?c?? and TM modes. Determine numerically the lowest cutoff frequency (the dominant mode) in terms of the tube radius and the ratio of cutoff frequencies of the next four higher modes to that of the dominant mode. For this part assume that the conductivity of the cylinder is infinite.
(b) Calculate the attenuation constants of the waveguide as a function of frequency for the lowest two distinct modes and plot them as a function of frequency.