On the bandwidth of a waveguide

The fundamental question of what waveguide run length can be used to carry a modulated carrier with a given modulation bandwidth down the guide without serious distortion is pragmatically answered by appealing to the known solution for the propagation of a pulsed carrier down the same waveguide. Universal-type curves of usable bandwidth (normalized to the carrier frequency) versus waveguide length (normalized to the free space wavelength at the carrier frequency) with the cutoff-to-carrier frequency as a parameter are given.