Published online by Cambridge University Press: 05 June 2026
This chapter includes those waveguides which cannot be described with just an equivalent circuit. This involves using Maxwell’s equations and the electromagnetic wave equation to give the solutions for both metallic and dielectric waveguides. Starting with rectangular metallic waveguide, the various modes, cut-off frequencies and frequency-dependent propagations are analysed. This is followed by a similar discussion of circular metallic waveguides. Both slab guides and rectangular dielectric waveguides are then covered, followed by an analysis of optical fibers. In all these guides, the lowest-order modes and the mono-mode bandwidth are identified. The chapter also includes discussions of the higher-order modes present in coaxial cable, microstrip, coplanar waveguide, and stripline and their effect on the bandwidth.
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