Published online by Cambridge University Press: 05 June 2026
This chapter shows how using plane electromagnetic waves can simply give many of the results in previous chapters, without involving Maxwell’s equations. Starting with metallic rectangular and circular waveguides, these waves are used to find the main solutions for propagation and attenuation. After deriving the two Fresnel reflection coefficients for oblique incidence, plane waves reveal the solutions for slab guides directly. Following the analysis of oblique incidence on a conductor, solutions for the attenuation in some transmission lines are derived showing some of the physics of this phenomenon. There follows a section concerning plane waves going through thin resistive films. One of the examples shows the unusual result of a frequency independent solution for transmission through a resistive film on a dielectric substrate.
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