Abstract
The superposition of plane waves, ray optics, and geometrical arguments are used to find the complete set of transverse magnetic (TM) and transverse electric (TE) modes in rectangular waveguide. These same methods are used to find the TEn0 modes in rectangular waveguide partially filled with a dielectric. This approach gives a clear physical picture of guided wave propagation. The partial differential wave equation, which perhaps tends to obscure the relations between plane waves, TE and TM modes, as well as group and phase velocities, need not be directly solved using this approach.
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