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Abstract
Usually, electromagnetic evanescent waves are some kinds of near fields. However, it looks as if the evanescent waves inside a cut-off waveguide had nothing to do with any near field. In this paper, we will show that the evanescent waves inside a cut-off waveguide can also be regarded as the near fields of an aerial array.
Highlights
From the point of view of classical field theory, an evanescent wave is a standing wave with an intensity that exhibits exponential decay with distance from the boundary at which the wave was formed
Electromagnetic evanescent waves are some kinds of near fields
It looks as if the evanescent waves inside a cut-off waveguide had nothing to do with any near field
Summary
From the point of view of classical field theory, an evanescent wave is a standing wave with an intensity that exhibits exponential decay with distance from the boundary at which the wave was formed. Evanescent wave coupling is a process by which electromagnetic waves are transmitted from one medium to another by means of the evanescent, exponentially decaying electromagnetic field. The process is the same as that of quantum tunneling, except with electromagnetic waves instead of quantum-mechanical wavefunctions. Electromagnetic evanescent waves are some kinds of near fields (e.g., the ones in total internal reflection). It looks as if the evanescent waves inside a cut-off waveguide had nothing to do with any near field. By means of another way of looking at the guided waves, we will show that the evanescent fields inside a cut-off waveguide can be regarded as the near fields of an aerial array
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