The term space wave refers to a wave that is propagating through an open medium with a diverging wavefront as it moves away from the source. The term guided wave denotes a variety of wave configurations that are being carried by a closed/open/partially open structure [1]. A guided wave may also be known as a bounded wave, which is a term inspired by its propagation mechanism, where a traveling wave is bounded by two dissimilar mediums with different electromagnetic (EM) characteristics; the wave propagates along the interface and decays exponentially to the surrounding mediums.
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Araghi et al. (2021) studied this question.
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