Aspects on the phase delay and phase velocity in the electromagnetic near-field

Arto Hujanen, Johan Sten

    Research output: Contribution to journalArticleScientific

    18 Citations (Scopus)

    Abstract

    The phase of a complex field and its speed of propagation are fundamental concepts of electromagnetic wave motion. Although it seems to be well-known that faster than light propagation of the phase may occur in, e.g., waveguides and certain dispersive media, it is often ignored that a similar phenomenon, in fact a very marked one, presents itself in the near-field of an arbitrary oscillating current in vacuum. Connected herewith is the observation that the phases of the transverse field components of a dipole approach kr-pi/2 and not kr, in the radiation zone. This article illustrates these phenomena by theoretical and numerical examples as well as indicates their consequences for broad-band wireless communication over short distances
    Original languageEnglish
    Pages (from-to)67-80
    JournalElectromagnetic Waves
    DOIs
    Publication statusPublished - 2006
    MoE publication typeB1 Article in a scientific magazine

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