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Progress In Electromagnetics Research
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ASPECTS ON THE PHASE DELAY AND PHASE VELOCITY IN THE ELECTROMAGNETIC NEAR-FIELD

By J. C.-E. Sten and A. Hujanen

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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 - π/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.

Citation: (See works that cites this article)
J. C.-E. Sten and A. Hujanen, "Aspects on the Phase Delay and Phase Velocity in the Electromagnetic Near-Field," Progress In Electromagnetics Research, Vol. 56, 67-80, 2006.
doi:10.2528/PIER05051201
http://www.jpier.org/PIER/pier.php?paper=0505121

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