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

Fingerprint

Light propagation
Phase velocity
phase velocity
Electromagnetic waves
near fields
Waveguides
Vacuum
electromagnetism
Radiation
propagation
Communication
wireless communication
electromagnetic radiation
dipoles
broadband
waveguides
vacuum
radiation

Cite this

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title = "Aspects on the phase delay and phase velocity in the electromagnetic near-field",
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",
author = "Arto Hujanen and Johan Sten",
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Aspects on the phase delay and phase velocity in the electromagnetic near-field. / Hujanen, Arto; Sten, Johan.

In: Electromagnetic Waves, 2006, p. 67-80.

Research output: Contribution to journalArticleScientific

TY - JOUR

T1 - Aspects on the phase delay and phase velocity in the electromagnetic near-field

AU - Hujanen, Arto

AU - Sten, Johan

PY - 2006

Y1 - 2006

N2 - 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

AB - 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

U2 - 10.2528/PIER05051201

DO - 10.2528/PIER05051201

M3 - Article

SP - 67

EP - 80

JO - Electromagnetic Waves

JF - Electromagnetic Waves

SN - 1070-4698

ER -