A class of artificial materials isorefractive with free space

A new class of dispersion-free artificial material that is isorefractive with free space is presented. Materials can be fabricated by composing an array of conducting inclusions in a tenuous host medium that are symmetric with respect to the direction of propagation. Strategies are proposed for both...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2003-05, Vol.51 (5), p.1093-1099
Main Author: Tyo, J.S.
Format: Article
Language:English
Subjects:
Antennas
Antennas and propagation
Aperture antennas
Arrays
Composing
Conducting materials
Dielectric constant
Dielectric materials
Electromagnetic propagation
Electromagnetic wave polarization
Impedance
Inclusions
Magnetic fields
Magnetic materials
Magnetic permeability
Mathematical analysis
Permeability
Propagation
Strategy
Sunspots
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Summary:A new class of dispersion-free artificial material that is isorefractive with free space is presented. Materials can be fabricated by composing an array of conducting inclusions in a tenuous host medium that are symmetric with respect to the direction of propagation. Strategies are proposed for both longitudinal and radial propagation. In the presence of the transverse electromagnetic mode, the inclusions are transversely polarized and hence raise the effective relative dielectric constant of the material. The inclusions simultaneously constrict the magnetic field lines, lowering the effective permeability by the same factor. The net effect is to make an artificial material with the same speed of propagation as the host material, but with a lower effective impedance. Such a material can be used to improve aperture efficiency in impulse radiating antennas. Limitations of the materials including field enhancement due to the inclusions and skin losses due to finite conductivities are also discussed.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2003.811495