Radiation by a Straight Thin-Wire Antenna Embedded in an Isotropic Chiral Medium

Akhlesh Lakhtakia, Vasundara V. Varadan, Vijay K. Varadan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Radiation characteristics of a straight thin-wire antenna embedded in an isotropic chiral medium {D = εE + βe∇ x E,B = µH + βµ∇× H) are explored here. Whereas the radiation field is linearly polarized for achiral media, here it contains both left-circularly polarized (LCP) and right-circularly polarized (RCP) components. The radiation pattern is found to be symmetric about the plane 0 = π/2, is azimuthally isotropic, and is TEM in nature; however, all three of these features are found as well for isotropic achiral media (β = 0). Some specific features of the radiation field on the constant spherical surfaces r = nπ(1 – k2β2)/2βk2 are also examined. If the antenna is reduced to a point dipole, it is shown that the radiation resistance is enhanced by the presence of chirality in the embedding medium, and the antenna LCP gain differs from the RCP gain.

Original languageEnglish (US)
Pages (from-to)84-87
Number of pages4
JournalIEEE Transactions on Electromagnetic Compatibility
Volume30
Issue number1
DOIs
StatePublished - Feb 1988

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antennas
wire
Wire
Antennas
Radiation
radiation distribution
radiation
isotropic media
radiation tolerance
chirality
embedding
Chirality
dipoles
transmission electron microscopy
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "Radiation characteristics of a straight thin-wire antenna embedded in an isotropic chiral medium {D = εE + βe∇ x E,B = µH + βµ∇× H) are explored here. Whereas the radiation field is linearly polarized for achiral media, here it contains both left-circularly polarized (LCP) and right-circularly polarized (RCP) components. The radiation pattern is found to be symmetric about the plane 0 = π/2, is azimuthally isotropic, and is TEM in nature; however, all three of these features are found as well for isotropic achiral media (β = 0). Some specific features of the radiation field on the constant spherical surfaces r = nπ(1 – k2β2)/2βk2 are also examined. If the antenna is reduced to a point dipole, it is shown that the radiation resistance is enhanced by the presence of chirality in the embedding medium, and the antenna LCP gain differs from the RCP gain.",
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Radiation by a Straight Thin-Wire Antenna Embedded in an Isotropic Chiral Medium. / Lakhtakia, Akhlesh; Varadan, Vasundara V.; Varadan, Vijay K.

In: IEEE Transactions on Electromagnetic Compatibility, Vol. 30, No. 1, 02.1988, p. 84-87.

Research output: Contribution to journalArticle

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AB - Radiation characteristics of a straight thin-wire antenna embedded in an isotropic chiral medium {D = εE + βe∇ x E,B = µH + βµ∇× H) are explored here. Whereas the radiation field is linearly polarized for achiral media, here it contains both left-circularly polarized (LCP) and right-circularly polarized (RCP) components. The radiation pattern is found to be symmetric about the plane 0 = π/2, is azimuthally isotropic, and is TEM in nature; however, all three of these features are found as well for isotropic achiral media (β = 0). Some specific features of the radiation field on the constant spherical surfaces r = nπ(1 – k2β2)/2βk2 are also examined. If the antenna is reduced to a point dipole, it is shown that the radiation resistance is enhanced by the presence of chirality in the embedding medium, and the antenna LCP gain differs from the RCP gain.

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