Source excitation effects on power radiation from material and metamaterial resonances

Lotfollah Shafai*, Mou-Kehn Ng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The radiated power from a slotted spherical dipole antenna coated with dual layers of materials and metamaterials is determined. The excitation is assumed to be due to a constant applied voltage at the slot. It is shown that the radiated power is dependent on the coating parameters and, in particular, it can increase dramatically at the mode resonances. The problem is solved using a boundary value problem formulation, and determining the mode coefficients, using a matrix inversion. It is found that, at mode resonances the coefficient of the resonating mode becomes excessively large, and the radiation is due to the resonant mode alone. Using this finding, it is shown that the computed excessive radiated power is due to the assumed slot excitation, which can occur with any coating material when a particular mode becomes resonant.

Original languageEnglish
Title of host publicationProceedings - 2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Sciences Meeting, ANTEM/URSI 2009
DOIs
StatePublished - 16 Jun 2009
Event2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Sciences Meeting, ANTEM/URSI 2009 - Banff, AB, Canada
Duration: 15 Feb 200918 Feb 2009

Publication series

NameProceedings - 2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Sciences Meeting, ANTEM/URSI 2009

Conference

Conference2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Sciences Meeting, ANTEM/URSI 2009
CountryCanada
CityBanff, AB
Period15/02/0918/02/09

Keywords

  • Boundary value problem
  • Coated sphere
  • Material and metamaterial coatings
  • Matrix formulation
  • Mode resonances
  • Radiated power
  • Slotted sphere
  • Spherical dipole antenna

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