Properties of Sub-Wavelength Spherical Antennas With Arbitrarily Lossy Magnetodielectric Cores Approaching the Chu Lower Bound

Research output: Research - peer-reviewJournal article – Annual report year: 2014

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For a spherical antenna exciting any arbitrary spherical mode, we derive exact closed-form expressions for the dissipated power and stored energy inside (and outside) the lossy magneto-dielectric spherical core, as well as the radiated power, radiation efficiency, and thus the
radiation quality factor. These expressions are valid for the entire range from zero to infinite material loss tangents, with any dispersion of the
real parts and an inverse frequency variation of the imaginary parts of permittivity and permeability. For the dipole modes of a sub-wavelength
antenna, we demonstrate how an increasing magnetic loss tangent initially leads to a decreasing radiation quality factor, but in the limit of a perfect magnetic conductor (PMC) core the dissipated power tends to zero and the radiation quality factor reaches the fundamental Chu lower bound.
Original languageEnglish
JournalIEEE Transactions on Antennas and Propagation
Volume62
Issue number3
Pages (from-to)1456-1460
ISSN0018-926X
DOIs
StatePublished - 2014
CitationsWeb of Science® Times Cited: 5

    Research areas

  • Electrically small antennas, Energy storage, Magnetic losses, Quality factor, Spherical antennas
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