Minimum Q Electrically Small Antennas

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Minimum Q Electrically Small Antennas. / Kim, O. S.

In: I E E E Transactions on Antennas and Propagation, Vol. 60, No. 8, 2012, p. 3551-3558.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Kim, O. S. / Minimum Q Electrically Small Antennas.

In: I E E E Transactions on Antennas and Propagation, Vol. 60, No. 8, 2012, p. 3551-3558.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{759f6f921fca4565bb1ca6f63f3690e4,
title = "Minimum Q Electrically Small Antennas",
keywords = "Chu lower bound , Circular polarization, Electric dipole, Electrically small antennas , Fundamental limitations, Magnetic dipole, Quality factor",
publisher = "I E E E",
author = "Kim, {O. S.}",
year = "2012",
doi = "10.1109/TAP.2012.2201096",
volume = "60",
number = "8",
pages = "3551--3558",
journal = "I E E E Transactions on Antennas and Propagation",
issn = "0018-926X",

}

RIS

TY - JOUR

T1 - Minimum Q Electrically Small Antennas

A1 - Kim,O. S.

AU - Kim,O. S.

PB - I E E E

PY - 2012

Y1 - 2012

N2 - Theoretically, the minimum radiation quality factor Q of an isolated resonance can be achieved in a spherical electrically small antenna by combining TM1m and TE1m spherical modes, provided that the stored energy in the antenna spherical volume is totally suppressed. Using closed-form expressions for the stored energies obtained through the vector spherical wave theory, it is shown that a magnetic-coated metal core reduces the internal stored energy of both TM1m and TE1m modes simultaneously, so that a self-resonant antenna with the Q approaching the fundamental minimum is created. Numerical results for a multiarm spherical helix antenna confirm the theoretical predictions. For example, a 4-arm spherical helix antenna with a magnetic-coated perfectly electrically conducting core (ka=0.254) exhibits the Q of 0.66 times the Chu lower bound, or 1.25 times the minimum Q.

AB - Theoretically, the minimum radiation quality factor Q of an isolated resonance can be achieved in a spherical electrically small antenna by combining TM1m and TE1m spherical modes, provided that the stored energy in the antenna spherical volume is totally suppressed. Using closed-form expressions for the stored energies obtained through the vector spherical wave theory, it is shown that a magnetic-coated metal core reduces the internal stored energy of both TM1m and TE1m modes simultaneously, so that a self-resonant antenna with the Q approaching the fundamental minimum is created. Numerical results for a multiarm spherical helix antenna confirm the theoretical predictions. For example, a 4-arm spherical helix antenna with a magnetic-coated perfectly electrically conducting core (ka=0.254) exhibits the Q of 0.66 times the Chu lower bound, or 1.25 times the minimum Q.

KW - Chu lower bound

KW - Circular polarization

KW - Electric dipole

KW - Electrically small antennas

KW - Fundamental limitations

KW - Magnetic dipole

KW - Quality factor

U2 - 10.1109/TAP.2012.2201096

DO - 10.1109/TAP.2012.2201096

JO - I E E E Transactions on Antennas and Propagation

JF - I E E E Transactions on Antennas and Propagation

SN - 0018-926X

IS - 8

VL - 60

SP - 3551

EP - 3558

ER -