NDLI: Lower Bounds on Q for Finite Size Antennas of Arbitrary Shape

Content Provider	IEEE Xplore Digital Library
Author	Kim, O.S.
Copyright Year	1963
Abstract	The problem of the lower bound on the radiation Q for an arbitrarily shaped finite size antenna of nonzero volume is formulated in terms of equivalent electric and magnetic currents densities distributed on a closed surface coinciding with antenna exterior surface. When these equivalent currents radiate in free space, the magnetic current augments the electric current, so that the fields interior to the surface vanish. In contrast to approaches based solely on electric currents, the proposed technique ensures no stored energy interior to the antenna exterior surface, and thus, allows the fundamental lower bound on Q to be determined. To facilitate the computation of the bound, new expressions for the stored energy, radiated power, and Q of coupled electric and magnetic source currents in free space are derived.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	146
Ending Page	154
Page Count	9
File Size	938917
File Format	PDF
ISSN	0018926X
Volume Number	64
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape Energy storage Magnetic resonance Current Current density Dipole antennas stored energy Electrically small antennas frequency bandwidth magnetic currents physical bounds Poynting’s theorem quality factor Q factor radiation reactive energy quality factor (Q)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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