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Physical Bounds and Optimal Currents on Antennas

Författare:
Publiceringsår: 2011
Språk: Engelska
Sidor: 22
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7210)/1-22/(2011)
Dokumenttyp: Rapport
Övrig information: Published version: IEEE Transactions on Antennas and Propagatation, Vol. 60, No. 6, pp. 2672-2681, 2012

Sammanfattning

Physical bounds on the directivity Q-factor quotient and optimal current distributions are determined for antennas of arbitrary shape and size using an optimization formulation. A variational approach offers closed form solutions for small antennas expressed in the polarizability of the antenna structure. Finite sized antennas are solved using Lagrangian parameters in a method of moments formulation. It is also shown that the considered stored electric energy can be negative for electrically large objects. This effect is mitigated by a Helmholtz decomposition of the current density. Moreover, it is shown that the optimal charge density for a small antenna can be generated by several current densities. Numerical examples for small and large antennas are used to illustrate the results.

Disputation

Nyckelord

  • Technology and Engineering

Övrigt

Published
TEAT-7210
  • Electromagnetic theory

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