Physical Bounds and Optimal Currents on Antennas
(2011) In Technical Report LUTEDX/(TEAT-7210)/1-22/(2011)- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2004199
- author
- Gustafsson, Mats LU ; Cismasu, Marius LU and Jonsson, Lars
- organization
- publishing date
- 2011
- type
- Book/Report
- publication status
- published
- subject
- in
- Technical Report LUTEDX/(TEAT-7210)/1-22/(2011)
- pages
- 22 pages
- publisher
- [Publisher information missing]
- report number
- TEAT-7210
- language
- English
- LU publication?
- yes
- additional info
- Published version: IEEE Transactions on Antennas and Propagatation, Vol. 60, No. 6, pp. 2672-2681, 2012
- id
- a05ebddf-fa14-49e8-b05b-abf427af2624 (old id 2004199)
- date added to LUP
- 2016-04-04 13:48:03
- date last changed
- 2018-11-21 21:16:22
@techreport{a05ebddf-fa14-49e8-b05b-abf427af2624, abstract = {{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.}}, author = {{Gustafsson, Mats and Cismasu, Marius and Jonsson, Lars}}, institution = {{[Publisher information missing]}}, language = {{eng}}, number = {{TEAT-7210}}, series = {{Technical Report LUTEDX/(TEAT-7210)/1-22/(2011)}}, title = {{Physical Bounds and Optimal Currents on Antennas}}, url = {{https://lup.lub.lu.se/search/files/6208015/2004200.pdf}}, year = {{2011}}, }