State-space models and stored electromagnetic energy for antennas in dispersive and heterogeneous media
(2017) In Technical Report LUTEDX/(TEAT-7245)/1-21/(2017)- Abstract
- Accurate and efficient evaluation of the stored energy is essential for Q-factors, physical bounds, and antenna current optimization. Here, it is shown that the stored energy can be estimated from quadratic forms based on a state-space representation derived from the electric and magnetic field integral equations. The derived expressions are valid for small antennas embedded in temporally dispersive and inhomogeneous media. The quadratic forms also provide simple single frequency formulas for the corresponding Q-factors. Numerical examples comparing the different Q-factors are presented for dipole and meander line antennas in conductive, Debye, and Lorentz media for homogeneous and inhomogeneous media. The computed Q-factors are also... (More)
- Accurate and efficient evaluation of the stored energy is essential for Q-factors, physical bounds, and antenna current optimization. Here, it is shown that the stored energy can be estimated from quadratic forms based on a state-space representation derived from the electric and magnetic field integral equations. The derived expressions are valid for small antennas embedded in temporally dispersive and inhomogeneous media. The quadratic forms also provide simple single frequency formulas for the corresponding Q-factors. Numerical examples comparing the different Q-factors are presented for dipole and meander line antennas in conductive, Debye, and Lorentz media for homogeneous and inhomogeneous media. The computed Q-factors are also verified with the Q-factor obtained from the stored energy in Brune synthesized circuit models. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/ba1ac2a2-373f-45d5-a633-7b36aeace6da
- author
- Gustafsson, Mats
LU
and Ehrenborg, Casimir LU
- organization
- publishing date
- 2017-02-09
- type
- Book/Report
- publication status
- published
- subject
- in
- Technical Report LUTEDX/(TEAT-7245)/1-21/(2017)
- issue
- 7245
- pages
- 21 pages
- publisher
- Elektro- och informationsteknik
- project
- EIT_CACO-EMD Complex analysis and convex optimization for EM design
- language
- English
- LU publication?
- yes
- additional info
- Radio Science 52 (11), 1325-1343, 2017
- id
- ba1ac2a2-373f-45d5-a633-7b36aeace6da
- date added to LUP
- 2017-02-10 16:23:05
- date last changed
- 2021-08-07 04:05:13
@techreport{ba1ac2a2-373f-45d5-a633-7b36aeace6da, abstract = {{Accurate and efficient evaluation of the stored energy is essential for Q-factors, physical bounds, and antenna current optimization. Here, it is shown that the stored energy can be estimated from quadratic forms based on a state-space representation derived from the electric and magnetic field integral equations. The derived expressions are valid for small antennas embedded in temporally dispersive and inhomogeneous media. The quadratic forms also provide simple single frequency formulas for the corresponding Q-factors. Numerical examples comparing the different Q-factors are presented for dipole and meander line antennas in conductive, Debye, and Lorentz media for homogeneous and inhomogeneous media. The computed Q-factors are also verified with the Q-factor obtained from the stored energy in Brune synthesized circuit models.}}, author = {{Gustafsson, Mats and Ehrenborg, Casimir}}, institution = {{Elektro- och informationsteknik}}, language = {{eng}}, month = {{02}}, number = {{7245}}, series = {{Technical Report LUTEDX/(TEAT-7245)/1-21/(2017)}}, title = {{State-space models and stored electromagnetic energy for antennas in dispersive and heterogeneous media}}, url = {{https://lup.lub.lu.se/search/files/22584321/TEAT_7245.pdf}}, year = {{2017}}, }