State-space models for stored energy and Q-factors
Gustafsson, Mats LU
(2016)
2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016
p.226-228
- Abstract
Q-factors are often used to quantify bandwidth performance of resonant structures. The Q-factor is defined as the quotient between the stored and dissipated energies. The time average dissipated energy is reformulated in the dissipated power and is well defined. The definition and evaluation of the stored energy is much more challenging and there are presently several proposals but none is applicable for general radiating system. The main challenge is to separate the radiated and stored parts of the total energy. In this paper, an alternative approach is proposed that is based on a state-space model of the antenna. The state-space model describes the internal states of the system and models the states that stores the energy. The... (More)
Q-factors are often used to quantify bandwidth performance of resonant structures. The Q-factor is defined as the quotient between the stored and dissipated energies. The time average dissipated energy is reformulated in the dissipated power and is well defined. The definition and evaluation of the stored energy is much more challenging and there are presently several proposals but none is applicable for general radiating system. The main challenge is to separate the radiated and stored parts of the total energy. In this paper, an alternative approach is proposed that is based on a state-space model of the antenna. The state-space model describes the internal states of the system and models the states that stores the energy. The state-space model is determined from the impedance matrix of the electric field integral equation. This provides a computationally efficient way to determine the stored energy that can be used in antenna current optimization. The state-space approach offers also new insight into the challenges to define the stored energy for electrically large objects.
(Less)
- author
- Gustafsson, Mats
LU
- organization
- publishing date
- 2016-09-19
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- 2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016
- article number
- 7571359
- pages
- 3 pages
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- conference name
- 2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016
- conference location
- Espoo, Finland
- conference dates
- 2016-08-14 - 2016-08-18
- external identifiers
-
- scopus:84992125315
- ISBN
- 9781509025022
- DOI
- 10.1109/URSI-EMTS.2016.7571359
- language
- English
- LU publication?
- yes
- id
- bafa1b8c-9d2a-4048-a8d3-e74b28356d8b
- date added to LUP
- 2016-11-16 14:48:52
- date last changed
- 2022-03-01 17:11:23
@inproceedings{bafa1b8c-9d2a-4048-a8d3-e74b28356d8b,
abstract = {{<p>Q-factors are often used to quantify bandwidth performance of resonant structures. The Q-factor is defined as the quotient between the stored and dissipated energies. The time average dissipated energy is reformulated in the dissipated power and is well defined. The definition and evaluation of the stored energy is much more challenging and there are presently several proposals but none is applicable for general radiating system. The main challenge is to separate the radiated and stored parts of the total energy. In this paper, an alternative approach is proposed that is based on a state-space model of the antenna. The state-space model describes the internal states of the system and models the states that stores the energy. The state-space model is determined from the impedance matrix of the electric field integral equation. This provides a computationally efficient way to determine the stored energy that can be used in antenna current optimization. The state-space approach offers also new insight into the challenges to define the stored energy for electrically large objects.</p>}},
author = {{Gustafsson, Mats}},
booktitle = {{2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016}},
isbn = {{9781509025022}},
language = {{eng}},
month = {{09}},
pages = {{226--228}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
title = {{State-space models for stored energy and Q-factors}},
url = {{http://dx.doi.org/10.1109/URSI-EMTS.2016.7571359}},
doi = {{10.1109/URSI-EMTS.2016.7571359}},
year = {{2016}},
}