Trade-off Between Antenna Efficiency and Q-Factor
(2019) In IEEE Transactions on Antennas and Propagation 67(4). p.2482-2493- Abstract
The trade-off between radiation efficiency and antenna bandwidth, expressed in terms of Q-factor, for small antennas is formulated as a multi-objective optimization problem in current distributions of predefined support. Variants on the problem are constructed to demonstrate the consequences of requiring a self-resonant current as opposed to one tuned by an external reactance. The trade-offs are evaluated for sample problems and the resulting Pareto-optimal sets reveal the relative cost of valuing low radiation Q-factor over high efficiency, the cost in efficiency to require a self-resonant current, the effects of lossy parasitic loading, and other insights. Observations are drawn from the sample problems selected, though the tradeoff... (More)
The trade-off between radiation efficiency and antenna bandwidth, expressed in terms of Q-factor, for small antennas is formulated as a multi-objective optimization problem in current distributions of predefined support. Variants on the problem are constructed to demonstrate the consequences of requiring a self-resonant current as opposed to one tuned by an external reactance. The trade-offs are evaluated for sample problems and the resulting Pareto-optimal sets reveal the relative cost of valuing low radiation Q-factor over high efficiency, the cost in efficiency to require a self-resonant current, the effects of lossy parasitic loading, and other insights. Observations are drawn from the sample problems selected, though the tradeoff evaluation method is valid for studying arbitrary antenna geometries. In the examples considered here, we observe that small increases in Q-factor away from its lower bound allow for dramatic increases in efficiency toward its upper bound.
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- author
- Gustafsson, Mats LU ; Capek, Miloslav LU and Schab, Kurt LU
- organization
- publishing date
- 2019-01-08
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Antenna theory, Antennas, Bandwidth, Conductivity, Current distribution, current distribution, eigenvalues and eigenfunctions, Method of moments, Optimization, optimization methods, Q-factor, radiation efficiency
- in
- IEEE Transactions on Antennas and Propagation
- volume
- 67
- issue
- 4
- pages
- 2482 - 2493
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- scopus:85059804840
- ISSN
- 0018-926X
- DOI
- 10.1109/TAP.2019.2891448
- language
- English
- LU publication?
- yes
- id
- e0be02a6-b045-4541-af5a-e8ee90b96a71
- date added to LUP
- 2019-01-24 10:50:18
- date last changed
- 2022-04-25 20:22:56
@article{e0be02a6-b045-4541-af5a-e8ee90b96a71, abstract = {{<p>The trade-off between radiation efficiency and antenna bandwidth, expressed in terms of Q-factor, for small antennas is formulated as a multi-objective optimization problem in current distributions of predefined support. Variants on the problem are constructed to demonstrate the consequences of requiring a self-resonant current as opposed to one tuned by an external reactance. The trade-offs are evaluated for sample problems and the resulting Pareto-optimal sets reveal the relative cost of valuing low radiation Q-factor over high efficiency, the cost in efficiency to require a self-resonant current, the effects of lossy parasitic loading, and other insights. Observations are drawn from the sample problems selected, though the tradeoff evaluation method is valid for studying arbitrary antenna geometries. In the examples considered here, we observe that small increases in Q-factor away from its lower bound allow for dramatic increases in efficiency toward its upper bound.</p>}}, author = {{Gustafsson, Mats and Capek, Miloslav and Schab, Kurt}}, issn = {{0018-926X}}, keywords = {{Antenna theory; Antennas; Bandwidth; Conductivity; Current distribution; current distribution; eigenvalues and eigenfunctions; Method of moments; Optimization; optimization methods; Q-factor; radiation efficiency}}, language = {{eng}}, month = {{01}}, number = {{4}}, pages = {{2482--2493}}, publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}}, series = {{IEEE Transactions on Antennas and Propagation}}, title = {{Trade-off Between Antenna Efficiency and Q-Factor}}, url = {{http://dx.doi.org/10.1109/TAP.2019.2891448}}, doi = {{10.1109/TAP.2019.2891448}}, volume = {{67}}, year = {{2019}}, }