Fundamental bounds on MIMO antennas
(2018) In IEEE Antennas and Wireless Propagation Letters 17(1). p.21-24- Abstract
Antenna current optimization is often used to analyze the optimal performance of antennas. Antenna performance can be quantified in <i>e.g.</i>, minimum Q-factor and radiation efficiency. The performance of MIMO antennas is more involved and, in general, a single parameter is not sufficient to quantify it. Here, the capacity of an idealized channel is used as the main performance quantity. An optimization problem in the current distribution for optimal capacity, measured in spectral efficiency, given a fixed Q-factor and radiation efficiency is formulated as a semi-definite optimization problem. A model order reduction based on characteristic and energy modes is employed to improve the computational... (More)
Antenna current optimization is often used to analyze the optimal performance of antennas. Antenna performance can be quantified in <i>e.g.</i>, minimum Q-factor and radiation efficiency. The performance of MIMO antennas is more involved and, in general, a single parameter is not sufficient to quantify it. Here, the capacity of an idealized channel is used as the main performance quantity. An optimization problem in the current distribution for optimal capacity, measured in spectral efficiency, given a fixed Q-factor and radiation efficiency is formulated as a semi-definite optimization problem. A model order reduction based on characteristic and energy modes is employed to improve the computational efficiency. The performance bound is illustrated by solving the optimization problem numerically for rectangular plates and spherical shells.
(Less)
- author
- Ehrenborg, Casimir LU and Gustafsson, Mats LU
- organization
- publishing date
- 2018-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Convex optimization, MIMO, Physical bounds, Q-factor, Semidefinite programming
- in
- IEEE Antennas and Wireless Propagation Letters
- volume
- 17
- issue
- 1
- pages
- 21 - 24
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- scopus:85034224913
- ISSN
- 1536-1225
- DOI
- 10.1109/LAWP.2017.2772032
- language
- English
- LU publication?
- yes
- id
- a437c53a-f01f-41b0-a1d0-93cf4f091cd2
- date added to LUP
- 2017-12-08 09:37:52
- date last changed
- 2022-03-24 22:47:35
@article{a437c53a-f01f-41b0-a1d0-93cf4f091cd2, abstract = {{<p>Antenna current optimization is often used to analyze the optimal performance of antennas. Antenna performance can be quantified in &lt;i&#x003E;e.g.&lt;/i&#x003E;, minimum Q-factor and radiation efficiency. The performance of MIMO antennas is more involved and, in general, a single parameter is not sufficient to quantify it. Here, the capacity of an idealized channel is used as the main performance quantity. An optimization problem in the current distribution for optimal capacity, measured in spectral efficiency, given a fixed Q-factor and radiation efficiency is formulated as a semi-definite optimization problem. A model order reduction based on characteristic and energy modes is employed to improve the computational efficiency. The performance bound is illustrated by solving the optimization problem numerically for rectangular plates and spherical shells.</p>}}, author = {{Ehrenborg, Casimir and Gustafsson, Mats}}, issn = {{1536-1225}}, keywords = {{Convex optimization; MIMO; Physical bounds; Q-factor; Semidefinite programming}}, language = {{eng}}, number = {{1}}, pages = {{21--24}}, publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}}, series = {{IEEE Antennas and Wireless Propagation Letters}}, title = {{Fundamental bounds on MIMO antennas}}, url = {{http://dx.doi.org/10.1109/LAWP.2017.2772032}}, doi = {{10.1109/LAWP.2017.2772032}}, volume = {{17}}, year = {{2018}}, }