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Physical bounds and radiation modes for MIMO antennas

Ehrenborg, Casimir LU and Gustafsson, Mats LU (2018)
Abstract
Modern antenna design for communication systems revolves around two extremes: devices, where only a small region is dedicated to antenna design, and base stations, where design space is not shared with other components. Both imply different restrictions on what performance is realizable. In this paper properties of both ends of the spectrum in terms of MIMO performance is investigated. For small antennas the size restriction dominates the performance parameters. The regions dedicated to antenna design induce currents on the rest of the device. Here a method for studying fundamental bound on spectral efficiency of such configurations is presented. For larger structures the number of degrees of freedom available per unit area is investigated... (More)
Modern antenna design for communication systems revolves around two extremes: devices, where only a small region is dedicated to antenna design, and base stations, where design space is not shared with other components. Both imply different restrictions on what performance is realizable. In this paper properties of both ends of the spectrum in terms of MIMO performance is investigated. For small antennas the size restriction dominates the performance parameters. The regions dedicated to antenna design induce currents on the rest of the device. Here a method for studying fundamental bound on spectral efficiency of such configurations is presented. For larger structures the number of degrees of freedom available per unit area is investigated for different shapes. Both of these are achieved by formulating a convex optimization problem for maximum spectral efficiency in the current density on the antenna. A closed form solution for this problem is formulated and investigated in relation to constraining parameters, such as size and efficiency.
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author
organization
publishing date
type
Book/Report
publication status
published
subject
pages
20 pages
publisher
Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden
language
English
LU publication?
yes
id
8c85bb09-2faf-4f5f-8f43-bb537413f766
date added to LUP
2018-12-31 16:02:27
date last changed
2019-01-14 08:20:43
@techreport{8c85bb09-2faf-4f5f-8f43-bb537413f766,
  abstract     = {Modern antenna design for communication systems revolves around two extremes: devices, where only a small region is dedicated to antenna design, and base stations, where design space is not shared with other components. Both imply different restrictions on what performance is realizable. In this paper properties of both ends of the spectrum in terms of MIMO performance is investigated. For small antennas the size restriction dominates the performance parameters. The regions dedicated to antenna design induce currents on the rest of the device. Here a method for studying fundamental bound on spectral efficiency of such configurations is presented. For larger structures the number of degrees of freedom available per unit area is investigated for different shapes. Both of these are achieved by formulating a convex optimization problem for maximum spectral efficiency in the current density on the antenna. A closed form solution for this problem is formulated and investigated in relation to constraining parameters, such as size and efficiency.<br/>},
  author       = {Ehrenborg, Casimir and Gustafsson, Mats},
  institution  = {Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden},
  language     = {eng},
  pages        = {20},
  title        = {Physical bounds and radiation modes for MIMO antennas},
  year         = {2018},
}