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Analysis of Energy Modes for MIMO Antennas

Ehrenborg, Casimir LU ; Gustafsson, Mats LU and Capek, Miloslav LU (2019) In TEAT
Abstract
The optimal spectral efficiency of MIMO antennas in an ideal line-of-sight channel is investigated when bandwidth requirements are placed on the channel. By posing the problem as a convex optimization problem restricted by the stored energy a semi-analytical expression is formed for its solution. It is shown that this solution is solely dependent on energy modes of the antenna. The ability to induce these modes by utilizing only a few sub-regions of the antenna is analyzed and compared to the full plate. The position of these regions is also investigated when they are raised above the ground plane. The performance of these cases is illustrated by calculating the optimal spectral efficiency of the unrestricted problem and plotting how much... (More)
The optimal spectral efficiency of MIMO antennas in an ideal line-of-sight channel is investigated when bandwidth requirements are placed on the channel. By posing the problem as a convex optimization problem restricted by the stored energy a semi-analytical expression is formed for its solution. It is shown that this solution is solely dependent on energy modes of the antenna. The ability to induce these modes by utilizing only a few sub-regions of the antenna is analyzed and compared to the full plate. The position of these regions is also investigated when they are raised above the ground plane. The performance of these cases is illustrated by calculating the optimal spectral efficiency of the unrestricted problem and plotting how much is lost when extra constraints are added. It is demonstrated that the spatial diversity of the controlled regions correlates with the number of significant energy modes. (Less)
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author
organization
publishing date
type
Book/Report
publication status
published
in
TEAT
issue
7266
pages
10 pages
publisher
Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden
language
English
LU publication?
yes
id
a6d67901-2542-45b9-b8f4-7545332b5f42
date added to LUP
2019-04-12 15:23:01
date last changed
2019-04-16 09:34:32
@techreport{a6d67901-2542-45b9-b8f4-7545332b5f42,
  abstract     = {The optimal spectral efficiency of MIMO antennas in an ideal line-of-sight channel is investigated when bandwidth requirements are placed on the channel. By posing the problem as a convex optimization problem restricted by the stored energy a semi-analytical expression is formed for its solution. It is shown that this solution is solely dependent on energy modes of the antenna. The ability to induce these modes by utilizing only a few sub-regions of the antenna is analyzed and compared to the full plate. The position of these regions is also investigated when they are raised above the ground plane. The performance of these cases is illustrated by calculating the optimal spectral efficiency of the unrestricted problem and plotting how much is lost when extra constraints are added. It is demonstrated that the spatial diversity of the controlled regions correlates with the number of significant energy modes.},
  author       = {Ehrenborg, Casimir and Gustafsson, Mats and Capek, Miloslav},
  institution  = {Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden},
  language     = {eng},
  month        = {04},
  number       = {7266},
  pages        = {10},
  series       = {TEAT},
  title        = {Analysis of Energy Modes for MIMO Antennas},
  year         = {2019},
}