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Bandwidth-Constrained Capacity Bounds on MIMO Antennas

Ehrenborg, Casimir LU orcid ; Gustafsson, Mats LU orcid and Capek, Miloslav LU (2019) In TEAT
Abstract
The optimal spectral efficiency of MIMO antennas in Rayleigh and ideal channels are investigated when bandwidth requirements are placed on the antenna. By posing the problem as a convex optimization problem restricted by the port Q-factor a semi-analytical expression is formed for its solution. The antennas are simulated by method of moments and the solution is formulated both for structures fed by discrete ports, as well as for design regions characterized by an equivalent current. It is shown that this solution is solely dependent on the so-called energy modes of the antenna.
These modes are compared to the characteristic modes and how to effectively excite them is investigated for a linear dipole array as well as a plate with... (More)
The optimal spectral efficiency of MIMO antennas in Rayleigh and ideal channels are investigated when bandwidth requirements are placed on the antenna. By posing the problem as a convex optimization problem restricted by the port Q-factor a semi-analytical expression is formed for its solution. The antennas are simulated by method of moments and the solution is formulated both for structures fed by discrete ports, as well as for design regions characterized by an equivalent current. It is shown that this solution is solely dependent on the so-called energy modes of the antenna.
These modes are compared to the characteristic modes and how to effectively excite them is investigated for a linear dipole array as well as a plate with embedded, and raised, antenna regions.
The performance is illustrated through spectral efficiency over the Q-factor, a quantity that is connected to the true capacity. It is demonstrated that the Q-factor and the spectral efficiency form a Pareto trade-off bound, and that a certain Q-factor is Pareto optimal. (Less)
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author
; and
organization
publishing date
type
Book/Report
publication status
published
subject
in
TEAT
issue
7266
pages
26 pages
publisher
Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden
project
Optimal antenna synthesis
EIT_CACO-EMD Complex analysis and convex optimization for EM design
language
English
LU publication?
yes
id
a6d67901-2542-45b9-b8f4-7545332b5f42
date added to LUP
2019-04-12 15:23:01
date last changed
2025-04-04 15:21:39
@techreport{a6d67901-2542-45b9-b8f4-7545332b5f42,
  abstract     = {{The optimal spectral efficiency of MIMO antennas in Rayleigh and ideal channels are investigated when bandwidth requirements are placed on the antenna. By posing the problem as a convex optimization problem restricted by the port Q-factor a semi-analytical expression is formed for its solution. The antennas are simulated by method of moments and the solution is formulated both for structures fed by discrete ports, as well as for design regions characterized by an equivalent current. It is shown that this solution is solely dependent on the so-called energy modes of the antenna.<br/>These modes are compared to the characteristic modes and how to effectively excite them is investigated for a linear dipole array as well as a plate with embedded, and raised, antenna regions. <br/>The performance is illustrated through spectral efficiency over the Q-factor, a quantity that is connected to the true capacity. It is demonstrated that the Q-factor and the spectral efficiency form a Pareto trade-off bound, and that a certain Q-factor is Pareto optimal.}},
  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}},
  series       = {{TEAT}},
  title        = {{Bandwidth-Constrained Capacity Bounds on MIMO Antennas}},
  url          = {{https://lup.lub.lu.se/search/files/80866021/TEAT_7266.pdf}},
  year         = {{2019}},
}