Capacity Bounds and Degrees of Freedom for MIMO Antennas Constrained by Q-Factor

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F21%3A00349708" target="_blank" >RIV/68407700:21230/21:00349708 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1109/TAP.2021.3069432" target="_blank" >https://doi.org/10.1109/TAP.2021.3069432</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1109/TAP.2021.3069432" target="_blank" >10.1109/TAP.2021.3069432</a>

Result language
angličtina
Original language name
Capacity Bounds and Degrees of Freedom for MIMO Antennas Constrained by Q-Factor
Original language description
The optimal spectral efficiency and number of independent channels for MIMO antennas in isotropic multipath 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 the solution is solely dependent on the eigenvalues of the so-called energy modes of the antenna. The magnitude of these eigenvalues is analyzed for a linear dipole array as well as a plate with embedded antenna regions. The energy modes are also compared to the characteristic modes to validate characteristic modes as a design strategy for MIMO antennas. The antenna performance is illustrated through spectral efficiency over the Q-factor, a quantity that is connected to the capacity. It is proposed that the number of energy modes below a given Q-factor can be used to estimate the degrees of freedom for that Q-factor.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20202 - Communication engineering and systems

Project
<a href="/en/project/GA19-06049S" target="_blank" >GA19-06049S: Fundamental bounds on electromagnetic radiation and scattering phenomena and associated realizable subforms</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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