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Equivalent Circuit Based Calculation of Signal Correlation in Lossy MIMO Antennas
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.ORCID-id: 0000-0002-3401-1125
2013 (engelsk)Inngår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 61, nr 10, s. 5214-5222Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Correlation coefficient of received signals across a pair of antennas is a key performance indicator for multiple-input-multiple-output (MIMO) systems. For multipath environments with uniform 3-D angular power spectrum, the signal correlation between two antennas can be exactly calculated from their 3-D radiation patterns. When radiation patterns are unavailable, a simplified approach that only requires the antennas' scattering parameters can be used instead. However, the simpler method assumes lossless antennas and thus only works well for antennas with high radiation efficiencies. To take into account the antenna loss, the idea of equivalent circuit approximation is used in this paper to analytically separate the lossy components (resistance or conductance) from the lossy antenna arrays, using known scattering parameters and radiation efficiencies. The simplified method using S parameters can then be applied to obtain the correlation coefficient of the equivalent lossless antennas. The effectiveness of the method has been verified on antennas operating at a single mode, such as dipole or patch at its lowest resonant frequency. Good results were also obtained for the measured case of a dual-antenna mobile terminal, consisting of a monopole and a PIFA.

sted, utgiver, år, opplag, sider
2013. Vol. 61, nr 10, s. 5214-5222
Emneord [en]
Antenna array, antenna correlation, antenna measurements, multiple-input-multiple-output (MIMO) systems, mutual coupling, scattering parameters
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-136508DOI: 10.1109/TAP.2013.2273212ISI: 000326831000034Scopus ID: 2-s2.0-84885633932OAI: oai:DiVA.org:kth-136508DiVA, id: diva2:677618
Forskningsfinansiär
Vinnova, 2009-04047Swedish Research Council, 2010-468
Merknad

QC 20131210

Tilgjengelig fra: 2013-12-10 Laget: 2013-12-05 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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