Techniques to reduce the mutual coupling and to improve the isolation between antennas in a diversity system
Authors
Molina Martín, Fabián ; Pablos Abelairas, Javier
Term
10. term
Publication year
2010
Pages
72
Abstract
Kompakte mobiltelefoner anvender i stigende grad MIMO, men den korte afstand mellem antennerne skaber gensidig kobling, som kan forvrænge strålingsmønstre, ændre indgangsimpedans og øge signalkorrelation. Denne afhandling adresserer spørgsmålet om, hvordan isolation mellem antenner i håndsæt kan forbedres for at sikre effektiv diversitet/MIMO under stramme pladsbegrænsninger. Arbejdet undersøger tre udbredte antennetyper (ILA, IFA og PIFA) og vurderer to tilgange til at øge isolation: dielektriske vægge mellem antennerne og en jordplansændring (DGP). Studiet omfatter analyser i et simuleringsmiljø af enkelt- og dualantenne-systemer, herunder antenner til UMTS-bånd, opdeling i uplink/downlink og clamshell-formfaktorer, med fokus på krav som høj effektivitet, passende båndbredde og påvirkning fra brugerens nærhed. Den foreliggende tekst angiver ikke kvantitative resultater, men afhandlingen har til formål at identificere antenne- og layoutvalg, der reducerer gensidig kobling og forbedrer isolation i mobilhåndsæt.
Compact mobile devices increasingly rely on MIMO, but the short spacing between antennas causes mutual coupling that can distort radiation patterns, change input impedance, and raise signal correlation. This thesis investigates how to improve isolation between handset antennas to enable effective diversity/MIMO under tight size constraints. It examines three common handset antenna types (ILA, IFA, and PIFA) and evaluates two isolation-enhancement approaches: dielectric walls between antennas and a ground-plane modification technique (DGP). The work includes simulation-based analyses of single- and dual-antenna systems, covering antennas for UMTS bands, uplink/downlink roles, and clamshell layouts, with attention to practical requirements such as efficiency, bandwidth, and user proximity effects. The provided excerpt does not report quantitative findings, but the thesis aims to identify antenna and layout choices that reduce mutual coupling and increase isolation in mobile phone handsets.
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