Integration of metamaterials in a mobile phone for reduction of the peak SAR in the head
Authors
Guesdon, Maxime ; Métivier-Mervaud, Edouard ; Sermouh, Adil
Term
10. term
Publication year
2009
Pages
86
Abstract
This thesis investigates whether integrating metamaterials—specifically split-ring resonators (SRRs)—into mobile phone antennas can reduce the peak specific absorption rate (SAR) in the head while improving antenna performance. It provides an accessible overview of metamaterials, their classification, fabrication, and applications, and applies finite-difference time-domain (FDTD) simulations across several configurations. A dipole antenna is evaluated with and without metamaterial loading using S11, gain, bandwidth, radiation efficiency, and SAR measured in a tissue-equivalent cube representing the human head. More realistic scenarios examine planar inverted-F antennas (PIFAs), keeping the overall antenna volume unchanged to match manufacturing standards, and analyze electric and magnetic fields in the region nearest the user. The study assesses the potential of SRRs to attenuate near fields and reduce peak SAR while maintaining or improving handset antenna performance, and discusses the relevance of metamaterials for mobile phone design. Quantitative outcomes are not reported in this excerpt.
Dette speciale undersøger, om integrering af metamaterialer – især split-ring resonatorer (SRR) – i mobiltelefonantenner kan reducere den maksimale specifikke absorptionsrate (SAR) i hovedet og samtidig forbedre antenneydelsen. Arbejdet giver en tilgængelig introduktion til metamaterialer, deres klassifikation, fremstilling og anvendelser, og benytter finite-difference time-domain (FDTD) simulationer af flere konfigurationer. En dipolantenne evalueres med og uden metamaterialer ud fra S11, gain, båndbredde, strålingseffektivitet og SAR målt i en vævskube, der repræsenterer et menneskeligt hoved. Mere realistiske scenarier undersøger planar inverted-F antenner (PIFA), hvor antennens samlede volumen ikke ændres i forhold til fremstillingsstandarder, og de elektriske og magnetiske felter analyseres i området nærmest brugeren. Studiet vurderer SRR’ers potentiale til at dæmpe nærfelter og reducere top-SAR, samtidig med at håndsættets antennepræstationer holdes eller forbedres, og diskuterer relevansen for mobiltelefondesign. Kvantitative resultater fremgår ikke af dette uddrag.
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