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1、BANAntennaDesignUsingFerritePolymerComposite#######*T.Alves,R.Augustine,M.Grzeskowiak,B.Poussot,D.Delcroix,S.Protat,J-M.Laheurte,P.Quéffélec#LaboratoireESYCOM,UniversitéParis-EstMarne-La-ValléeBatimentCopernic5BdDescartes,Champs-sur-Marne77454MarneLaVa
2、lléeCédex2,Francetalves@univ-mlv.fr*LEST,UMRCNRS6165,CS93832UniversitédeBretagneOccidentale,BrestCedex393837-29238,FranceAbstract:WearableantennasareanintegralpartofBodyAreaWhenantennasareinthevicinityofthebody,theirNetworks(BAN).AntennadesignforBANapp
3、licationsisabehaviourisseriouslyaffected.Thisdrawbackresultsfromchallengingtasksincetheantennashavetobesmall,efficientandthehighpermittivityvaluesofskinandmuscle(near50at2.4mustnotbeaffectedbythewearer’sbody.ThismakesisolationGHz).Forelectricallysmalla
4、ntennas,thematchedbandwidthofantennaamatterofimportance.Ferritesformanopaqueisnarrow,usuallyfewpercentsoftheoperatingfrequency.mediaformicrowaveattheISMfrequenciesandhenceitcouldTherefore,theaerialisnolongermatchedwhenplacednearbeusedfortheisolationofa
5、ntennafromsurroundings.ThinpolymericferritesheetsareusedtoreducebodyinfluenceinbodywitharesonancefrequencyshifteddownwardsasshownBANperspective.infigure1(usuallymorethan20%,dependingontheantennatype).Ontheotherhand,biologicaltissueslossesyieldaI.INTROD
6、UCTIONbandwidthincreasewhichdoesnotcompensatefortheWearablecomputinghasbecomeafastgrowingfieldinresonanceshift.applicationorientedresearch.WirelessBodyAreaNetworks5(BAN)requirebodywornantennas,whichatmicrowavefrequenciescansufferfromreducedefficiency,r
7、adiation0patternfragmentationandvariationsinfeedpointimpedance.-5Inthispaper,stressismadetoreducetheinfluenceofhumanbodyonantennacharacteristics[1,2].Theantennasselected-10MeasuredSimulatedforthestudyaresmallandconformal.Theyaresensitiveto-15bothlinear
8、polarizationsandhaveminiaturizedgroundplane-20tosuitBANapplicationsat2.4GHz.Theseantennascouldbeeasilyintegratedandprintedonfabrictorealizewearable-25structures.Theaimofthispaperistocomparedifferenttypes-30ofantennasintheBANperspective.
