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High-frequency Electromagnetic Properties of Magnetic Polymer Composites for Microwave Applications  
High-frequency Electromagnetic Properties of Magnetic Polymer Composites for Microwave Applications
資料類型: PDF文件
關鍵詞: Multifunctional  composites  Ferromagnetic  microwires  Effective  permittivity  Frequency  
domain  spectroscopy  
資料大小: 78K
所屬學科: 通用高分子材料
來源: 來源網絡
簡介:
Ferromagneticmicrowiresandtheircompositesarehighlypromisingformicrowaveandmillimeter-waveapplicationscl].Inthesefrequencyranges,theconductivelossassociatedwiththeskineffectcanbemediatedbychoosingawireofpropergeometry.Whenitcomestothemicrowaveapplications,twoprincipaldirectionsshouldbeconsidered.Oneisthereconfigurabledevicesbasedonthemicrowires,e.g.,tunablemicrowirecomposites[2],wherebythemodulationofdielectricspectracanbecross-tunedbythemagneticfield.NotethatthismagneticfieldcouldbeeithersmallmagneticfieldrelyingonGMIeffectofmicrowiresorhighmagneticfieldrelyingontheferromagneticresonance(FMR)features.Forthecaseoflow-fieldtuning,itisnecessarytohaveproperskineffectcharacterizedbytheratioofskindepthtothewirediameter,whichshouldtakeanoptimizedvalueinordertomaximizethetunableeffect.Whileforthecaseofhigh-fieldtuning,theresistancecouldbehighorlow,whichwillyielddifferenttuningeffectsonthescatteringspectraC3].Melt-extractedmicrowiresusuallyhaveadiameterofabout40microns,yetwithfairlygoodtensilestrengthupt04GPa.Therelativelylargediametermakesitsuitableforthelow-fieldtunableoperations.WeexperimentallyshowthatthehighfieldeffectonthedispersionofeffectivepermittivityinamagneticpolymercompositeisdictatedbytheFMRfeaturesandmagnetocapcitativeeffect.Thescatteringcharacteristicsaredominatedbythereactanceofcompleximpedance.InthevicinityofFMRresonance,theskindepthreachesminimumandtheresistanceachievesmaximumandhencethepermittivity.Thisgenerallyleadstotheexpectationthatthemelt-extractedmicrowirescanoffertheparentpolymerbothexcellentmechanicalreinforcementeffectandbroad-rangemagneticfieldtunability.
上傳人: liu
上傳時間: 2013-06-25 11:55:16
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