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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: 110K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
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.
作者: F. X. Qinl, C. Brosseau, H. X.Peng
上傳時間: 2013-06-25 11:55:16
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