简介:Akindofdual-band-stopfilterwithanunsymmetricalT-shapedefectedgroundstructure(DGS)isproposed.Thefilterhastwobandgapcentersat4.9GHzand7.35GHz,respectively,wherethetwocentrefrequenciesarejustthesecondandthirdharmonics2.45GHz.Thefilterswithhighband-stopperformanceandwidebandspurioussuppressioncanbeachievedbycascadingminiaturizedunsymmetricalT-shapeDGS.Theattenuationofthree-cascadedT-shapeDGSfilteris30.77dBat4.9GHzand17.96dBat7.35GHzrespectively.Theaboveexperimentalresultsareingoodagreementwiththesimulationresults,especiallyforthethirdharmonic.
简介:UnlikethepreviousresearchworksanalyzingthestabilityoftheT-S(Takagi?Sugeno)fuzzymodel,anextensiononthestabilityconditionofT-Sfuzzysystemswithadifferentstrategyisprovided.Inthestrategyanewvariable,whichisrelativetothegradeoffuzzymembershipfunction,isintroducedtothestabilityanalysisandanewstabilityconclusionisdeduced.Thedefinitionofstabilityconditioninthispaperisdifferentfrompreviousworks,thoughtheyaresimilarinform.Withtheproposedmethod,thesimulationinflightcontrollawshowsabettereffectiveness.
简介:<正>2013年6月17日,增长速度最快的半导体公司SiTime公司(SiTimeCorporation)宣布,推出TempFlatTMMEMS。在TempFlat出现之前,所有MEMS振荡器都采用补偿电路来达到所需频率稳定度。而SiTime的TempFlatMEMS是一个革命性的突破,通过消除温度补偿需求,大幅度的促进了性能的提高,尺寸的缩小,功耗和成本的降低。YoleDeveloppement的策划经理和首席分析师LaurentRobin表示:"到2018年,预计MEMS振荡器市场将以60%的复合年增长率增长,达到4.67亿