简介：Inthispaperthemodelling,analysisandoptimizationofmillimeterwaveoscillatorsareinvestigatedbyusingtheafrequency-domainharmonicbalancetechnique(FDHB),wheretheexternal-circuitimpedanceslookingoutsidefromtheactivedevicearecalculatedwithacombinedtechniqueofmodesexpansion,Galerkin,andcollocationmethods.Theoptimizationresultsareinagreementwiththeexperimentalones,whichshowthereliabilityofthepresentedmodelandoptimization.

简介：Theplasmageneratedinthelow-altitudeatmosphereisofhighcollisionfrequencies.Inthispaper,thetransmissioncoefficientsofmillimeter(MM)wavesnormallyincidentupontheplasmawithhighcollisionfrequenciesarecalculatedandanalyzed.Theexperimentalresultsofreflectionandattenuationarepresentedfortheeight-millimeterwavespropagatingthroughtheplasma.BoththecalculatedexperimentalresultsindicatethattheMM-wavesconcernedareattenuatedsignificantlyandreflectedweakly,whenpropagatingthroughtheplasmaofhighcollisionfrequencies.

简介：　　Thebonecompositewasproducedbybiomimeticsynthesis.Itshowssomefeaturesofnaturalboneinbothcompositionandmicrostructure.Andthecollagenmolecularsandthenano-crystalhydroxyapatiteassembleintoultrastructuresimilartonaturalbone.Itpossessesporousstructurewithporosityfrom100μmto500μmaftermixedwithPLA(polylacticacid).　　……

简介：Thephaseandfrequencylockingofmicrowave,millimeterwavepowercombiningwereanalysedandsummarizedinanall-roundway.Themaster/slavephaselockingofcavityoscillators,thepeerphaselockingofmutuallycoupledoscillators,andthepeerphaselockingofring-connectedmultipleoscillatorswereinvestigated.Theresultsofnumericalcalculations,andtherelationsofphasetophaselockingmodelandoscillatorparametersweregiven.Andthecavityandspacepowercombiningaspectsformicrowaveandmillimeterwavewerepresented.

简介：毫米波浪radio-over-fiber技术为在毫米波浪信号的无线通讯system.Optical产生是的下一代提供无线宽带服务表明潜力毫米波浪的光产生的一些方法的优点和缺点表明的毫米波浪radio-over-fibersystem.The的最重要的技术之一是discussed.Then光毫米波浪信号传播性能described.Finally，毫米的概述

简介：Icewatercontent(IWC)playsimportantrolesinweatherandclimatechange.DeterminingtheIWCsofcirruscloudswithmillimeter-wavelengthradarcanbeproblematicduetoinfluencesoficeparticlerotationontheirbackscatteringcrosssections.Wehereintroducemodelstodescribetheradiationpatternsofsixnonsphericalparticlesofspecificsizes.SimulationsusingHFSSsoftwarewereappliedtodescribethedifferencesresultingfromdifferentorientationsandequivalentspheres.Adoubleexponentialfunctionwasusedforfittingtodescribetherelationshipbetweentheparticles’maximumsizesandbackscatteringcrosssections.Thebackscatteringcrosssectionsofnonsphericaliceparticleswerecomputedbythemethodofmoment,andthoseoftheequivalentsphericalparticleswerecomputedbyLorenz-Mietheoryforthreedifferentorientations:fixed,horizontal,andrandom.AssumingthatamixtureofnonsphericaliceparticlesfollowstheB-Hmixingmodel,thesizedistributionofcirrusparticlesobeystheexponentialdistributionmeasuredbyNASAin2007.BycomputingtheIWCsofcirrusclouds,whichfollowstheabovementionedB-Hmodelandexponentialdistribution,theradarreflectivityfactorsofnonsphericaliceparticlesandequivalentspheresatthreedifferentorientationscanbecomputed.Subsequently,theIWCresultscanbeacquiredbyinputtingtheradarreflectivityvariablesintothewell-knownIWC-Zformula.TheanalysisdescribedheredemonstratesthatwhenusingtheradarreflectivityZ,theorientationmustbeconsideredinordertodeterminetheIWC.Usingequivalentspheretheory,thederivedIWCsunderestimatetheactualIWCs.Theseresultsareimportantforaccuratelyretrievingthemicrophysicalparametersofcirrusclouds.

简介：在这份报纸，一个新毫米波浪(公里波浪)波长部门multiplexing(WDM)系统基于radio-over-fiber(ROF)，技术被建议。在这条途径，多波长光来源被supercontinuum(SC)获得技术，和公里波浪信号被使用光外差获得方法。我们试验性地为6-WDM隧道表明光搬运人的产生，由采用光heterodyne技术获得40个GHz公里波浪信号，并且成功地完成在在在G.652纤维的25km的距离上的WDM隧道的2.5Gbit/s的低误差率传动。试验性的结果证实建议答案可行、合算。

简介：Rolesofrareearthoxide(RE2O3)additivesinmillimeter-wave(MM)sinteringofAlNwereinvestigatedfromthestandpointsofphasediagram,heatingcharacteristicsofrareearthoxides,andmorphologyofintergranularoxidephase.Inthemillimeter-wavesinteringofAlN,densificationtemperaturedecreasedwiththedecreaseoftheionicradiusofrareearthionandwascloselyrelatedwiththeeutectictemperatureintheRE2O3-Al2O3binarysystem.Thelowestdensificationtemperatureinthemillimeter-wavesinteringofAlNwithYb2O3additivewasattributedtothelargestheatingrateofYb2O3·Al2O3binaryoxideundermillimeter-waveradiation.Furthermore,thelowestdensificationtemperaturecouldbeattainedwhileselectingtheYb2O3contentsoastoformtheintergranularphasewiththeeutecticcompositionintheYb2O3-Al2O3binarysystem.TheresultshowedgoodagreementwiththeabovementionedduringthesinteringofSi3N4withYb2O3-Al2O3additive.FromTEMobservation,itwasverifiedthatfilm-likeintergranularoxidephaseformedundermillimeter-waveradiationwasfavorableforattaininghighthermalconductivityintheYb2O3addedAlNs.

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简介：Theanglecompensationmethodisadoptedtodetectsloshingwavesbylaserdiffraction,inthecasethatthewavelengthofthesloshingwavesismuchgreaterthanthatoftheincidentlight.Thecleardiffractionpatternisobservedtobeofasymmetry,involvingorders,positionandintervalofthediffractionspotsthatarediscoveredduringthelightgrazingincidence.Itisfoundthatthelargertheangleofincidenceis,themoreobvioustheasymmetryis.Thehigherthenegativediffractionordersare,thesmallertheintervalsbetweenspotsare.Onthecontrary,inthepositiveregion,thehigherthediffractionordersare,thelargerthespotintervalsare.Thepositiveintervalislargerthanthatofthesamenegativediffractionorder.Iftheincidentanglereaches1.558radintheexperiment,allpositivediffractionorderscompletelyvanish.BasedonthemechanismofphasemodulationandwiththeFouriertransformmethod,therelationsbetweentheincidentangleandposition,intervalspaces,andordersofdiffractionspotsarederivedtheoretically.Thetheoreticalcalculationsarecomparedwiththeexperimentaldata,andthecomparisonshowsthatthetheoreticalcalculationsareingoodagreementwiththeexperimentalmeasurement.

简介：Anewmethodisproposedtogeneratemicrowaveandmillimeter-wavebyusingpolarizationscramblerandpolarizationmaintainingfiber(PMF),whichisbasedonthecouplingandtheinteractionbetweenthetwopolarizationsoftheinitialnon-chirpGaussianopticalpulseinPMF.Theexpressionsofthemicrowaveandmillimeter-wavearederivedbycouple-modetheory.Moreover,thefeasibilityisanalyzedsimulatedly.Atlast,0-120GHzmicrowaveandmillimeter-wavecanbeproducedbyadjustingsystemparameterorinputpulseduration.Theprojectisofgreatsimplicity,stabilityandhighexportefficiency.

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简介：Numericallyanalyzedisthetransmissionperformanceoftheopticalmillimeter(mm)-wavegeneratedbyfrequencyup-conversionviaaphasemodulatoralongthedispersivefiber.60GHzmm-wavesub-carrier(SC)signalscanbeobtainedafterfibertransmission,simultaneously,thephase-modulatedsignalscanbeconvertedtotheintensity-modulatedones.Thenumericalresultsshowthattheopticalmm-waveatfadingloopshasbetterperformance,andtheeyediagramstillkeepsopenwhenopticalmm-wavesignalistransmittedover98km.

简介：Millimeterandterahertzwavephotodetectorshaveawiderangeofapplications.However,thestate-of-the-arttechniqueslagfarbehindtheurgentdemandduetothestructureandperformancelimitations.Here,wereportsensitiveanddirectmillimeterandterahertzwavephotodetectionincompactInGaAs-basedsubwavelengthohmicmetal–semiconductor–metalstructures.Thephotoresponseoriginatesfromunidirectionaltransportationofnonequilibriumelectronsinducedbysurfaceplasmonpolaritonsunderirradiation.ThedetectedquantumenergiesofelectromagneticwavesarefarbelowthebandgapofInGaAs,offering,tothebestofourknowledge,anoveldirectphotoelectricconversionpathwayforInGaAsbeyonditsbandgaplimit.Theachievedroomtemperaturerisetimeandnoiseequivalentpowerofthedetectorare45μsand20pW·Hz^-1∕2,respectively,atthe0.0375THz(8mm)wave.Thedetectedwavelengthistunablebymountingdifferentcouplingantennas.Roomtemperatureterahertzimagingofmacroscopicsamplesataround0.166THzisalsodemonstrated.Thisworkopensanavenueforsensitiveandlarge-areauncooledmillimeterandterahertzfocalplanararrays.

简介：Two-dimensionalmetallicphotoniccrystalslabswithsquarelatticeareproposedtobeusedforthedesignofwaveguidebandpassfiltersoperatinginmillimetertoterahertzregion.Filtercharacteristicsarestudiedwhenrodradiiandlatticeconstantsarechanged.Basedonthefrequencyscalingtechnique,aseriesofhigherfrequencyfiltershasbeendesigned.Byusinglaserdrillingandweldingprocessingtechniques,acompactwaveguidefilterembeddedinanEIA-WR10waveguidewithcentralfrequency145.5GHzand3-dBbandwidthof5.26GHzisfabricatedandmeasured.Themeasurementdataagreewellwiththesimulationprediction.

简介：Thispaperdesignsa3mmradiometerandvalidatewithexperimentsbasedontheprincipleofpassivemillimeterwave(PMMW)imaging.Thepoorspatialresolution,whichislimitedbyantennasize,shouldbeimprovedbypostdataprocessing.Aconjugate-gradient(CG)algorithmisadoptedtocircumventthisdrawback.Simulationandrealdatacollectedinlaboratoryenvironmentaregiven,andtheresultsshowthattheCGalgorithmimprovesthespatialresolutionandconvergentrate.Further,itcanreducetheringingeffectswhicharecausedbyregularizingtheimagerestoration.Thus,theCGalgorithmiseasilyimplementedforPMMWimaging.

简介：同时由使用一个单个双电极的Mach-Zehnder调节的人(MZM)产生并且播送第三封产生电信(3G)和毫米波浪(MMW)信号的一个新奇radio-over-fiber(ROF)计划被建议。没有明显的非线性，ROF系统导致。由采用这种模拟ROF信号传播技术，高度透明的纤维无线的集中网络能被认识到，它为多标准是理想的无线系统操作。