简介:在柔性LCP基板上制备RFMEMS开关,加工难度较大,影响开关质量的因素较多。主要研究影响LCP基RFMEMS开关加工质量的主要因素,寻找工艺过程控制解决方案。通过对关键工序的试验,对加工过程中的基板清洗、LCP基板覆铜面镀涂及整平、LCP基板无铜面溅射金属膜层、LCP基板平整度保持、二氧化硅膜层生长及图形化、牺牲层加工、薄膜微桥加工、牺牲层释放等工序进行了参数优化。研制的LCP基RFMEMS开关样件频率≤20GHz、插入损耗≤0.5dB,回波损耗≤-20dB,隔离度≥20dB,驱动电压30~50V。该加工方法对柔性基板上可动结构的制造具有一定的借鉴价值。
简介:A2-cmlongBragggratingwithreflectivityof~99.95%inB/Gecodopedopticalfiberwithouthydrogenloadingwascreatedbyphase-maskmethodwithapulsedKrFexcimerlaserat248nm.DCandACcomponentsofrefractiveindexchangewereanalyzedbymonitoringtransmissionspectrumevolutionduringthewritingprocessoffiberBragggrating.Therelationsoftheevolutionofcenterwavelengthandreflectivitywithnumberofpulseswererespectivelyinvestigated.
简介:文章以LTCC基P波段90°功分器的设计和制作为例,从无源设计仿真和LTCC工艺阐述了P波段功分器的研制过程。选用了承受功率大、尺寸相对较小的宽边耦合器结构。设计的宽边耦合器采用多层结构,有利于发挥LTCC基板多层、高集成度等优点。其电路物理模型为Broadside-coupledsymmetricstripline(BCL),采用的介质为LTCC,介电常数为5.9,每层介质厚度为0.1mm,导体采用Ag浆。在实物制作过程中,TOP层和Bottom层是采用灌银通孔实现的。最终测试结果与仿真结果吻合较好,在225MHz~400MHz频段内隔离23dB,插损0.5dB,驻波1.1,相平衡度±2.5,功率250W.
简介:随着广播式自动相关监视(ADS-B)技术的推广应用,作为ADS-B体系的组成部分的ADS-B地面站已经成为保障ADS-B使用效能的重要环节。在探讨ADS-B基本理论的基础上,对ADS-B地面站的架构、功能、规划与建设等方面进行了分析,并提出了相关设计方法和理念。
简介:Anautomaticdependentsurveillancebroadcast(ADS-B)systemhasserioussecurityproblems,andthedatacanbespoofedduringbroadcastingprecisepositioninformationofaircraft.AsolutionoftheADS-Bsystemdataauthenticationbasedontheellipticcurvecipher(ECC)andX.509certificateisproposed.ItcanavoidthekeydistributionproblembyusingthesymmetrickeyalgorithmandpreventtheADS-Bdatafrombeingspoofedthoroughly.ExperimentaltestresultsshowthatthesolutionisvalidandappropriateinADS-Buniversalaccesstransceiver(UAT)mode.
简介:Inthispaper,buildingtogrid(B2G)andvehicletogrid(V2G)havebeendefinedwithclearandpracticalunderstanding.Bothofthemarenewgenerationtechnologieswhicharetheessentialpartofsmartcitylivingandcrowdenergyclustering.Firstly,anin-detailedoverviewhasbeenprovidedwithanintroductiontoB2GandV2Gfollowedbyahistoricaloverviewandtheoreticalanalysisinrespecttosmartcityplanning.Next,areviewisconductedoncurrentandprevioussmartlivingresearch,whichdealswithB2GandV2G.EfficientB2GandV2Gimplementationsinpracticalcasesthenhavebeendiscussed.Lastly,bothofthesetechnicalprospectshavebeenanalyzedincrowdenergydiagram.