通信英语Lesson9TransmiisionL.ppt

Lesson 9 Transmission Lines,通信与电子信息专业英语教程陈杰美、刘洪盛、饶渐升电子工业出版社,10/19/2023,2,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Lesson 9 Transmission Lines,BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques,10/19/2023,3,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Backgrounds,Terminologyconductor noise interference load resistance,inductance,capacitance,and conductanceBalun electrostatic stray capacitancedielectric&permittivity Reflectometry,10/19/2023,4,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,conductor,One who conducts,especially:指挥者，尤指：One who is in charge of a railroad train,bus,or streetcar.车长：火车，汽车或电车的管理员One who directs an orchestra or other such group.【音乐】指挥家：指挥交响乐队或类似团体的人A substance or medium that conducts heat,light,sound,or especially an electric charge.【物理学】导体：传导热、光、声或特别是电荷的物质或介质A lightning rod,as on a house or barn.避雷针，如房子或仓库上面的,10/19/2023,5,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,noise interference,噪声干扰杂波干扰,10/19/2023,6,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,load,n.负荷,重担,装载量,工作量,负载,加载was loaded with worries.vt.装载,装填,使担负loaded the table with food.loading grain onto a train.vi.装货,装弹药，装料To transfer(data)from a storage device into a computers memory.download（下载）upload（上载）,10/19/2023,7,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,resistance,inductance,capacitance and conductance,Resistance 电阻抗Inductance 电感抗Capacitance 电容抗Conducatance 电导,10/19/2023,8,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Balun,不平衡变压器，也称作巴伦,10/19/2023,9,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,electrostatic,adj.静电的,静电学的,10/19/2023,10,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,stray capacitance,寄生电容杂散电容,10/19/2023,11,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Dielectric&permittivity,Dielectric n.电介质,绝缘体adj.非传导性的Permittivityn.介电常数,电容率,10/19/2023,12,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Reflectometry,n.反射计,10/19/2023,13,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Lesson 9 Transmission Lines,BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques,10/19/2023,14,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Text tour,Outline Types of Transmission LinesTransmission-line Wave Propagation Time-domain Reflectometry,10/19/2023,15,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Types of Transmission Lines,be classified as Transmission lines can be generally classified as balanced or unbalanced.With an unbalanced transmission line,one wire is at ground potential,whereas the other wire is at signal potential.平衡式传输线的一条导线接地，而另一条则与信号电位相同。,10/19/2023,16,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Types of Transmission Lines,If this is the case,the ground wire must go wherever any of the signal wires go.在这种情况下，有信号导线的地方就必须有地线.,10/19/2023,17,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Types of Transmission Lines,The primary constants of twisted-pair cable are its electrical parameters(resistance,inductance,capacitance,and conductance),which are subject to variations with the physical environment such as temperature,moisture,and mechanical stress and depend on manufacturing deviations电参数（阻抗、感抗、容抗和电导率）是双绞线的主要参数，这些参数将受物理环境变化（如温度、湿度、机械压力）的影响，同时也取决于制造工艺的偏差。,10/19/2023,18,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Transmission-line Wave Propagation,However,in metallic transmission lines where the conductor is generally copper and the dielectric materials vary considerably with cable type,an electromagnetic wave travel much more slowly.然而，在金属传输线中，传输导体通常是铜线，随电缆不同，绝缘介质材料通常也不同，因此，电磁波的传播速率会比空气中的传播速率要低得多。,10/19/2023,19,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Transmission-line Wave Propagation,Velocity factor(sometimes called velocity constant)is defined simply as the ratio of the actual velocity of propagation through a given medium to the velocity of propagation through free space.我们定义在某种给定的传输媒介中的实际传播速率与自由空间中的传播速率的比值为速率因子.,10/19/2023,20,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Transmission-line Wave Propagation,However,the dielectric constant of materials commonly used in transmission lines ranges from 1.2 to 2.8,giving velocity factors from 0.6 to 0.9.然而在传输线中使用材料的介电常数通常在1.2到2.8之间，所以速率因子一般从0.6到0.9。,10/19/2023,21,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Transmission-line Wave Propagation,Therefore,inductance,capacitance,and velocity of propagation are mathematically related by the formula 所以下面给出了电感量、电容量和传播速率之间的数学关系,10/19/2023,22,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Time-domain Reflectometry,Metallic cables,as with all components within an electronic communications system,can develop problems that inhibit their ability to perform as expected.各种金属电缆都有可能产生问题，这就使得电缆无法达到预期的性能。,10/19/2023,23,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Time-domain Reflectometry,Cable problems are often attributed to chemical erosion at cross-connect points and mechanical failure.电缆出问题通常是由于金属交接点发生化学腐蚀或者机械故障引起的。,10/19/2023,24,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Lesson 9 Transmission Lines,BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques,10/19/2023,25,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Language in use,Vocabulary cancellation,longitudinal,reference,shield,winding,parallel,deviations,concentric,cost effective,impedance,echo StructureReading/writing techniques,10/19/2023,26,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,Vocabulary,10/19/2023,27,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,cancellation,n.取消，撤销Cancellation amplifier 补偿放大器Cancellation network 补偿电路Cancellation of intensities 振动强度的抵消Echo cancellation 回波消除Envelope cancellation 包络补偿Harmonic cancellation 谐波消除,10/19/2023,28,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,longitudinal,adj.经度的,纵向的a longitudinal reckoning by the navigator;made longitudinal measurements of the hull.领航员进行经度计算；计算船身长度longitudinal stripes.纵向的条纹a longitudinal study of twins.对双胞胎的跟踪研究,10/19/2023,29,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,reference,n.提及,涉及,参考,参考书目,证明书(人)with reference to;in reference to.关于；就而言reference frame 参考帧Reference system 参考系统,10/19/2023,30,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,shield,n.防护物,护罩,盾,盾状物【电】屏蔽Electrostatic shield 静电屏蔽Magnetic shield 磁屏（蔽）Shield cable 屏蔽电缆Shield grid 屏蔽栅（极),10/19/2023,31,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,winding,n.绕,缠,绕组,线圈an armature with its wire winding.绕有金属线的电枢Ampere winding 安（培）匝（数）Bias winding 偏压线圈,10/19/2023,32,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,parallel,adj.平行的,相同的,类似的,并联的n.平行线,平行面,类似,相似物v.相应,平行【电】并联的【计】并行的，同时输送的Parallel data transmission 并行数据传输,10/19/2023,33,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,deviation,n.背离“Vice was a deviation from our nature”(Henry Fielding)“不道德行为就是背离我们生活常轨的行为”(亨利菲尔丁)离差：差别Deviation absorption 偏移吸收Deviation from mean 均值离差 Frequency deviation 频率偏移Mean square deviation 均方差,10/19/2023,34,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,concentric,adj.同中心的concentric circles 同心圆Be concentric with 与同心（轴）的,10/19/2023,35,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,cost effective,经济有效的cost effectiveness 成本效率,10/19/2023,36,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,impedance,n.电阻抗,全电阻,物阻抗,10/19/2023,37,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,echo,n.回声,回音,回波vi.发回声,随声附和vt.摹仿,重复,反射计 禁止(或允许)在屏幕上显示批处理命令行Echoed signal 反射信号,10/19/2023,38,通信与电子信息专业英语教程 陈杰美、刘洪盛、饶渐升,echo,a fashion that is an echo of an earlier style.仿效早期时尚的流行风潮found echoes of past civilizations while examining artifacts in the Middle East.在调查中东的史前古器物时，发现了旧时文明的遗迹Their demand for justice found an echo in communities across the nation.他们对正义的要求在全国各社区内引起了共鸣Her resignation had echoes throughout the department.她的辞职影响了整个部门rooms echoing with laughter.房间里充满了笑声,Structure,Reading/Writing Techniques,The end of lesson 9,Thanks!,