通信英语Lesson9TransmiisionL.ppt
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1、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 interferenc
2、e 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 dire
3、cts 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
4、,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,inducta
5、nce,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
6、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 t
7、echniques,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
8、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 wire
9、s 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 temperatu
10、re,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
11、 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)
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