漏泄同轴电缆通信_漏泄同轴电缆储存条件_高频同轴电缆

I I II T IIIIII I I 111[I I III— 摘要 漏泄同轴电缆具有良好的电波覆盖性能，用于井下通信，对矿山的安全生产起着至关重要的作用；用于国防通信，使通信具有隐蔽性好、不易被打击、抗干扰能力强、发射功率大等特点；用于地铁、、高速铁路的封闭区域可提高通信质量，减少交通事故，还可以为交通指挥调度提供强有力的通信技术保证。由此漏泄同轴电缆具有广泛的应用前景，为了更加深入了解漏泄同轴电缆的特性，进一步提高通信性能、扩展频率范围，有些关键技术便成为目前的研究热点。 本文首先从漏泄同轴电缆的基本理论出发，介绍了它的结构、分类、辐射模式和几个重要的电气性能指标一一使用频带、耦合损耗、传输损耗、谐振特性、特性阻抗、电容。然后根据计算电磁学的几种数值计算方法的比较，选择有限差分法进行计算。 在柱坐标系下，用三维有限差分法对漏泄同轴电缆的电容进行计算。文中首先由拉普拉斯方程导出封闭段和开槽段漏缆电位的差分方程，结合各分界面处的边界条件进行离散化，得到了电位的计算式，进而得到电容的计算式。然后讨论了该方法的计算精度对计算结果的影响，并与同规格漏缆实测值比较验证了该方法的有效性。最后研究了漏缆缝隙角度对电容值的影响情况。

关键词：漏泄同轴电缆有限差分计算电容 Abstract Abstract coaxialcablehasa ofwavescoveLWhenin Leaky goodability used an rolein in the ofthe used communication，itplaysimportant securitymine；When national hasfeaturesof defense，it concealment，not good easilybeing anti—interferencetransmissionandSOon．Whenusedintheclosed ability,great power of areametro，tunnel，and Can communication highspeedrailway,itimprove quality, reducetraffic also traffic with accident，andprovide controlpowerful technical catl that see coaxialcablehasa assurance．Hence，we leaky promising ordertoknowabout well its its prospect．In characteristics，improving its tothe ofwide performance，expandingfrequencyrange．Owingspecialtycoverage， CoaxialCable iS usedinmobilecommunicationinconfinedareassuchas Leaky widely and theresearchonits is mines，subways，tunnelsbuildings，and key a becominghotspotincreasingly． thebasic of Coaxial introducedits Beginning theoryLeaky Cable，thepaper andseveral indexes structure，classification importantperformance includingoperation resonance loss，transmission frequency—band，coupling loss，characteristic tothe ofseveral impedance，andcapacitance．According comparisonnumericalmethodsfor selectedthefinite ComputationalElectromagnetic，thepaperdifferencemethodforcalculation． The ofthe Coaxial slotis capacitanceLeaky Cable LCX with eight-shapedcalculatedThree-DimentionalFiniteDifferenceMethodinthis by paper．Thedifferentialofelectrical intheClosed andSlotted of equation potential segment segmenttheLCXisderivedfrom conditionsbetweeninteces Laplace boundary equation．Theandtheirdiscreteformsare for electrical and given．Theexpressions potential are ofthismethodis obtained．Then，thecapacitance accuracy withmeasuredvalueof LCX谢tIl iscomparing Specifications，theprocedurepresented influenceofslot onthe oftheLCXisvalidated．Finally,the angle capacitance yzed． coaxialcablefinitedifferencemethodKeyword：leaky capacitance 第一章绪论 第一章绪论 1．1漏泄同轴电缆简介 Coaxial 漏泄同轴电缆 Leaky 有传输、发射和接收信号能力的一种特殊的射频同轴电缆，专门用于漏泄 通信。

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