共查询到18条相似文献,搜索用时 109 毫秒
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用多极理论分析圆柱—正N边形内导体同轴传输线 总被引:6,自引:0,他引:6
本文提出用多极理论准解析计算方法分析圆柱- 正N 形内导体同轴传输线,介绍了多极理论的准解析计算规则。实例计算结果表明:用多极理论准解析计算方法分析圆柱- 正N 边形内导体同轴传输线,其计算精度是相当高的,多极理论准解析计算方法是一种较好的传输线分析方法,可以很方便地应用于传输线工程问题的设计与计算 相似文献
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用多极理论分析圆柱内导体屏蔽矩形板线的阻抗问题 总被引:4,自引:1,他引:3
本文给出用多极理论计算具有圆柱形内导体的各种电(磁)壁屏蔽矩形板线的特性阻抗.通过数学分析,给出其相应的计算公式。通过对多种屏蔽矩形板线的实际计算结果表明:多极理论具有极高的计算精度,是一种非常有效的屏蔽矩形线计算方法,可以很方便地用于屏蔽矩形板线工程问题的设计与计算。 相似文献
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微带多电容负载阻抗匹配模型和计算 总被引:2,自引:0,他引:2
分析了多抽头微带取样传输线的波形失真问题,根据分布参数理论和微波传输线理论,提出基于集中参数原则的等效分布电容模型和基于分布参数理论的局部补偿模型,推导出阻抗匹配计算公式和计算方法,数值模拟和电路仿真结果表明,将两种方法联合应用进行补偿,可大大降低输出波形的失真程度。 相似文献
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任意负载有损传输线时域的精细积分法 总被引:1,自引:0,他引:1
精细积分法能够有效地对有损传输线时域响应进行分析。通过对精细积分法进行改进,使其不仅能够在时域内很容易地处理具有电抗性质的负载,还可容易地处理如短路、开路这类传统FFT法难以解决的特殊的传输线时域响应问题,极大地提高了精细积分法分析传输线时域响应的功效。 相似文献
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电磁拓扑分析方法将一个复杂系统的求解问题等效成许多子系统问题的求解,能够有效降低复杂电子系统电磁干扰问题求解的难度。本文针对双层屏蔽腔内辐射源对传输线电磁干扰求解问题,提出了一种计算腔内电偶极子辐射源对传输线负载电磁耦合的电磁拓扑分析方法。阐述了双层屏蔽腔内传输线耦合机理,建立了腔内传输线负载电磁干扰的电磁拓扑图和信号流图。根据腔体本征模理论、Bethe 理论以及BLT 方程,得到了传输线负载干扰电压。结果表明本文方法能够准确计算腔内干扰源对传输线负载干扰,且计算效率高,占用内存少。 相似文献
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A new transmission scheme for channels with intersymbol interference named "matched-transmission (MT) technique" is proposed. An implementation of the MT system is presented and its relations with conventional techniques are described. It is shown that the partial response scheme is a special case of our new technique. The performance of the MT technique is discussed from the view point of the output signal-to-noise ratio and the system is shown to attain asymptotically the bound performance predicted by the information theory. 相似文献
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MT90826芯片是MITEL公司生产的大容量数字交换器件,单片可实现4096×4096通道的无阻塞交换,可编程建立在每一个通道基础上、附带不同通过延时的时隙交换,利用该器件的组合可构成更大容量的交换网络或交叉连接矩阵。该器件可有效解决传统交换机采用多个存储器及控制集成电路所构成的交换网络系统存在的生产成本高、调试困难、稳定性差等问题。文章介绍了MT90826芯片的内部结构、原理及时序关系,并给出了控制软件设计,其编程思路可拓展到MITEL公司同系列的其他数字交换芯片。 相似文献
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Karols P. Dostert K. Griepentrog G. Huettinger S. 《Selected Areas in Communications, IEEE Journal on》2006,24(7):1339-1350
The rapid progress of power line communications (PLC) for data transmission over electric power supply systems is now opening ways for special applications such as train automation in local transportation and mass transit (MT) systems. These DC-powered traction networks can be used as communication links between wayside equipment and the moving trains. As MT networks significantly differ from usual electricity supply systems, the usage of existing models and communication equipment for conventional PLC channels turns out infeasible. Therefore, the work reported in this paper focuses on MT channel investigation and modeling, in order to develop novel adapted solutions. The outcome is a stochastic MT channel model, which-besides multipath and time-variance-also includes peculiar properties such as the behavior of ring structures and the impact of the Doppler effect invoked by moving trains. In addition, a very special interference scenario is treated, caused by the rectifiers in these DC-powered environments. Besides a complete simulation model, this paper presents detailed guidelines for building emulation hardware, so that channel adapted PLC system design for MT networks can now be successfully started without further expensive field trials. 相似文献
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Weikai Su Wei Hong ZhengHau Zhu YunYi Wang 《Journal of Infrared, Millimeter and Terahertz Waves》1992,13(12):1925-1941
In this paper, the scattering parameters of a waveguide cross junction loaded with a metallic post in the center are analyzed for the first time by using the Method of Lines. The homogeneous boundary condition of the third kind and curved boundary are introduced in the formulation. Numerical results are in good agreement with the experimental data. The scattering parameters at Ka-band and W-band of the cross junctions loaded with metallic posts of different radii are presented. It is shown from the numerical results that loaded with metallic posts is an effective means for adjusting the network parameters of the waveguide cross junction to satisfy some special requirements in the design of millimeter wave components. 相似文献