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基于精细积分法的耦合传输线瞬态分析 总被引:3,自引:0,他引:3
在耦合传输线的瞬态分析中提出了一种基于精细积分法的龙格-库塔迭代法。这是一种时域内的数值解法,该方法在对电报方程进行空间离散而获得对时间的一阶微分方程之后,没有采用精细计算法,而是采用了龙格-库塔迭代法。避免了大量的矩阵运算,提高了传输线瞬态响应分析的效率。 相似文献
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Yongle Wu Yuanan Liu Shulan Li Jingchang Nan 《Journal of Infrared, Millimeter and Terahertz Waves》2008,29(12):1146-1155
The rigorous analytical solutions and the ABCD matrix of the lossy Cosine-Squared tapered nonuniform transmission lines (CSTNTL) are presented in this paper. According to different boundary conditions, the unique solution is obtained mathematically. Through the numerical calculations based on analytical solutions, the distributed voltages and currents in different terminated cases are shown to explain the transmission characteristics of CSTNTL. Especially in the lossy case the distributed power values are simulated to show the attenuation phenomenon. 相似文献
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《Microwave Theory and Techniques》1983,31(6):457-462
Equivalent transformations, which were recently derived for mixed lumped and distributed circuits, may be extended to circuits consisting of lumped reactance, resistors, and Iossy transmission lines. It is shown that circuits consisting of a cascade connection of lumped element sections and Iossy uniform transmission lines are equivalent to circuits consisting of a cascade connection of lossy nonuniform transmission lines, lumped elements, and ideal transformers. Furthermore, by considering the limiting case of these transformations, equivalent transformations for circuits consisting of a cascade connection of lumped reactance, resistors, and nonuniform transmission lines are obtained. Exact equivalent circuits of Iossy even-order binomial form transmission lines are derived from these equivalent transformations. 相似文献
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传输线理论是射频与微波电路的重要基础理论,而其中ABCD参量特别适用于分析级联网络的传输性能.本文针对非均匀有耗传输线的ABCD参量求解问题,建立传输线的数学模型,给出了三种解法,即级联法、微分方程法和积分方程法,并对三种方法的准确性和效率进行了讨论. 相似文献
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This paper describes a new algorithm for the analysis of multiconductor transmission lines characterized by frequency-dependent per-unit-length parameters. The proposed model is based on studying telegrapher's equations as a Sturm-Liouville problem. The open-end impedance matrix is expressed in a series form as an infinite sum of matrices of rational functions, derived from the series form of the dyadic Green's function. The rational form of the open-end impedance matrix allows an easy identification of poles and residues and, thus, the development of a reduced-order system of the interconnect. The pole-residue representation can be synthesized in an equivalent circuit or converted into a state-space model, which can be easily embedded into conventional nonlinear circuit SPICE-like solvers. The numerical results confirm the validity of the proposed modeling technique. 相似文献
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通过龙格-库塔(Runge-Kutta)方法迭代求出非均匀传输线的广义ABCD矩阵,再解常微分方程求得整个系统的拉氏城响应,最后利用数字拉氏逆变换(NILT)获得电路的时域响应,从而使得传统的NILT法得以分析非均匀传输线,实例表明其具有较高的效率和精度。 相似文献
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《Circuits and Systems II: Express Briefs, IEEE Transactions on》2009,56(2):157-161
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本文在考虑传输线损耗的情况下,对时域有限差分(FDTD)法应用于不等长有损耗传输线的情况进行了研究。首先,在考虑传输线损耗的情况下给出了传输线上各点电压和电流的迭代计算公式;其次,利用该公式对不等长有损耗传输线模型进行数值计算和理论分析;最后,通过仿真实验,其结果表明了所提计算方法是正确和有效的。该方法对不等长有损耗传输线的研究提供了理论计算参考。 相似文献
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Yongle Wu Yuanan Liu Shulan Li 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(8):781-791
The rigorous analytical solutions of the lossy Hermite nonuniform transmission lines (HNTL) are presented in this paper. These
solutions are based on two special functions, namely, Hermite function and confluent hypergeometric function. The ABCD matrix
of HNTL is given to obtain the corresponding frequency characteristic of the HNTL transformer. Through numerical simulations
in different terminated cases, it is found that the lossless HNTL can be matched by resistance loads. This conclusion is different
from the lossless one presented by D.torrungrueng. etc. In addition, the distributed power values of HNTL in the lossy case are calculated to show the attenuation character. 相似文献
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《Microwave Theory and Techniques》1969,17(10):746-752
The transmission-line equations describing propagation along coupled transmission lines are cast in coupled-mode form so that the roles of the different coupling coefficients and the impedance variation are more directly observable. Restrictions on the various parameters for obtaining directional coupling with nonuniform lines are then discussed and exact solutions for the coupling response of two nonuniform coupled lines with particular variations of the coupling coefficients are presented. The results obtained from the exact closed-form solutions should aid in the design of tapered couplers. 相似文献
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随着集成电路工艺进入到深亚微米阶段,传输线特性分析对于集成电路设计和优化具有重要意义。针对非均匀传输线的ABCD参数,建立传输线数学模型,通过传输线电报方程推导出ABCD参数满足的微分方程组,并采用龙格-库塔法进行求解得到ABCD参数,最后通过数值算例验证了方法的有效性。 相似文献
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《Microwave Theory and Techniques》1960,8(3):339-342
By assuming that the current on a lossy transmission line flows in the axial direction, only a variational integral for the propagation constant can be readily obtained. This variational integral shows that the usual power loss method of evaluating the attenuation constant is valid for general transmission lines. This variational integral also shows that the perturbation of the loss-free phase constant is due to the increase in magnetic field energy caused by penetration of the field into the conductors. 相似文献
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《Microwave Theory and Techniques》2009,57(2):374-382
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有损均匀传输线的PSpice仿真分析 总被引:1,自引:1,他引:1
有损均匀传输线的电压、电流既是时间的函数,也是距离的函数,需要用分布参数电路模型分析.有损均匀传输线方程是偏微分方程,正弦稳态解的手算求解比较复杂.应用PSpice对有损均匀传输线进行仿真分析,可得到传输线上任一点的电压、电流的频率特性和正弦稳态波形.本文介绍了有损均匀传输线的PSpice模型和参数,通过实例说明了其应用方法,通过对比可知仿真分析比手算求解更清晰地阐明了物理概念. 相似文献
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Transient Response of Multiconductor Transmission Lines Excited by a Nonuniform Electromagnetic Field 总被引:22,自引:0,他引:22
Agrawal A.K. Price H.J. Gurbaxani S.H. 《Electromagnetic Compatibility, IEEE Transactions on》1980,(2):119-129
The time-domain transmission-line equations for uniform multiconductor transmission lines in a conductive, homogeneous medium excited by a transient, nonuniform electromagnetic (EM) field, are derived from Maxwell's equations. Depending on how the line voltage is defined, two formulations are possible. One of these formulations is considerably more convenient to apply than the other. The assumptions made in the derivation of the transmission-line equations and the boundary conditions at the terminations are discussed. For numerical calculations, the transmission -line equations are represented by finite-difference techniques, and numerical examples are included. 相似文献
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本文从频域电报方程出发推出了一个描述传输线ABCD矩阵的微分方程,将传输线时域响应分析从微分方程的边值问题转化为数学上更易求解的初值问题。然后利用波形迭代法数值求解非均匀传输线的ABCD矩阵,证明了一个关于迭代收敛性的定理,并据此采取了旨在加快收敛速度的将传输线分割成许多相互级联的子网络的步骤。传输线的ABCD矩阵求得后,便可借用付里叶变换和卷积技术对具有线性、非线性负载的传输线时域响应进行分析。给出的应用实例表明,诙分析方法是有效而可靠的。 相似文献
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精细计算多导体耦合传输线时域响应 总被引:3,自引:0,他引:3
本文在多导体耦合传输线时域响应的分析中,引入一种精细计算法,该方法是一种半解析的计算法,它不同用于传统的基于FFT的频-时域转换的分析法,而是直接在时域内分析,并且不需要对耦合的电报方程进行解耦,具有快速,简便,准确等优点。 相似文献
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《Microwave Theory and Techniques》1986,34(6):660-666
A novel method for transient analysis of Iossy transmission lines with arbitrary nonlinear terminal networks is presented. The uniqueness of this approach is that we develop time-domain Green's functions for the multiport transmission-line systems by terminating the ports in quasi-matched loads. This ensures Green's functions of a short duration. Hence, the amount of frequency-domain data necessary to obtain time-domain Green's functions is modest. These Green's functions are then convolved with the line port voltages. With this technique one can analyze responses of multiconductor transmission lines with arbitrary nonlinear loads (even with memory) as we have at any instant of time Thévenin's equivalent of the linear portion of the system. An example is presented to illustrate the application of this technique to multiconductor nonlinearly loaded transmission lines. 相似文献