【作者】 杨帆；

【导师】 姬五胜；

【作者基本信息】 兰州理工大学 ， 通信与信息系统， 2011， 硕士

【摘要】 随着微波电路的迅速发展,能够对其进行高效准确分析的电磁场分析方法得到了广泛的应用。特别是近些年来,单片微波集成电路(MMIC)和平面天线技术的出现和应用对平面电路和多层电路的快速准确计算与仿真提出了更高的要求。因此发展一种原理简单、计算速度快,并能够针对多层电路的电磁计算方法特别是快速算法有着重要的意义。波概念迭代法(WCIP)作为一种新颖的基于微波网络中波的概念的迭代方法,能够较好的解决微波电路不连续性所造成的散射问题,同时具有较低的计算复杂度。WCIP通过电场和电流密度引入入射波和散射波,并在第k-1次和k次的入射波和散射波之间建立起转换的递归关系式。当存储的各次叠加波收敛时停止循环,最后可得到电路交界面上的电流密度和电场分布。目前WCIP已在微波单层平面电路中得到了一定的应用,但还没有得到广泛的推广。本文引入针对微波多层平面电路分析的WCIP分析方法,该方法将WCIP与广义传输线理论相结合,通过波概念分析每一层平面电路的不连续性,同时利用广义传输线理论来分析层与层之间谱域波的关系,最后利用迭代运算计算出每一层电路的电磁场分布,进而求得电路的特征参数。另外,本文研究了影响WCIP计算速度的因素,对比了WCIP相对于其它电磁场数值方法在计算速度上的优势。本文利用WCIP对微波多层平面电路进行了仿真计算,主要分析了几种基于多层平面电路的微波天线。首先求得了多层天线电路表面的电磁场分布、导纳参数、S参数、驻波比(VSWR)、增益(Gain)等;其次将WCIP的仿真结果与Ansoft HFSS仿真结果或已有文献的结果进行对比,证明了WCIP分析微波多层电路的可行性;最后分析对比了WCIP与有限元法(FEM)、矩量法(MOM)的计算复杂度,验证了WCIP分析计算的高效性。更多还原

【Abstract】 The electromagnetic (EM) field numerical analysis method, which can analyzes the circuit efficiently and accurately, has been widely used with speed development of microwave circuit. Especially over the recent years, the appearance and application of microwave monolithic integrated circuit (MMIC) and flat plane antenna technique advances a higher analysis speed and accuracy demand for planar circuit and multilayer circuit. Consequently there are important implications for developing a new electromagnetic computational method especially fast algorithm which is with simple theory, fast calculating speed and aim at multilayer circuit.Wave Concept Iterative Process (WCIP), as a neoteric iterative approach, bases on the wave concept, and can work out the microwave circuit discontinuity scattering problem preferably. At the same time, the method has a lower computation complexity. WCIP introduces the incident wave and scattering wave by electric field and current density, builds the recurrence relation between the kth and (k+1)th incident wave and scattering wave. When the superposed waves are constringency, the iterative approach will stop the loop, then, electric field and current density distribution of the circuit interface are achieved. WCIP has been used in single layer microwave planar circuit, but this method is not widely extended to other area at the moment.In this paper, WCIP is introduced to analysis the multilayer microwave planar circuit. The new method combines WCIP with Generalized Transmission Line Theory, analysis the every circuit layer’s discontinuity by wave concept, defines the waves between layers by Generalized Transmission Line Theory, and calculates the electromagnetic distribution of every circuit layer by iterated operation, and then acquires the circuit characteristic parameters. Besides, the factors which affect the calculating speed of WCIP are also analysis in this article, the comparison of computation complexity proves the calculating speed advantage of WCIP.In this article, WCIP is used to analysis the multilayer microwave planar circuit such as some microwave antennas which are based on the multilayer circuit. Some circuit characteristic parameters of multilayer circuit antennas are achieved at first, such as electromagnetic distribution, admittance parameter, scattering parameter, VSWR, Gain. Then the simulation results will contrast with Ansoft HFSS’s or the reference results, which prove the feasibility that WCIP can analysis the multilayer microwave planar circuit. At last, the computation complexity of WCIP, FEM, MOM is under consideration and comparison, which validates the efficiency of WCIP.更多还原