The basic research on reasonable analysis and design method for passive microstrip-line circuit

虽然有些项目正在进行中，尚未完成，但研究项目已经开展，以实现基础研究的最初目标。得到的结果如下：1。微带线等平面波导的分析：基于板模展开法和模式匹配法，推导出用于分析波导特性（波导截面内的传播常数和场分布）的合理等效网络。特别是推导了带状线、NRD波导、沟槽波导和微带线的等效网络，并成功地应用于波导特性的计算。本分析的核心问题是要考虑的板型数。二维波导不连续问题：采用模式展开和模式匹配的方法处理二维波导不连续问题，得到波导截面的等效模式对应多传输线和波导截面的两种等效网络，(1)阶跃不连续的多端口理想变压器和(2)结不连续的福斯特型等效网络。推导了带状波导和矩形波导不连续的实用等效网络，并对其进行了分析，成功地处理了直角弯曲矩形/斜角切割和带状线/ h面矩形阶跃不连续。基于这些结果，我们可以确信该等效网络概念可以应用于三维不连续问题的分析。拟采用福斯特型等效网络合成滤波网络，但由于时间紧迫，无法在项目期间实现。然而，由于福斯特型等效网络对结点型不连续问题的分析是有效的和有用的，因此通过这种方法可以获得实现滤波的良好前景。通过模态分析，给出了所需全频带的合理等效网络，可用于今后高速微波数字电路的分析。少

The research projects have been carried out to fulfill the original aim of the basic research, although some items are on the way and not yet completed. Obtained results are listed below.1. Analysis of microstrip line and other planar waveguide : Reasonable equivalent network for the analysis of waveguide characteristics(propagation constant and field distribution in the waveguide section) is derived based on slab-mode expansion method and mode matching method. Especially, equivalent network for stripline, NRD guide, groove guide and microstrip line have been derived and practically applied for calculation of waveguide characteristics with success. Essential problem in this analysis ins number of slab-mode to be taken into account.2. 2-dimension waveguide discontinuity problems : These problems are treated by mode expansion and mode matching method, which leads to the equivalent mode-corresponding multi-transmission line for the waveguide section and two types of equivalent network for … More discontinuity section, (1) multi-port ideal transformer for the step discontinuity and (2) Foster-type equivalent network for junction discontinuity. Practical equivalent network for stripline and rectangular waveguide discontinuity are derived and used for analysis, where right angle bend with square shaped/slantwise corner cut and stripline/H-plane rectangular step discontinuity are treated with success. Based on these results, we can get the confidence that this equivalent network concept can be applied to the analysis of 3-dimensional discontinuity problem.3. Foster-type equivalent network is planned to be used for syntheses of filter network, which cannot be realized during the period of project because of the shortage of time. However, we can get the good perspective to realize the filter by this method, because Foster-type equivalent network is proved to be valid and useful for analysis of junction type discontinuity problem.4. Reasonable equivalent network for the require full band is given by modal analysis, which can be applied for analysis of high-speed microwave digital circuit in future. Less