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，但尚未完成，但为了实现基础研究的原定目标，已经开展了研究项目。所获得的结果如下所示。微带线和其他平面波导的分析：基于平板模展开法和模匹配法，推导出分析微带线和其他平面波导特性(传播常数和波导段的场分布)的合理等效网络。特别是对带状线、NRD波导、凹槽波导和微带线的等效网络进行了推导，并成功地应用于实际的波导特性计算。这一分析中的基本问题是要考虑板式模式的数量。2维波导不连续性问题：用模式展开和模式匹配的方法处理这些问题，得到了波导段的等效模式对应的多传输线和…的两种等效网络更多的不连续段，(1)阶跃不连续的多端口理想变压器和(2)结点不连续的福斯特型等值网络。导出了带状线和矩形波导不连续性的实用等效网络，并将其用于分析，成功地处理了正方形/斜角切割的直角弯曲和带状线/H面矩形阶跃不连续性。基于这些结果，我们可以确信这种等效网络概念可以应用于三维不连续问题的分析。滤波网络的综合计划采用福斯特等效网络，但由于工期的限制，无法在工程期内实现。然而，由于福斯特型等效网络对于结型不连续问题的分析是有效的和有用的，所以我们可以通过这种方法获得实现该滤波的良好前景。通过模态分析，给出了所需全频段的合理等效网络，可用于今后对高速微波数字电路的分析。较少

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