| 1. | Two methods of analysis and design programs of filters are given . 3 . some examples of filters are designed for special requirements , including combline , interdigital line and direct coupled 2 .对抽头线单元和内部耦合结构进行了详细研究,给出了等效电路和参数提取两种分析方法,并编写了相应的设计程序。 |