Optimized Algorithm And Realization Of Passive Network's Standing Wave Ratio's Characteristics

Passive network (including Passive filter, Matching network, Equalizer and so on) is key part of an apparatus in the system of wireless. With the rapid development of the information industry and the competition of the electronics' products, we are stricter and stricter to their instructors. Designing filters previously adopted network synthesizes theory or Broad band matching principle. These theories are becoming mature presently, but they get along slowly, so they can't satisfy the requirement of current development.Therefore, this text puts forward means of settling issues that is applying circuits optimizing technology instead of network synthesizes theory to solve matching issue .The intention is to solve the design of high-powered special filter and Matching network by using the flexible attribute of optimizing technology. While this design is far-deed of communicational technology' development and difficult to realize by adopting traditional method, therefore we apply this method in our design.This task come from fund items of National Natural Science-A Bran-new Passive Networks Design Theory and Realized Method., which optimizes the breadth-frequency's characteristics and the Voltage Standing Wave Ratio of the Passive network at the same time based on the method of traditional network's integrated design. The purpose of optimizing Voltage Standing Wave Ratio is to obtain the lesser reflection spoilage. Because the Voltage Standing Wave Ratio is a ratio of the bigger number and the smaller number between the output resistance and load resistance of the filter, so it is difficult to optimize.The article brings forward the optimizing method by adjusting parameters of components to make the curve of frequency—Standing Wave Ratio approach a beeline. Certainly, the curve of Standing Wave Ratio more near to beeline, it is more ideal. However, it isn't easy to overlap the beeline. So we can only require Standing Wave Ratio not exceeding the limit we request on the range of certain frequency. At the course of optimizmg, we first take the curve which is caused by initial value ofcomponents as the initial curve, then adjust components' parameter to make it try to near to the beeline until the degree accords with our request.The method owns a better optimizing achievement than the method of traditional network's integrated design, therefore as to Passive network, it posses an important meaning.