Design Of Interdigital Bandpass Filter

With the rapid development of the mobile communication industry, the electron counterdevices and the technologies of navigation in recent years, the demand of new microwave circuits and components and the require of improving the existing microwave circuits and components is very high. As one of the important microwave components, the microwave filters also developed rapidly in recent years.There for, the home and foreign engineers of microwave components are very interested in the research of theoretical analysis and practical design for the microwave filters.This paper gives the particular description of a theoretical analysis and practical design for interdigital bandpass filter. Cylinder and suspended structure is used to realize interdigital bandpass filter. At first, this paper introduces the classes of microwave filters, in this part it also discusses the method of design the microwave bandpass filter, and especially introduces the theory of design the interdigital bandpass filter in particular. Secondly, based on the method which introduced in the first part, using the advanced mathematical tool-Matlab, it can work out the initial dimension values of the microwave bandpass filter. Thirdly, using the advanced microwave simulation software, it can model the interdigital bandpass filter, and simulate, optimize the initial dimension values, so as to gain the final dimension values and the simulated graphs of the interdigital bandpass filter. The simulation result shows that the performance of the interdigital filter is basically identical to its theoretical value, which proves the method is valid.