Research On Space Mapping In The Optimal Design Of Microwave Filters

With the prompt expansion of wireless communication technology, thefilter which is the key components in RF communication front-end continues toimprove design standards, in order to meet the higher performance requirements.Stage in the design of microwave filters, electromagnetic simulation software oftenhave to spend a lot of time to complete the simulation and optimization of the filter,when the space mapping method proposed is undoubtedly to solve this kind ofproblem for a broad idea. In this paper, mainly to improve the application of theimproved aggressive space mapping method in the microwave filters space mappingalgorithm of multiple complementary split ring resonator filter and cavity filterinstance of simulation and optimization to achieve the required design specifications.The main contents of this paper are as follows:First, the proposed novel improved aggressive space mapping algorithm, thisarticle analyzes the space mapping method optimization ideas, and expand the threetypes of space-mapping algorithm optimized for speed. Work includes two aspects,one is given to process the content of the aggressive space mapping algorithm,improved aggressive space mapping algorithm as well as implicit space mappingalgorithm；another is that parallel coupled microstrip filter design applied to3Gcommunication band, three algorithms were applied to the simulation andoptimization, and finally reached the requirements of the design specifications.Secondly, the design of multiple complementary opening ring resonatorbandpass filter structure is used of the improved aggressive space mapping algorithmto optimize the simulation. After that, the filter would do the physical processing testcomparison. Study the use of multiple complementary split ring resonator loadedmicrostrip line and the bandgap line. The equivalent circuit solved the relationship ofthe geometry parameters and lumped element parameters. Given the designspecifications and the design is based on multiple complementary ring resonator bandpass filter. The filter designed for Wireless Local Area Network(WLAN)communications bands, according to the improved aggressive space mappingalgorithm to optimize the simulation and optimization simulation time savings. Theresults obtained through the processing of test matched the simulation one.Finally, the design of six-cavity and cross-coupled bandpass filter withimproved aggressive space mapping algorithm to optimize the simulation. Used ofdifferent simulation software to build accurate model and rough model of the cavityfilter. The mapping between the two models is related with the coupling coefficientand other parameters and the filter geometry. Application of improved active spacemapping method cavity filter to optimize the simulation and compared, and finallythrough the iterative response effect close to the optimal response, but also verify thefeasibility of the use of the space mapping method in the cavity filter design the filtermay be used the Long Term Evolution(LTE) communications bands.