Design of Ultra-WideBand Dual Trap Filter Based on Active Space Mapping Algorithm

In this paper, the Active Space Mapping algorithm is applied to an Ultra-WideBand dual trap filter with a relatively novel structure. Algorithms are implemented by using Matlab program assistance. The adaptive step iteration of the filter structure has more than a dozen variable parameter values. The optimal solution of the exact model is obtained only by the seventh iteration, thus it completed the fast and optimal design of the planar filter. Test results show that this filter has less than 2dB loss and less than 2.5dB flatness in the 4-12GHz band. Compared with the Initial Spatial Mapping algorithm, the Active Spatial Mapping algorithm no longer requires multi-point parameter extraction and a large number of simulations of the exact model, which largely saves time costs and computer resources, and has good practicality in engineering.