基于隐式空间映射法设计的双频带滤波器

Design of Dual-Bandpass Microstrip Filter Based on Implicit Space Mapping

参数提取是隐式空间映射算法(ISM)的关键,为改善参数提取过程中可能导致的算法不收敛性,通过对参数提取过程施加限制条件,对迭代进程加以约束,然后以一种改进的枝节加载双模方形谐振器为例,利用隐式空间映射算法设计了一个可工作在无线局域网(WLAN)频段的微带双频段带通滤波器,中心频率为2.45GHz和5.25GHz,经过3次仿真迭代获得一组合适的设计参量并微调后,得到更优的响应结果,由此验证了算法的可行性和准确性。

The parameter extraction is a key step in implicit space mapping algorithm（ISM）.In order to improve the algorithm convergence properties during the process of parameter extraction,in this study,a constrained condition is applied to the parameter extraction process,and the iteration process is also has constrained.Then the method is demonstrated using a improved stub-loaded dual-mode square loop resonator,and a dual-band microstrip filter with ISM band is designed,its center frequencies are 2.45 GHz and 5.25 GHz.A set of design parameters are obtained after only three optimization iterations and some fine-tuning,the better response results validate that our approach is feasible and accurate.