新型微扰结构双模贴片带通滤波器设计

针对微带滤波器高性能小型化的需求,提出了一种方环形微扰单元的双模贴片带通滤波器的设计.该滤波器由方形贴片作为谐振器,输入、输出端口采用直接馈电,具有对称结构.利用在方形贴片上蚀刻出方环形缺口的方式,对方形贴片谐振器进行微扰,实现双模滤波器.通过电磁仿真软件Ansoft HFSS分析了微扰单元的特性,对双模滤波器的性能进...

Design of Dual-mode Patch Bandpass Filter Using Novel Perturbation Structure

For the requirement of high performance and miniaturization of microstrip filters,a dual-mode patch bandpass filter with a square ring perturbation element is proposed.The filter uses a square patch as a resonator.The input and output ports are directly fed and the filter has a symmetrical structure.The method of etching the square ring slot in the square patch is used to perturb the square patch resonator,achieving a dual-mode filter.The characteristics of the perturbation element are analyzed by the electromagnetic simulation software Ansoft HFSS,and the performance of the dual-mode filter is simulated and optimized.At the same time,the dual-mode bandpass filter is fabricated and measured.Experimental results show that the center frequency of the filter is 3.32 GHz and the relative bandwidth is 6.9%.There is one transmission zero on both sides of the passband,which improves the stopband rejection.Good agreements are achieved between the simulation and measurement results.