螺旋滤波器的设计方法分析

Analysis on Design Method of a Helical Filter

介绍一种设计螺旋滤波器的方法,并给出一个滤波器的设计实例和仿真结果。设计时先用微波网络分析和滤波器设计理论计算出腔间耦合系数和外界Q值的理论值。在用高频结构仿真软件(HFSS)进行仿真时,采用了一种准螺旋结构得出实际的谐振腔的耦合结构,然后进行整体仿真优化,完成整个设计。应用这种方法可以简化螺旋滤波器仿真并大大减少有限元网格的划分时间,提高仿真效率,设计准确。

A design method of helical filter is introduced in this paper, meanwhile an example and its simulation results are given. The ideal coupling coefficient bewveen resonators and external Q value are worked out through microwave network analysis and filter design theory. For the simulation by using software of high frequency structure simulation （HFSS）, a quasi-Helical structure is adopted to get the practical coupling structure, and the entire simulation optimization is performed to realize the entire design. The design method can simplify helical filter simulation and reduce greatly finite element grid generation time, improve simulation efficiency and get an exact result.