一种新型带状线低通滤波器的研究

Research of a Novel Stripline Low-Pass Filter

文章借助三维电磁仿真软件HFSS,分析了带状线结构中的哑铃型DGS结构参数对电路性能的影响;并以五阶Chebyshev低通滤波器原型为基础,设计了一款带状线DGS结构的低通滤波器。与传统的阶梯阻抗低通滤波器相比,新型结构的滤波器截止频率更低、矩形系数更高,阻带范围约为截止频率的3倍,具有非常出色的谐波抑制特性,而物理长度却缩短了38%,适合于对电性能和物理尺寸有严格要求的场合使用。文章通过得出带状线DGS结构的电气特性,在需要基板层间走线和空间布局有限的场合下,拓展了DGS结构的应用范围。

In this paper,with the help of 3-D electromagnetic simulation software HFSS,the effect of changing several parameters of classical dumbbell shaped DGS in the stripline is discussed and analysed. And on the basis of the five order Chebyshev low-pass filter prototype,designed a stripline low pass filter of DGS structure,compared with the traditional ladder impedance low pass filter,a new structure of the filter cut-off frequency is lower,rectangular coefficient is higher,stopband range is 3 times of the cut-off frequency, have excellent harmonic suppression characteristics, and the physical length is shortened by 38%,suitable for the electrical and physical size have strict requirements of occasions to use. In this paper,the electrical characteristics of the shingled DGS structure were obtained,and the application scope of DGS structure was expanded in the case of limited space layout and routing between substrate layers.