基于槽线结构的信号干涉带阻滤波器仿真研究

Simulation Study on Signal Interference Band-stop Filter Based on Slotline Structure

为了实现更高的特征阻抗和良好的宽带滤波特性,提出了一种基于槽线结构的信号干涉带阻滤波器设计。相比于传统微带线结构的滤波器,在阻抗比一定时,槽线结构可以实现更高的特征阻抗。为了验证这一结论,分别设计了微带线结构与槽线结构的信号干涉带阻滤波器进行仿真对比。两种结构滤波器的仿真结果显示,槽线结构的通带性能及品质因数等指标明显优于微带线结构,且阻带抑制提高了约15.5%。因此,基于槽线结构的信号干涉带阻滤波器的滤波性能具有更大的优势。

To realize higher characteristic impedance and good broadband filtering property,this paper proposes a signal interference band-stop filter based on slotline structure.Compared with the conventional filter with microstrip structure,the slotline structure can achieve higher characteristic impedance when the fixed impedance ratio is certain.To verify this conclusion,the signal interference band-stop filters based on microstrip line and slotline structure are designed respectively for simulated comparison.Thesimulation results indicate passband property of slotline structure and quality factor are significantly superior to those of microstrip structure;besides,stop-band inhibition improves by about 15.5%.Thus,filtering property of signal interference band-stop filter based on slotline structure has larger advantage.