具有高次谐波宽带抑制新型微带发夹滤波器设计

The design of a novel microstrip hairpin filter high harmonics broadband suppression

提出了一种新型微带发夹型滤波器,通过在传统发夹滤波器结构之后采用短路短截线与高次谐波四分之一波长开路短截线并联谐振的方法,可在不影响中频信号的前提下,对高次谐波进行有效抑制。同时在开短路支节之间串联一段微带径向短截线,能实现对谐波的宽带抑制。仿真结果表明此滤波器结构紧凑,具有良好的级联特性,在结构和性能上具有较大优势,适用于多种微波通信系统。

A novel microstrip hairpin filter is proposed.Through a short stub and a high harmonic quarter wavelength open stub in parallel resonance following the conventional hairpin filter,the novel filter can suppress the higher harmonic effectively under the premise of not affect the IF signal.Then,through the series for a radial microstrip stub between the open short circuit branch section,the filter can achieve suppress harmonics with broadband.The simulation resuhs show that the novel filter has good characteristics of compact and can be easily cascaded.Also has a large advantage in the structure and performnce and can be applied in many microwave communication systems.