基于平行带线的新型强阻带抑制带通滤波器

基于平行带线的新型强阻带抑制带通滤波器

内容简介：提出一种新型的基于平行带线的带通滤波器,在不增加电路尺寸的基础上增强了滤波器的阻带抑制.该滤波器以平行带线进行馈电,包含顶层和底层2个完全相同的电路,两层电路中电流反相,可以认为这2个电路是级联工作的.与传统的微带线构成的相似结构和同样带宽的滤波器相比,该滤波器具有更强的阻带抑制、更陡峭的衰减以及更小的尺寸,其中阻带抑制最大能提高近50%.仿真和测试结果对比表明,两者吻合较好,验证了设计方法的可靠性.

Abstract：A novel bandpass filter based on double side parallel-swip line （DSPSL） is presented in this paper, which has stronger rejection in the stopbands, without size increasing. The proposed filter consists of two identical circuits on the bottom layer and top layer. The two circuits can be treated as a cascaded connection due to the out-of-phase currents of the two layers fed by DSPSL. For the same configurations and passband bandwidth, the proposed bandpass filter allows sharper roll-off, higher rejection in the stopbands, and has more compact size, and the maximum stop band rejection can increase nearly 50%, compared with that of the bandpass filter using microstrip line. Simulated and measured results indicate the two match well. which verifiv that the proposed idea is reliable.

作者：唐慧, 周立衡, 陈建新,

关键词：平行带线, 阻带抑制, 带通滤波器, 传输零点