新型折叠多模微带带通滤波器设计

Design of NOVEL microstrip bandpass filter using folded multiple-mode resonator

文中提出了一种新型的小型化微带带通滤波器设计方案。方案所提微带带通滤波器的基本结构是折叠多模谐振器,该谐振器不仅具有谐振元件的特性,还能作为开路短截线。新型微带带通滤波器能够实现宽频带的通带响应,并在通带内具有较低的插入损耗和良好的阻带匹配特性,且在通带外额外产生了一对传输零点。本文给出了滤波器的等效电路分析和初步设计方案。该滤波器的最大优点在于进一步减小了滤波器尺寸,同时改善了滤波器的衰减极点,其中心频率为5.2 GHz。

A novel miniaturization design of microstrip bandpass filter is proposed. Based on the design schema, the filter contains only one folded multiple-mode resonator, which operates as not only a resonant element but also an open stub. The filter simultaneously realizes broad bandpass, low insert loss and good matching can be achieve, which include a pair of transmission zeroes out of bandpass additionally. A lucid equivalent is given both for analysis and initial design of the proposed filter. The biggest advantage of this filter is to further reduce the size and improve the transmission poles. Its center frequency is 5.2 GHz.