新型交叉耦合双模宽带带通滤波器设计  

Novel Cross-coupled Dual-mode Wideband Bandpass Filter

作　　者：雷涛[1] 向天宇[2] 张正平[1] 

机构地区：[1]贵州大学电子信息学院,贵阳550000 [2]贵州师范大学机械与电气工程学院,贵阳550000

出　　处：《现代雷达》2015年第1期67-69,73,共4页Modern Radar

基　　金：国家自然科学基金项目(60666001);贵州省科技厅-贵州师范大学联合基金项目(20147013)

摘　　要：采用变形的阶梯阻抗谐振器(SIR)设计了一款小型化、高性能新型宽带带通滤波器。通过对经典的SIR进行弯折,在高阻抗线之间引入交叉耦合构成交叉耦合多模谐振器。该谐振器具有与经典SIR相同的谐振模式,由前两个谐振模式构成通带,并且在上下阻带产生两对对称的传输零点。该带通滤波器结构紧凑、带内差损非常小,同时由于带外传输零点的存在,一阶杂散得到有效抑制,带外特性明显改善。A novel miniaturized and high performance wideband bandpass filter using a single modified stepped impedance resonator （SIR） is presented. By bending the classical SIR, cross-coupling is introduced between the high-impedance lines to construct cross-coupled multiple-mode resonator. The resultant resonator can not only provide the first double resonances of a classical SIR for building a passband, but also produce two pairs of symmetrical transmission zeros at the lower and upper stopbands simultane- ously. The filter has compact size and very low insertion loss. Meanwhile, the first stray is also suppressed by the transmission ze- ros, leading to the significantly improved out-of-band performance.

关 键 词：阶梯阻抗谐振器 交叉耦合 传输零点 杂散抑制 

分 类 号：TN713.5[电子电信—电路与系统]