通带耦合特性独立可调的双频微带滤波器设计  

Design of A Dual-Bandpass Microstrip Filters with Independently Tunable Passband Coupling Performance

作　　者：梁飞[1] 罗斌[1] 吕文中[1] 

机构地区：[1]华中科技大学电子科学与技术系,武汉430074

出　　处：《微波学报》2011年第1期52-55,共4页Journal of Microwaves

基　　金：国家自然科学基金(50902055);湖北省自然科学基金(2008CBD315);中央高校基本科研业务费(HUST:2010MS002)

摘　　要：引入一种新型双通带滤波器耦合结构,采用微带线型SIR结构分别设计了切比雪夫型和准椭圆函数型2.4GHz/5.2GHz双频带通滤波器。运用电磁数值分析软件讨论了结构参数对双通带滤波器耦合性能的影响,以及准椭圆函数型滤波器耦合结构参数对其传输零点位置的影响,并在文中给出其变化规律。基于该耦合结构的新型双频带滤波器,设计自由度更高,两个通带所需耦合系数可以独立调节。根据以上结构参数所制备的样品,其性能测试结果与仿真结果吻合良好。A novel coupling structure for designing dual-bandpass filters has been introduced in this paper.Chebyshev and quasi-elliptic 2.4GHz/5.2GHz dual-bandpass filter are designed by using microstrip SIR structure.The influence of structure parameters on filter coupling performance and transmission zeros is discussed by using 3-dimension finite element analysis models.This structure improves design freedom to fit easily the specific coupling coefficients at each band simultaneously,the locations of each pass band can also be tuned independently.The measured results of the fabricated filter samples are in good agreement with the full wave simulation results.

关 键 词：SIR滤波器 传输零点 切比雪夫 准椭圆函数 双通带 

分 类 号：TN713[电子电信—电路与系统]