可精确综合的超宽阻带等波纹微带低通滤波器  

Synthesis Design for Microstrip Lowpass Filter Having Equiripple Response and Ultra-wide Stopband

作　　者：黄晓东[1] 冯张浩鹏 郭稼逸 金秀华[1] HUANG Xiao-dong;FENG Zhang-hao-peng;GUO Jia-yi;JIN Xiu-hua(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学电子与光学工程学院,南京210003

出　　处：《微波学报》2023年第3期47-50,共4页Journal of Microwaves

基　　金：国家自然科学基金(61501257,61501258);南京邮电大学教学改革研究项目(JG10620JX09)。

摘　　要：利用公比线网络的可综合特性,设计实现了一种具有宽阻带特性和带内等波纹响应的传输线低通滤波器。该滤波器的原始设计以一段具有Z型拓扑的平行耦合线节为核心,在其四个独立端口处对称加载两对开路枝节线。当所有的传输线元件的电长度均相同时,对上述网络加以分析并得到完整的传输函数。利用平移匹配法,可以在满足指定截止频率和波纹系数的约束下,令其传输函数满足一组可调的等波纹响应。最后,利用开路扇形贴片等效低阻抗加载枝节线,完成实物滤波器的制作。测试与仿真结果吻合良好,验证了设计方法的有效性和正确性。In this paper,a novel commensurate line lowpass filter is presented and synthesized,which has equiripple in-band response and ultra-wide stopband.The initial filter topology is based on a “Z” shaped coupled-line section,on whose four nodes two pairs of open-circuited stubs are symmetrically loaded.All of those transmission line segments are identical in electrical length,as a result,the transfer function of the whole structure can be obtained after microwave network analysis.By using the equiripple matching procedure,the transfer function is forced to map the prescribed specifications,such as cut-off frequency and in-band ripple level.In the fabricated sample filter,radial stubs are used to replace the open-circuited stubs which have low impedance.The measured and simulated results agree well,which validate the design theory successfully.

关 键 词：低通滤波器 耦合传输线 滤波器综合 公比线 微带滤波器 

分 类 号：TN713.4[电子电信—电路与系统]