摘要
针对高性能交叉耦合基片集成波导带通滤波器的应用,提出一种新型负耦合结构,该耦合结构由两个短路耦合线设计实现,并详细分析了其特性,能够实现较弱或较强的负耦合。总结了基于特征多项式的耦合矩阵综合优化方法,并通过两个滤波器的设计进行说明。基于综合得到的两个耦合矩阵,设计了两个中心频率为10 GHz的四阶交叉耦合基片集成波导带通滤波器,第一个滤波器的归一化相对带宽为3%,负耦合结构提供交叉耦合,用于说明该耦合结构提供相对较弱的耦合强度;第二个滤波器的相对带宽为8%,负耦合结构提供主耦合,用于说明该耦合结构提供较强的负耦合强度。为了验证滤波器的实际性能,对这两款滤波器进行了加工和测试。测试和仿真结果一致性较好,表明了该负耦合结构用于高性能交叉耦合基片集成波导滤波器设计的可行性。最后讨论了弱色散交叉耦合对传输零点位置的影响。
To design cross-coupled substrate integrated waveguide(SIW)bandpass filters(BPFs)with high performance,a new negative coupling structure is proposed,which is constructed by two coupled lines with shorted ends.The negative coupling structure is analyzed in detail.The stracture which can realize both relatively weak and strong negative coupling strength.The optimization method based on characteristic polynomials and reference zeros and poles of scattering parameters is realized for the filter design.To verify the proposed negative coupling structure,two fourth-order cross-coupled SIW BPFs with the center frequency of 10 GHz based on the optimized coupling matrixes are designed.The first one has a normalized bandwidth of 3%with a negative coupling in one cross-coupling path to illustrate the realization of weak negative coupling strength,and the second one has a normalized bandwidth of 8%with a negative coupling in one main coupling path to illustrate the realization of strong negative coupling strength.Finally,the two BPFs are fabricated and measured.Simulation and measurement results are in good agreement,which demonstrates the feasibility of the proposed negative coupling structure and its application on crosscoupled SIW filters with high performance.The influence of weak disperse cross coupling on locations of transmission zeros is also discussed.
作者
刘庆
吕大龙
卞晨阁
周东方
Liu Qing;LüDalong;Bian Chenge;Zhou Dongfang(Information Engineering University,Zhengzhou 450001,China)
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2019年第12期12-18,共7页
High Power Laser and Particle Beams
关键词
带通滤波器
基片集成波导
负耦合
交叉耦合
近似椭圆响应
广义切比雪夫响应
耦合矩阵综合
bandpass filter
substrate integrated waveguide
negative coupling
cross coupling
quasielliptic response
generalized Chebyshev response
coupling matrix synthesis
