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基于多向馈电耦合的折叠小型化三带通滤波器
沈笛宇, 王 虹, 张光锋, 刘国庆
南京理工大学 电子工程与光电技术学院,江苏 南京 210094
摘要:
基于奇偶模理论,通过多向馈电耦合的方式,在十字形双频带通滤波器(DBPF)的基础上,研究并设计了一种十字形枝节折叠的双馈线三通带通滤波器(TBPF)模型。结构分析表明,该模型具有三频中心频率灵活独立可调,结构易级联,小型化和频率设计参量少的特点。仿真结果表明,增加的馈电方向激励起滤波器的第三通带,设计的TBPF在5G通信的中低频段和室内WiFi低频段具有良好的特性。文献比较显示,提出采用的多向馈电设计方法,减少了谐振器结构复杂度和频率设计参数个数,同时,该法对基础谐振器通带频段的增加有一定启示意义。
关键词:  奇偶模理论  多向馈电耦合  三带通滤波器  小型化
DOI:10.11805/TKYDA2019273
分类号:
基金项目:国家自然科学基金资助项目(61371038);近程高速目标探测技术国防重点学科实验室开放基金资助项目(30918014106)
Miniaturized folded tri-band bandpass filter based on multidirectional-feed coupling
SHEN Diyu, WANG Hong, ZHANG Guangfeng, LIU Guoqing
School of Electronic Engineering and Optoelectronic Technology,Nanjing University of Science and Technology,Nanjing Jiangsu 210094,China
Abstract:
Based on odd-even mode theory and multidirectional-feed coupling, a cross-shaped new structure Tri-band Band-Pass Filter(TBPF) with folded stub is studied and designed on the basis of cross-shaped Dual-band Band-Pass Filter(DBPF). The structure analysis shows that the TBPF based on multidirectional-feed has the characteristics of flexible and independent adjustment at the three center frequencies, easy cascade structure, miniaturization and less frequency design parameters. The simulation results show that the added feed-direction excites the third passband of the filter. The designed TBPF has good performance in 5G medium-low frequency band and Indoor WiFi band. Literature comparison shows that the proposed multi-directional feed design method reduces the structure complexity and the number of frequency design parameters of the resonator. Meantime, this method can provide reference for increasing passband numbers of the basic resonator.
Key words:  odd-even mode theory  multidirectional-feed coupling  Tri-band Band-Pass Filter  miniaturization

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