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Miniaturized tri-band bandpass filter design using quarter-wavelength shunted-line stepped-impedance resonators (SLSIRs) with multi-transmission zeros
Journal of Physics D: Applied Physics ( IF 3.4 ) Pub Date : 2021-02-19 , DOI: 10.1088/1361-6463/abe333
Ruolin Wang 1 , Tao Zuo 2 , Haiwen Liu 1
Affiliation  

In this paper, a miniaturized tri-band bandpass filter (BPF) is proposed with a pair of quarter-wavelength shunted-line stepped-impedance resonators (SLSIRs). The resonant characteristics, high design freedom and tuning relationship of multi-dimension parameters of SLSIR are studied and applied to the tri-band design. To obtain the great enhancement of skirt slope, multi-transmission zeros (multi-TZs) are introduced below and above the passbands and the selectivity is improved significantly. The miniaturization of subwavelength and electric/magnetic coupling are introduced and the propagation of electromagnetic wave is manipulated. Moreover, different kinds of generation mechanisms of the produced five TZs are investigated, illustrated and classified. Based on the multi-path transmission of signal, self-coupling effect and self-resonance of feed lines, the multi-TZs are excited and produced. The electric/magnetic coupling and current density distributions are plotted and analyzed. For validation, the designed second-order tri-band BPF centered at 2.35/4.89/7.42 GHz is fabricated and measured. Good agreement between the measured multi-band performances and the simulated frequency responses are observed and can be used to verify the feasibility of design concept.



中文翻译:

使用具有多传输零点的四分之一波长分流线步进阻抗谐振器(SLSIR)的微型三带通滤波器设计

本文提出了一种带有一对四分之一波长分流线步进阻抗谐振器(SLSIRs)的小型三带通滤波器(BPF)。研究了SLSIR的谐振特性,较高的设计自由度和多维参数的调谐关系,并将其应用于三频段设计。为了极大地提高裙边坡度,在通带的上下分别引入了多个透射零点(multi-transmission zeros,multi-TZs),从而大大提高了选择性。介绍了亚波长的小型化和电/磁耦合,并控制了电磁波的传播。此外,对产生的五个TZ的不同种类的生成机理进行了研究,说明和分类。基于信号的多径传输,馈线的自耦合效应和自谐振,激发并产生了多个TZ。绘制并分析了电/磁耦合和电流密度分布。为了验证,制造并测量了以2.35 / 4.89 / 7.42 GHz为中心的设计二阶三频BPF。观察到所测得的多频段性能与模拟频率响应之间的良好一致性,可用于验证设计概念的可行性。

更新日期:2021-02-19
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