基于人工表面等离激元的超宽带带通滤波器  

An Ultra Wideband Bandpass Filter based on Spoof Surface Plasmon Polaritons

作　　者：束耀辉 汤一铭 李泽坤 SHU Yaohui;TANG Yiming;LI Zekun(College of Electronic and Optical Engineering&College of Flexible Electronics(Future technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,南京210023

出　　处：《光通信研究》2025年第2期93-98,共6页Study on Optical Communications

摘　　要：【目的】人工表面等离激元(SSPPs)具有诸多优秀的性能,如低损耗、高传输效率和对电磁波的束缚能力强等,被广泛应用于微波器件设计。文章基于SSPPs设计并研制了一款结构简单、易于加工和带外抑制性能良好的超宽带带通滤波器(BPF)。【方法】该BPF由两部分级联而成:对称加载开口谐振环(SRR)的共面波导(CPW)高通滤波结构和环型单元SSPPs的低通滤波结构。文章以BPF设计理论和SSPPs色散特性为基础,采用模块化和级联式的结构设计方法,对两部分结构分别进行仿真建模,研究了各关键结构参数与性能指标的依赖关系,并在此基础上进行容差分析、样品研制和测试。【结果】仿真结果显示,与传统的I型和T型单元相比,环型单元具有更好的慢波特性,所设计的超宽带BPF的通带范围为3.3~10.3 GHz,且可在结构设计中通过变化SSPPs单元结构尺寸来灵活控制其上截止频率。该BPF通带内回波损耗优于-13 dB,大部分插入损耗优于-1 dB,下边带带外抑制达到-25 dB,上边带带外抑制达到-30 dB,-20 dB内的矩形系数接近1,测试结果与仿真结果吻合度较好。【结论】文章所研制的BPF具有结构简单、加工方便成本低、频带宽和过渡带陡峭度好等特点,可以很好地实现滤波与带外谐波抑制功能,适合用于射频微波通信和仪器仪表测量等相关领域的电路与设备开发。【Objective】Spoof Surface Plasmon Polaritons(SSPPs)has the characteristics of low loss,high transmission efficiency,and strong binding ability to electromagnetic waves,which has been widely used in microwave device design.In this article,an ultra wideband Bandpass Filter(BPF)is proposed based on SSPPs,which features a simple structure,ease of processing,and excellent out-of-band suppression performance.【Methods】The BPF can be divided into two parts,a Coplanar Waveguide(CPW)high pass filter loaded with a pair of Split Ring Resonators(SRR)and a ring-shaped SSPPs low pass filter.The article is based on BPF design theory and SSPPs dispersion characteristics.It adopts modular and cascaded structural design methods to model the two parts of the structure separately.The dependency relationship between key structural parameters and performance indicators is studied.The tolerance analysis,sample development,and testing are also conducted.【Results】The proposed SSPPs low pass filter is composed of ring shaped SSPPs unit cells,which have better slow wave characteristics comparing with traditional I-shaped and T-shaped SSPPs unit cells.The proposed ultra wideband BPF has a passband range of 3.3~10.3 GHz.Its upper cut off frequency can be flexibly controlled in the structural design by changing the size of the SSPPs unit structure.The return loss within the passband of this BPF is better than-13 dB,with most insertion losses better than-1 dB.The out-of-band suppression reaches-25 dB for the lower stopband and-30 dB for the upper stopband.The rectangular coefficient within-20 dB is close to 1.The test results agrees well with the simulation results.【Conclusion】The developed BPF features a simple structure,convenient and low-cost processing,wide frequency band,and good steepness of the transition band.It can effectively realize signal filtering and out-of-band harmonic suppression functions,making it suitable for the development of circuits and equipment in related fields such as ridio frequency microwave communic

关 键 词：人工表面等离激元 带通滤波器 超宽带 共面波导 开口谐振环 

分 类 号：TN82[电子电信—信息与通信工程]