超宽带平坦负群时延电路设计  

Design of Ultra-Wide Band Flat Negative Group Delay Circuit

作　　者：顾韬琛 万发雨[1] RAVELO Blaise GU Tao-chen;WAN Fa-yu;RAVELO Blaise(School of Electronics and Information Engineering,Nanjing University of Information Science&Technology,Nanjing,Jiangsu 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《电子学报》2024年第12期3967-3975,共9页Acta Electronica Sinica

基　　金：国家重点研发计划(No.2022YFE0122700);国家自然科学基金(No.62371241,No.62350610268);北京市自然科学基金(No.L233002);国家留学基金(No.202308320302)。

摘　　要：本文提出了一种具有超宽带(Ultra-Wide Band,UWB)平坦负群时延响应的带通(BandPass,BP)负群时延(Negative Group Delay,NGD)电路设计.基于阶梯阻抗谐振(Stepped Impedance Resonator,SIR)结构设计了一种超宽带平坦负群时延无源电路.研究了电路的S参数模型和负群时延响应模型.电路结构紧凑,总尺寸为11 mm×81 mm,电尺寸仅为0.13λ_(g)×1.01λ_(g).经过测量,所提出的NGD电路在中心频率2.14 GHz下能实现-0.52 ns的负群时延值,负群时延带宽达1.28 GHz,相对带宽61%,平坦负群时延带宽达1.01 GHz,相对带宽48%,通带内的平坦度较好,群时延波动仅为±0.05 ns,与同类宽带平坦NGD电路相比,本文所提出的SIR NGD电路平坦NGD带宽提高了约215%.平坦带宽内回波损耗优于17 dB,最高为18.8 dB.A fundamental theory of novel ultra-wide band(UWB)bandpass(BP)negative group delay(NGD)topolo-gy is established in this paper.The microwave circuit under study consists of lossy transmission lines and stepped imped-ance resonators.The flat NGD topology is constructed using fully distributed elements.The ABCD-and S-parameter mod-els are formulated to derive the NGD optimal values and bandwidth.In order to verify the theoretical feasibility,NGD proto-types are designed,fabricated,and measured.The flat BP-NGD microstrip circuit has a compact size of 11 mm×81 mm(0.13λ_(g)×1.01λ_(g))with a NGD center frequency of f_(n)=2.14 GHz.Excellent agreement has been observed between experi-mental and theoretical results,revealingΔf_(NGD)=1.28 GHz(BW_(NGD)=61%fn)NGD bandwidth and t_(n)=-0.52 ns NGD value.Fur-thermore,within the NGD frequency band,the flat BP-NGD prototype presents a good performance in terms of bandwidth aboutΔf_(NGD)=1.01 GHz,BW_(flat-NGD)=48%f_(n) with tn±0.05 ns group delay fluctuation.Compared with similar broadband flat NGD circuits,the flat NGD bandwidth of the SIR NGD circuit proposed in this article is increased by about 215%.The flat BP-NGD prototype return loss at the center frequency is better than 18.8 dB.

关 键 词：负群时延 平坦群时延 阶梯阻抗谐振 S参数 设计公式 超宽带 

分 类 号：TN70[电子电信—电路与系统]