摘要
随着无线通信系统的快速发展,尤其是5G时代的来临,带通滤波器作为射频前端的选频器件被广泛应用于各种系统.近年来,人们对通信的需求日益提升,因此滤波器的小型化、低成本以及高性能等方面的要求成为业内研究的重点.现代工艺技术的发展为带通滤波器的设计提供了多种方法,如使用阶跃阻抗谐振器设计微带带通滤波器、利用互补开环谐振器作为基本谐振单元构造宽带带通滤波器和基于E型双模谐振器设计微带带通滤波器等.然而,这些微带滤波器的尺寸较大,令实现小型化的目标难以实现.由于集总元件具有体积小、成本低、带宽宽、元件间相互作用小等优点,在射频器件设计中发挥着重要作用.相较于基于集成无源器件(Integrated Passive Device,IPD)工艺和低温共烧陶瓷(Low-Temperature Co-fired Ceramic,LTCC)工艺的带通滤波器,这种单层宽带带通滤波器具有更低的生产成本、更少的损耗限制,以及避免了基于表面贴装器件的成本和制造公差等问题.由于其采用交指电容和微带电感的简单实现方式,该方法所设计的滤波器还具有工艺简单和体积小的优点.基于单层印刷电路板(Printed Circuit Board,PCB)工艺,本文提出了一种新型高选择性宽带带通滤波器.该电路结构对称,由多组对称的串联谐振器构建滤波器通带和带外多零点特性.其中,为了增强阻带的抑制能力和滤波器的频率选择性,添加多对接地的串联谐振器在通带左右两侧各增加一个传输零点,两个传输零点独立控制,互不影响.使用奇偶模分析方法对电路进行分析,以求解传输零点,并给出零点解析式.随后,对带通滤波器的传输零点频率、中心频率、3 dB相对带宽以及品质因数等参数变化进行分析.为了实现小型化和低成本的要求,该电路中的所有集总元件均由交指电容和微带电感实现.交指电容是一种多指周期性结构,具�
With the rapid ongoing development of wireless communication systems,and especially with the advent of the 5G era,bandpass filters(BPFs)are being used widely as frequency-selective devices in various systems.In recent years,the demand for communications has been increasing,causing the requirements for miniaturization of filters at low cost and with high performance to become the focus of research in the industry.The development of modern processing technology has provided various methods for BPF design,including microstrip BPF design using stepped impedance resona⁃tors,construction of a broadband BPF by using a complementary split-ring resonator as the basic resonant unit,and mi⁃crostrip BPF design based on an E-shaped dual-mode resonator.However,these microstrip filters are relatively large in size,making it difficult to achieve the miniaturization goal.Lumped elements offer advantages that include small size,low cost,wide bandwidths,and low interaction between components,and these elements play an important role in radio-frequen⁃cy(RF)device design.When compared with BPFs based on integrated passive device(IPD)technology and low-tempera⁃ture co-fired ceramic(LTCC)processing,the single-layer wideband BPF presented here has lower production costs,reduced loss restrictions,and avoids the cost and manufacturing tolerance issues associated with surface mount devices.Because of its simple implementation using interdigital capacitors and microstrip inductors,the proposed filter also offers the advantag⁃es of simple processing and small device size.Based on the single-layer printed circuit board(PCB)fabrication process,this paper proposes a novel high-selectivity wideband BPF.The circuit structure is symmetrical and comprises multiple groups of symmetrical series resonators that construct the passband and produce multiple zeros outside the passband.To enhance the stopband suppression ability and the frequency selectivity of this filter,multiple groups of grounded series resonators are added,which results in t
作者
张薇
吴永乐
王卫民
郝丽薇
杨雨豪
ZHANG Wei;WU Yong-le;WANG Wei-min;HAO Li-wei;YANG Yu-hao(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;School of Integrated Circuits,Beijing University of Posts and Telecommunications,Beijing 100876,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2023年第6期1413-1420,共8页
Acta Electronica Sinica
基金
国家自然科学基金(No.U20A20203,No.U21A20510,No.61971052)
北京邮电大学中央高校基本科研业务费行动计划(No.2021XD-A07-2)
广东省重点领域研发计划(No.2020B0101080001)。
关键词
带通滤波器
LC谐振器
传输零点
交指电容
微带电感
bandpass filter
LC resonator
transmission zero
interdigital capacitor
microstrip inductor
