【作者】 陈龙；

【导师】 高惠芳； 宋开新； 胡元云；

【作者基本信息】 杭州电子科技大学 ， 电子科学与技术， 2023， 硕士

【摘要】 第五代（5th Generation,5G）通信技术的商用提高了通信速率,但同时频谱资源也愈发紧张,通信滤波器件能够有效地对收发信号进行频率选择。在5G通信中MIMO天线的阵列越来越多,使得收发通路也越来越多,因此对5G射频前端滤波器的需求大大增加,对滤波器的性能要求也不断提高。3GPP将5G NR分为FR1和FR2两大频谱范围。针对以上背景,本文对应用于5G通信中的滤波器进行了设计与研究,首先,针对FR1频率范围（450MHz-6000MHz,也称Sub-6GHz）设计了一款介质波导滤波器;其次,在FR2频段（24250MHz-52600MHz,即5G毫米波）,论文创新地提出一种实现平面负耦合的刻蚀环槽结构,并基于印刷电路板（PCB）工艺与低温共烧陶瓷（LTCC）工艺,结合创新结构共设计了三款基片集成波导（SIW）滤波器。主要工作如下:（1）设计加工了一款工作在Sub-6G频段的介质波导滤波器。该滤波器由四个介质谐振腔构成,引入交叉耦合实现双传输零点,选用本课题组自主研发的高性能介质陶瓷材料Li Mg_0.9Zn_0.6Ni_0.04-15wt%Ti O₂。该滤波器中心频率在4.65GHz,通带带宽0.3GHz。带内最大的插入损耗为0.62d B,回波损耗低于-20d B。（2）两款基于PCB工艺工作于5G毫米波频段的SIW滤波器设计与加工。两者的中心频率均为28.5GHz,通带1GHz。实例一滤波器设计由四个SIW谐振腔构成并采用交叉耦合结构,引入一对传输零点（位于27.7GHz、29.4GHz）,该交叉耦合结构由矩形刻蚀环槽实现,带内回波损耗小于-15d B,带内最小插入损耗2.31d B（含测试夹具插损）;实例二滤波器设计在实例一的基础上加入源和负载耦合,能再引入一对传输零点,来抑制实例一中的寄生谐振点并实现四个传输零点,滤波器带内回波损耗小于-24d B,带内最小插入损耗2d B（带测试夹具插损）。（3）为进一步实现SIW滤波器的小型化,设计与制备了基于LTCC工艺的四阶交叉耦合SIW滤波器。在设计中利用LTCC工艺的叠层优势将四个SIW谐振腔的摆放由同介质层放置改为两个介质层放置,从而实现SIW滤波器的小型化,并研究新型刻蚀环槽结构在LTCC工艺SIW滤波器中的应用。该SIW滤波器不需要增加额外的电路,工作于5G毫米波频段,中心频率24.9GHz,通带1.2GHz,回波损耗小于-16d B。更多还原

【Abstract】 The commercialization of the 5th Generation（5G）communication technology has improved the communication rate,but at the same time,the spectrum resources are becoming more and more scarce,and communication filters can effectively select the frequency for the transmitted and received signals.In 5G communication,there are more and more MIMO antenna arrays,making more and more transceiver channels.Therefore,the demand for 5G RF front-end filters has greatly increased,and the performance requirements for filters have also continuously improved.3GPP divides 5G NR into two spectrum ranges:FR1 and FR2.In view of the above background,this paper designs and studies filters used in 5G communication.Firstly,a dielectric waveguide filter is designed for 5G FR1（450MHz-6000MHz,Sub-6GHz）frequency range;Secondly,in the FR2 frequency band（24250MHz-52600MHz,5G millimeter wave）,the paper innovatively proposes an etching ring groove structure to realize planar negative coupling,and designs three SIW（Substrate Integrated Waveguide）filters based on the PCB（Printed Circuit Board）process and LTCC（Low-temperature Co-fired Ceramic）process.The main work is as follows:（1）A dielectric waveguide filter operating in Sub-6G band is designed and fabricated.The filter is composed of four resonators,and cross-coupling is introduced to achieve double transmission zeros.The high-performance dielectric ceramic material Li Mg_0.9Zn_0.6Ni_0.04-15wt%Ti O2 independently developed by our research group is selected.The center frequency of this filter is 4.65GHz,the passband is 0.3GHz.The maximum insertion loss in the band is 0.62d B,and the return loss is less than-20d B.（2）Design and Fabrication of two SIW filters based on PCB technology working in 5G millimeter wave frequency band.Both have a central frequency of 28.5GHz and a passband of 1GHz.The filter 1 is composed of four SIW resonators and adopts a cross-coupling structure,introducing a pair of transmission zeros（at 27.7GHz and 29.4GHz）.The cross-coupling structure is realized by a rectangular etching ring groove.The in-band return loss is less than-15d B,and the minimum in-band insertion loss is 2.31d B（with RF adapter）;The filter 2 adds source and load coupling on the basis of filter 1,and can introduce another pair of transmission zeros to suppress the parasitic resonance point of filter 1 and realize four transmission zeros.The return loss in the filter band is less than-24d B,and the minimum insertion loss in the band is 2d B（with RF adapter）.（3）In order to further realize the miniaturization of SIW filter,a fourth-order cross-coupled SIW filter based on LTCC technology was designed and fabricated.In the design,the stacking advantage of LTCC process is used to change the placement of four SIW resonators from the same layer to two layers,so as to realize the miniaturization of SIW filters,and the application of new etching ring groove structure in LTCC process SIW filters is studied.The SIW filter does not need to add additional circuits.It works in the 5G millimeter wave frequency band,with a center frequency of24.9GHz,a passband of 1.2GHz,and a return loss of less than-16d B.更多还原