用于24GHz毫米波车载雷达线性串联馈电贴片天线阵列互耦抑制的解耦结构设计  

Design of a Decoupling Structure for Mutual Coupling Reduction of LSFPA Antenna of 24 GHz mm-Wave Vehicle-Borne Radar

作　　者：刘晴天 肖涵 邓舒文 高仁璟[1,2] LIU Qingtian;XIAO Han;DENG Shuwen;GAO Renjing(State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian Liaoning 116024,China;Ningbo Institute of Dalian University of Technology,Ningbo Zhejiang 315016,China)

机构地区：[1]大连理工大学工业装备结构分析优化与CAE软件全国重点实验室,辽宁大连116024 [2]大连理工大学宁波研究院,浙江宁波315016

出　　处：《传感技术学报》2024年第9期1485-1490,共6页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(12172076)。

摘　　要：天线结构是毫米波雷达的核心部件之一,其天线性能决定着雷达的探测能力。针对24 GHz车载毫米波雷达的线性串联馈电贴片阵列(LSFPA)天线阵元间存在互耦的问题,提出了一种基于缺陷地和倒T形寄生元件的新型解耦结构。该解耦结构在线性串联馈电贴片阵列天线的两个最大的贴片下蚀刻两个尺寸相同的圆形缺陷地结构以调整阻抗匹配,在两个最近的和两个次近的贴片间插入尺寸不同的倒T(T1和T2)形寄生元件以减少贴片间的耦合。仿真和测试结果表明,提出的有解耦结构的串联馈电贴片阵列天线,在中心频率24.5 GHz处互耦减少了36 dB,与无解耦结构的线性串联馈电贴片阵列天线相比,设计的解耦结构有效地减少了天线阵元间的耦合。Antenna structure is one of the core components of millimeter wave radar,and the detection ability of millimeter-wave radar is determined by the performance of antenna.A new decoupling structure based on defected ground and inverted T parasitic elements is proposed to solve the problem of mutual coupling between linear series-fed patch array(LSFPA)antennas of 24 GHz vehicle-borne milli-meter wave radar.The decoupled structure etches two ring-defect ground structures of the same size under the two largest patches of the linear series-fed patch array antenna to adjust impedance matching,and inserts inverted T(T1 and T2)shaped parasitic elements with different sizes between the two nearest and next nearest patches to further reduce the coupling between the patches.Simulation and test results show that mutual coupling of the proposed linear series-fed patch array antenna with decoupling structure is reduced by 36 dB at the center frequency of 24.5 GHz.In comparison with the linear series-fed patch array antenna without decoupling structure,the de-signed decoupling structure effectively reduces the coupling between antennas.

关 键 词：毫米波雷达 阵列天线 解耦结构 隔离度 

分 类 号：TH741[机械工程—光学工程]