一款应用于微波探测脑中风的天线设计  

Design of an Antenna for Microwave Detection of Stroke

作　　者：俞鲜容 孙逢圆[1] 王波[2] 廖欣[1] 姜兴[1] YU Xian-rong;SUN Feng-yuan;WANG Bo;LIAO Xin;JIANG Xing(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China;Xi'an Electronic Engineering Research Institute,Xi'an 710100,China)

机构地区：[1]桂林电子科技大学信息与通信学院,桂林541004 [2]西安电子工程研究所,西安710100

出　　处：《微波学报》2021年第3期29-34,共6页Journal of Microwaves

基　　金：国家自然科学基金(61761012);广西重点实验室基金(GXKL06170109);广西壮族自治区中青年教师基础能力提升项目(C77KYO00RX);广西科技基地和人才专项(桂科AD19245051)。

摘　　要：针对目前微波探测脑中风成像系统中天线单元高增益、定向辐射、小型化等需求,设计了一款尺寸为0.28λ×0.28λ×0.17λ(其中λ为天线最低工作频率所对应的工作波长)的平面定向单极子天线。该天线由渐变型辐射单元和开槽接地板组成,辐射单元由半椭圆形与阶梯矩形相结合构成,接地板开槽结构与辐射单元结构类似。为了增强天线的定向辐射特性,使用理想电导体(PEC)作为天线的反射板。结果表明,该天线S11<-10 dB的工作频带为1.15~3.05 GHz,最大增益达到7.58 dB,在整个工作频带内天线的辐射方向图呈现定向辐射的特性。对天线进行加工测试,实测结果与仿真结果吻合良好。该天线可以应用于微波探测脑中风等领域。In order to meet the requirements of high gain, directionality and miniaturization of the antenna unit in the microwave imaging system for stroke detection, a planar monopole antenna with a size of 0.28λ×0.28λ×0.17λ(λ denotes the free space wavelength at lower frequency)is designed. The antenna is composed of a gradual radiating element and a slotted ground plate. The radiating element is composed of a combination of a semi-ellipse and a stepped rectangle, and the slotted structure of the ground plate is similar to the structure of the radiating element. The perfect electric conductor(PEC) is used as the reflector of the antenna to enhance the directional radiation characteristics of the antenna. The results show that the working frequency band of S11<-10 dB is 1.15-3.05 GHz, and the maximum gain reaches 7.58 dB, the radiation pattern of the antenna shows the characteristics of directional radiation in the whole working frequency band. The antenna is processed and tested, and the measured results are in good agreement with the simulation results. The antenna can be used in microwave detection of stroke and other fields.

关 键 词：单极子天线 定向性 高增益 宽带 脑中风 

分 类 号：TN820[电子电信—信息与通信工程] TH77[机械工程—仪器科学与技术]