A Compact Ultra-Wideband Circularly Polarized Antenna Array for Vehicular Communications  

作　　者：Wei He Yejun He Long Zhang Jun Hong Haixia Cui Amir Boag 

机构地区：[1]School of Electrical and Information Engineering,Hunan Institute of Technology,Hengyang 421002,China [2]College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China [3]School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510630,China [4]School of Electrical Engineering,Tel Aviv University,Tel Aviv 69978,Israel

出　　处：《China Communications》2023年第6期310-320,共11页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(NSFC)under Grant No.62071306;in part by Shenzhen Science and Technology Program under Grants JCYJ202001091-13601723,JSGG20210802154203011 and JSGG-20210420091805014。

摘　　要：In this paper,a new compact ultrawideband(UWB)circularly polarized(CP)antenna array for vehicular communications is proposed.The antenna array consists of a 2×2 sequentially rotated T-shaped cross dipole,four parasitic elements,and a feeding network.By loading the T-shaped cross dipoles with parasitic rectangular elements with cut corners,the bandwidth can be expanded.On this basis,the radiation pattern can be improved by the topology with sequential rotation of four T-shaped cross-dipole antennas,and the axial ratio(AR)bandwidth of the antenna also can be further enhanced.In addition,due to the special topology that the vertical arms of all Tshaped cross dipoles are all oriented toward the center of the antenna array,the gain of proposed antenna is improved while the size of the antenna is almost the same as the traditional cross dipole.Simulated and measured results show that the proposed antenna has good CP characteristics,an impedance bandwidth for S11<-10 d B of about 106.1%(3.26:1,1.57-5.12 GHz)and the 3-d B AR bandwidth of about 104.1%(3.17:1,1.57-4.98 GHz),a wide 3-d B gain bandwidth of 73.3%as well as the peak gain of 8.6 d Bic at 3.5 GHz.The overall size of antenna is 0.56λ×0.56λ×0.12λ(λrefers to the wavelength of the lowest operating frequency in free space).The good performance of this compact UWB CP antenna array is promising for applications in vehicular communications.

关 键 词：circularly polarized antenna vehicle satellite communications cross-dipole antenna ultrawideband(UWB)antenna 

分 类 号：TN927.2[电子电信—通信与信息系统] TN820[电子电信—信息与通信工程] U463.67[机械工程—车辆工程]