摘要
介绍了一款工作于Ku频段的低互耦星载相控阵天线的设计方法,采用在阵列单元周围加载金属腔体的方式降低阵列单元之间的互耦效应,从而改善相控阵天线的方向图扫描特性.针对相控阵天线在二维±60°范围内低副瓣波束扫描的特点,对5×5子阵和16×16阵列进行了研究,验证了阵列的互耦降低方法的有效性和电性能.研究结果表明:相控阵单元间互耦小于-16dB,而相控阵单元在15.1~16.8GHz电压驻波比小于2,相对带宽11%;在频率为f_0±500 MHz范围内,E面3dB波束宽度大于98°,5dB波束宽度大于113°,H面3dB波束宽度大于113°,5dB波束宽度大于122°.在仿真设计的基础上,研制了子阵天线试验样机,测试结果与设计结果吻合良好,证明了降低互耦方法的有效性,天线单元方向图满足在±60°范围内波束扫描的要求,可应用于相控阵雷达系统.
Design of a phased array antenna with lower mutual coupling for the satellite application operating in Ku band is introduced in this paper.By loading the metal cavity around the array element,the mutual coupling effect can be reduced and then improve the scanning performance of the phased array antenna.With this method,the characteristics of phased array antenna with ±60°scanning in two dimensions are analyzed.To verify this design,5×5 subarray and 16×16 array are studied.The measured results show that the mutual coupling between the elements is less than-16 dB.The array element has an impedance bandwidth（VSWR≤2）of 11%（15.1—16.8 GHz）.In addition,within the bandwidth of f_0±500 MHz,the E-plane of the radiation pattern has a 3 dB beam-width of more than 113°and a 5 dB beamwidth of more than 122°,while the H-plane has a 3 dB beam-width of more than 98°and a 5 dB beam-width of more than 113°.Based on the simulation,aprototype of the 5×5 array antenna is fabricated herein.The measured results agree well with the simulated ones,which proves the effectiveness of the design.The beam width of the proposed element fully meets the requirement of a phased array antenna with a ±60°scanning range and can be used in phased radar system.
作者
卓超
张福顺
武向文
张洪银
ZHUO Chao1,2 ,ZHANG Fushun1, WU Xiangwen2, ZHANG Hongyin1(1. Key Lab. of Antennas and Microwave Technology, Xidian University, Xi＇ an 710071,China; 2. AVIC Forstar S＆T Co. Ltd. , Xi＇an 710077, Chin)
出处
《电波科学学报》
EI
CSCD
北大核心
2018年第2期149-155,共7页
Chinese Journal of Radio Science
关键词
相控阵天线
低互耦
单元
星载
phased array antenna
low mutual coupling
element
satellite application
