摘要
为解决在VHF和UHF频段内的紧耦合偶极子阵列(tightly coupled dipole array, TCDA)天线馈电网络设计困难、不利于工程化的问题,提出一款采用新型宽带同轴馈电的具有低剖面、双极化特点的TCDA天线设计方案.该天线采用双偶极子单元结构,由二阶Wilkinson功分器和新型宽带同轴巴伦共同组成馈电网络,接地短路枝节抑制E面共模谐振,频率选择表面(frequency selective surface, FSS)层抑制H面扫描失配.通过ADS-HFSS联合进行高效的电磁仿真,结果表明,该TCDA在110~500 MHz内电压驻波比(voltage standing wave ratio, VSWR)典型值<2,±45°扫描角度VSWR典型值<2.5,剖面高度小于0.1λ_(l ow).该天线具有剖面低、易于全金属化的特点,为超短波频段TCDA的工程实际化提供了一种可靠的方法.
In order to solve the difficulty in designing the feed network of tightly coupled dipole array antenna(TCDA)in VHF and UHF bands,which is not conducive to engineering,we propose a design scheme of TCDA antenna with low profile and dual polar characteristics fed by a new broadband coaxial Balun.The antenna adopts a double dipole element structure.The feed network is composed of a second-order Wilkinson power divider and a new coaxial broadband Balun.The grounding short-circuit branch suppresses the common mode resonance on the E-plane,and the frequency selective surface FSS layer suppresses the scanning mismatch on the H-plane.Through ADS-HFSS joint electromagnetic simulation,the simulation results show that the TCDA has a typical value of VSWR<2,±45°scanningλlowangle VSWR<2.5 within 110-500 MHz,and the profile height is 265 mm,which is less than 0.1.The antenna has the characteristics of low profile and easy metallization,which provides a reliable method for the engineering practice of ultrashort wave band TCDA.
作者
周承冕
岳家璇
肖科
丁亮
柴舜连
ZHOU Chengmian;YUE Jiaxuan;XIAO Ke;DING Liang;CHAI Shunian(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)
出处
《电波科学学报》
CSCD
北大核心
2023年第3期393-399,406,共8页
Chinese Journal of Radio Science
