中图分类号： TN821 文献标识码： A DOI：10.16157/j.issn.0258-7998.201817 中文引用格式： 杨龙，周文涛，王娜，等. 基于新型耦合器的紧耦合阵列天线研究[J].电子技术应用，2021，47(8)：123-127，132. 英文引用格式： Yang Long，Zhou Wentao，Wang Na，et al. Design of tightly coupled dipole array with novel capacitive coupler[J]. Application of Electronic Technique，2021，47(8)：123-127，132.
Design of tightly coupled dipole array with novel capacitive coupler
Yang Long1，Zhou Wentao1，Wang Na1，Zhang Zhiya2
1.Southwest China Institute of Electronic Technology，Chengdu 610036，China； 2.National Key Laboratory of Antennas and Microwave Technology，Xidian University，Xi′an 710071，China
Abstract： The tightly coupled array antenna has ultra-wideband performance and can be widely used in radar, communications, intelligence reconnaissance and other fields. In this paper, a wideband tightly coupled array antenna(TCA) adopts a novel capacitive coupler is proposed. The proposed capacitive coupler, called Archimedes capacitive coupler, is based on two partially overlapping transmission lines obtained by winding them followed the Archimedes spiral. In addition, in order to further increase the capacitance between the two adjacent elements, the coupler uses a double-layer printed structure. Meanwhile, an integrated Marchand balun and a dielectric superstrate are adopted for further improving the matching performance of the designed antenna. The simulated results show that the final array maintains an active VSWR<3 from 1.2～6.2 GHz while scanning up to 45° in all planes. A prototype is manufactured and measured to validate the method. The measured results are provided for broadside and it shows that the proposed antenna delivers minimum 5.2:1 bandwidth for active VSWR<3.
Key words : tightly coupled array antenna；ultra-wideband；coupler