Wideband circular-polarized transmitarray for generating a high-purity vortex beam  

作　　者：Liangjie QIU Xiuping LI Zihang QI Wenyu ZHAO Yuhan HUANG 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing 100876,China [2]MOE Key Laboratory of Universal Wireless Communications,Beijing 100876,China [3]Beijing Key Laboratory of Work Safety Intelligent Monitoring,Beijing 100876,China [4]School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China [5]Beijing Institute of Spacecraft System Engineering,Beijing 100094,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2023年第6期927-934,共8页信息与电子工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61971051)。

摘　　要：In this correspondence,a wideband circular-polarized(CP)transmitarray(TA)in the Ka-band is presented for generating a high-purity vortex beam.The proposed element is composed of two identical combinations separated by an air layer.The subwavelength structure and double-resonance characteristics ensure the stable phase shift of the element within the 1-dB transmission bandwidth of 28.4%.A square aperture TA fed by a horn antenna is fabricated and measured.Owing to the honeycomb arrangement of elements,the mode purity of l=−1 is>0.93 in a wide band from 28.5 to 38 GHz.The measured peak gain is 22.3 dBic,and the 3-dB axial ratio bandwidth is 27.6%.The performance of the proposed antenna demonstrates its potential for high-capacity wireless communication and high-quality radar imaging.

关 键 词：antenna GENERATING CIRCULAR 

分 类 号：TN822[电子电信—信息与通信工程]