面向5G 多波束应用的紧凑宽带Rotman透镜设计  

Design of compact wideband Rotman lens for 5G multibeam application

作　　者：付宇璠 周东方 张毅[1] 吕大龙 张德伟 许飞[2] Fu Yufan;Zhou Dongfang;Zhang Yi;LüDalong;Zhang Dewei;Xu Fei(PLA Strategic Support Force Information Engineering University,Zhenzhou 450001,China;PLA 31437 Force,Shenyang 110000,China)

机构地区：[1]战略支援部队信息工程大学信息系统工程学院,郑州450001 [2]中国人民解放军31437部队,沈阳110000

出　　处：《强激光与粒子束》2021年第3期53-58,共6页High Power Laser and Particle Beams

基　　金：核高基重大专项(2013ZX01010003-004)。

摘　　要：提出了一种基于等光程差原理设计的紧凑宽带Rotman透镜波束赋形网络,用于5G毫米波通信的天线阵列多波束实现。首先,详细介绍了Rotman透镜的基本原理;然后,利用二等分功分器替代传统的单端口馈电模式,产生高定向波束,降低相邻端口处的能量损失以及透镜内部能量的散射;最后利用切比雪夫多枝节匹配变换器,优化原有的锥形阵列输出端口,在保证宽频带的条件下,缩短原有匹配端口尺寸,使得透镜整体尺寸减少20%,实现了Rotman透镜的紧凑性。改进模型的实测结果表明,该透镜工作频带为16.5~33.8 GHz,其中在17.2~32 GHz,S11优于15 dB,扫描角度为±30°。该透镜结构简单紧凑,能够有效地为相邻阵元提供稳定的相位差信号,很好地实现5G毫米波阵列多波束的目标。In this paper, a compact broadband Rotman lens beamforming network based on equal optical path difference is proposed. The beamforming network is intended for applications in a multi-beam antenna array of 5G millimeter-wave(mm-wave) communication. Firstly, the theoretical design of the Rotman lens is introduced in detail.A power divider is used to replace the standard single-port feeding mode to generate a high-directional beam, reducing the scattering of the lens’ internal energy and the energy loss at adjacent ports. The Chebyshev multi-stub matching converter is used to optimize the original tapered array output port. To ensure a wide frequency band, the original matching port size is reduced, and the overall size of the lens is reduced by 20%. Measurement results of the improved model, show that the working frequency band of the lens is 16.5-33.8 GHz, of which S11 is better than 15 dB at17.2-32.0 GHz, and the scanning angle is ±30°. The lens has a simple and compact structure, can effectively provide a stable phase difference signal for adjacent array elements, and achieve the goal of 5G millimeter-wave array multibeam.

关 键 词：ROTMAN透镜 宽带 多波束 毫米波 阵列 

分 类 号：TN822[电子电信—信息与通信工程]