单脊波导脊边菱形缝隙天线的研究  

Study on Rhombic Slot Antenna at Ridge Edge of Single Ridge Waveguide

作　　者：李春萌 陈小强[1,2] 王英 Li Chunmeng;Chen Xiaoqiang;Wang Ying(School of Automation&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Key Laboratory of Opto-Technology and Intelligent Control,Ministry of Education,Lanzhou,Gansu 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070 [2]光电技术与智能控制教育部重点实验室,甘肃兰州730070

出　　处：《激光与光电子学进展》2021年第5期235-244,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51767013,51867012);甘肃省科技厅自然科学基金(18JR3RA111);甘肃省教育厅自然科学基金(2019B049)。

摘　　要：针对传统矩形波导窄边斜缝天线交叉极化电平高的问题,设计了一种高辐射效率的单脊波导脊边菱形缝隙天线。采用理论分析与电磁仿真相结合的方法研究了波导窄边与宽边比、脊深与波导窄边比、脊边宽与波导宽边比、波导宽边对缝隙谐振的影响。结果表明,波导窄边与宽边比、脊深与波导窄边比发生变化时均会使谐振切深发生相反变化、谐振电导发生相同变化;波导宽边发生变化时会使谐振切深、谐振电导发生相反变化;脊边宽与波导宽边比发生变化时会使谐振切深、谐振电导发生相同变化。根据波导几何参数对缝隙谐振的影响规律优化波导的几何参数,设计了一种16元单脊波导脊边缝隙线阵。缝隙采用菱形排列方式降低交叉极化电平,增益为18.02 dB,副瓣电平低于-19.64 dB,交叉极化电平低于-46.51 dB。与传统矩形波导窄边缝隙天线相比,该天线具有质量轻、交叉极化电平低的优点。Aiming at the problem of high cross polarization level of traditional rectangular waveguide narrow edge inclined slot antenna,a rhombic slot antenna at ridge edge of single ridge waveguide with high radiation efficiency is designed in this paper. The effects of the ratio of waveguide narrow side to the wide side,the ratio of ridge depth to the waveguide narrow side,the ratio of ridge edge width to waveguide wide side,and the width side of the waveguide on the slot resonance are studied by the method of theoretical analysis and electromagnetic simulation. The results show that when the ratio of the narrow side to the wide side of the waveguide and the ratio of the ridge depth to the narrow side of the waveguide changes,the resonant cutting depth change in the opposite direction,and the resonance conductance change in the same direction;when the ratio of the wide side of the waveguide changes,the resonant cutting depth and the resonant conductance change in the opposite direction;when the ratio of the ridge edge width to the wide side of the waveguide changes,the resonant cutting depth and the resonant conductance change in the same direction. According to the influence law of waveguide geometric parameters on slot resonance,the optimal waveguide geometric parameters are selected,and a 16 element single ridge waveguide ridge edge slot array is designed. The slot is arranged in rhombic shape to reduce the cross polarization level. The gain is 18. 02 dB,the side lobe level is lower than-19. 64 dB,and the cross polarization level is lower than-46. 51 dB. Compared with the traditional rectangular waveguide narrow edge slot antenna,the antenna has the advantages of light weight,low cross polarization level.

关 键 词：光学器件 单脊波导 缝隙天线 缝隙谐振 低交叉极化 

分 类 号：TN823[电子电信—信息与通信工程]