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随着无线通信技术的迅速发展，传统三文结构的天线已经不能满足应用要求，小型化，易集成的平面天线越来越重要。缝隙天线是一种典型的平面天线，具有低剖面,易集成,方便组阵等特点。如果形状、长度、介质厚度和介电常数选择合适的话，缝隙天线可以在很宽的频带上产生对称波束（包括E面和H面），并且具有高的增益和低的副瓣。
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本文主要以直线渐变缝隙天线为研究对象，详细给出了直线渐变缝隙天线结构参数的设计过程，并且在电磁仿真软件HFSS中建立模型，用鳍线和微带线两种馈电方式给渐变缝隙天线馈电，根据得到的仿真结果，利用电磁仿真软件HFSS中的参数化扫描进行优化分析，最终得到了满足设计要求的结果。27028
关键词 缝隙天线 HFSS软件 鳍线和微带线馈电 优化设计
毕业设计说明书外文摘要
Title Design and Simulation of Tapered Slot Antennas
Abstract
With the development of wireless communication techniques, traditional antennas of 3D structure can’t adapt for the application any more. Tiny and easy-integrated planar antennas are increasingly important. Slot antenna is a typical planar antenna with low-profile, which is able to make antenna arrays. Provided that parameters such as shape, total length, dielectric thickness, and dielectric constant are chosen correctly, slot antennas can produce a symmetric beam (in E and H planes) over a wide band of frequencies. Besides，slot antennas have moderately high directivity and low side-lobes.
Linear tapered slot antennas are mainly studied in this paper. Processes of designing linear tapered slot antennas are discussed in details. 3D models are built up in software HFSS. The linear tapered slot antennas are fed by finlines and striplines. Simulation results are well analyzed and properly optimized with the help of optimetrics in HFSS. Finally, linear tapered slot antenna with best properties is designed and presented.
Keywords slot antennas HFSS finlines and striplines fed optimized design
目次
1 绪论 1
1.1天线概述 1
1.2缝隙天线简介 2
1.2.1发展历史和研究现状 2
1.2.2缝隙天线的特点和应用 5
1.3 HFSS软件简介 5
1.4本论文的安排 6
2 天线的基本参数 8
2.1方向图 8
2.2方向系数和增益 10
2.3阻抗特性 12
2.4极化特性 13
3 渐变缝隙天线 15
3.1渐变缝隙天线的结构和分类 15
3.2渐变缝隙天线等效模型 16
3.2.1馈电结构 16
3.2.2辐射缝隙结构 20
3.3渐变缝隙天线参数 21
4 渐变缝隙天线设计与仿真 22
4.1设计要求和参数选取 22
4.1.1设计要求 22
4.1.2参数选取 22
4.2 鳍线馈电渐变缝隙天线 22
4.2.1 HFSS软件建模 22
4.2.2仿真结果分析 23
4.2.3仿真结果优化 24
4.3微带馈电渐变缝隙天线 26
4.3.1 微带馈电结构设计 26
4.3.2仿真结果分析 28
4.3.3仿真结果优化 29
结论 33
致谢 34