摘要随着无线通信技术的飞速发展，对天线的要求也越来越高。移动终端设备的发展趋势越来越小型化、低损耗、以及多功能，而微带天线由于其结构紧凑、体积小、重量轻等诸多优点，能够很好的满足移动通信系统对于终端天线性能的要求，因而在各方面都得到了非常广泛的应用。60087

    根据远距离射频识别系统对天线的要求，本文首先介绍了微带天线的基本理论和近年来的发展状况；其次深入地阐述了微带天线设计的基本步骤，并通过计算来确定天线的尺寸，而且在加入馈电、匹配等条件后，根据实用性设计了一款工作于5.8GHz的侧馈矩形微带天线；接着，使用高频仿真软件HFSS，对设计出的天线结构进行建模处理，观察入射端反射系数 ，谐振频率和天线增益；最后，根据得到数据来对天线进行优化，进行扫描后选取贴片的尺寸、阻抗转换器设置的最佳数值，最终达到要求。

关键词  微带天线 高频仿真软件 仿真 优化

毕业设计说明书（毕业论文）外文摘要

Title    Design and Simulation of microstrip antenna        

Abstract

With the rapid development of wireless communication,the demands for antennas are increased greatly.Mobile terminal device tends to be smaller ,low-loss,and multi-functional.Microstrip antennas which are used widely  in all aspects can meet the requirements of the mobile communic-

ation system for terminal antenna performance due to its compact structure,small volume,light weight etc.

     According to the requirements of the antenna of the RFID system, this paper introduces the basic theory of microstrip antenna and the development condition in recent years at first.Then, further describes the basic steps of microstrip antenna and determines the size of the antenna through by calculation ，then after adding the  condition of feeding and matching, auther designs the side fed rectangular microstrip antenna which works at 5.8GHz side according to the practicality.Then，based on the high frequency simulation software，modeling the designed antenna structure，observe the incidence end reflection coefficient  , the resonant frequency and the antenna gain.Finally, according to the obtained data optimize the antenna .After scanning selects the best numerical patch size, the optimum value of impedance converter to meet  the requirements.

Keywords  Microstrip antenna;HFSS;simulation;optimize

目  录

1  绪论 1

1.1  微带天线的发展及现状 1

1.2  5.8Ghz的选取原因与优缺点 2

1.3 设计目标 3

2  微带天线的基本原理 4

2.1  微带天线的基本原理 4

2.2  微带天线的分析方法 6

2.2.1  传输线法 6

2.2.2  空腔理论 8

2.2.3  多端口网络模型 9

2.2.4 数值分析方法 10

3  微带天线的设计 13

3.1  初始尺寸的设计 13

3.1.1 介质基板的选取 13

3.1.2  单元宽度的选择 14

3.1.3  单元长度的确定 15

3.2  馈电与匹配