大学毕业论文-双频单极子天线.doc

摘 要 本设计介绍了射频双频单极子天线的基本原理以及基于HFSS的射频双频单极子天线的设计过程。双频天线一个最为简单的颁发就是采用印刷单极子天线来实现，这类天线所需成本极低，而且结构和加工都极为简易，是目前为止众多学者的研究方向HFSS Design of Radio-Frequency Monopole Antenna ABSTRACT 窗体顶端 窗体顶端 This design introduces the basic principles of radio dual-band monopole antenna and a dual-band radio-based HFSS monopole antenna design process. Printed monopole antenna as a dual-band antenna in the form of a simple structure, easy processing, low cost, is also a hot topic in the antenna field. In this thesis, dual-band monopole antenna RF. The use of image theory, the introduction of ground plane can reduce the length of the half-wave dipole antenna half, or a quarter-wave monopole antenna. Then, the paper applied to the design and production of a dual-band WLAN printed monopole antenna. The antennaThe L-type monopole microstrip line directly fed antenna operating in the frequency band IEEE802.11a and 802.11b both work to achieve the characteristics. Measured results show that the low-frequency monopole antenna vertical length equal to 19mm, high frequency and low frequency resonance point of the dual-band monopole antenna design were falling IEEE802.11a (5.15GHz ~ 5.825GHz) and IEEE802.11b (2.4GHz ~ 2.4825GHz) work on the band, meet the requirements of WLAN band, and has a good radiation pattern characteristics. 窗体底端 窗体顶端 Keywords: dual-band monopole; RF; WLAN; HFSS 目录 摘 要 II ABSTRACT III 第1章 绪 论 1 1.1本论文的研究背景 1 1.2课题意义 1 1.3双频天线研究现状 2 1.4天线设计中的软件介绍 3 1.5印刷天线与微带天线的差异 4 1.6本论文主要工作及内容安排 4 第2章 射频双频单极子天线相关理论 5 2.1天线的概述 5 2.2天线的电参数 5 2.3半波偶极子天线 8 2.4单极子天线 8 2.5印刷天线 9 2.6双频天线技术概述 10 2.7双频天线采用单一贴片的实现方法 10 第3章 射频双频单极子天线设计与仿真 11 3.1.双频单极子天线的结构 12 3.2 天线初始尺寸和HFSS设计概述 12 3.3 HFSS仿真设计 14 3.3.1添加和定义设计变量 14 3.3.2添加新的介质材料 14 3.3.3设计建模 15 3.3.4设置边界条件 16 3.3.5设置激励方式 16 3.3.6求解设置 17 3.4天线性能结果分析及优化 17 3.4.1仿真设计结果 17 3.4.2参数扫频分析R2对低频段谐振频率的影响 18 3.4.3查看最终优化设计结果 19 第4章 结 论 19 4.1全文总结 19 4.2展 望 20 参考文献 20 致 谢 21 第1章 绪 论 1.1本论文的研究背景 单极子天线十几年发展迅