(完整版)双频单极子天线毕业设计

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。本篇论文主要设计与仿真射频双频单极子天线。

半波偶极子天线和单极子天线是迄今为止应用较为广泛的天线。利用镜像原理，引入接地面可以将半波偶极子天线的长度减少一半，即1/4波长单极子天线。

然后，文中设计并仿真了一个单极子天线，能够使用在无线局域网中。其L 型单极子天线由微带线直接馈电，天线工作于IEEE802.11a和802.11b两个工作频段，实现了天线的双频工作特性。仿真结果表明，该天线低频单极子天线垂直方向长度等于19mm时，该单极子天线的双频振

点，也就是高频振点对应IEEE802.11a （5.15GHz~5.825GHz），低频振点对应IEEE802.11b （2.4GHz~2.4825GHz），能够应用在无线局域网所涉及到到相关频段力，同时具备较佳的辐射方向图性质。

关键词：双频单极子；射频； WLAN； HFSS

Design of Radio-Frequency

Monopole Antenna

ABSTRACT

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.

Keywords:dual-band monopole; RF; WLAN; HFSS

目录

摘要 .......................................................................................................................... ABSTRACT ....................................................................................................................第1章绪论 ..................................................................................................................

1.1本论文的研究背景 ............................................................................................

1.2课题意义 ............................................................................................................

1.3双频天线研究现状 ............................................................................................

1.4天线设计中的软件介绍....................................................................................

1.5印刷天线与微带天线的差异............................................................................

1.6本论文主要工作及内容安排............................................................................第2章射频双频单极子天线相关理论........................................................................

2.1天线的概述 ........................................................................................................

2.2天线的电参数 ....................................................................................................

2.3半波偶极子天线 ................................................................................................

2.4单极子天线 ........................................................................................................

2.5印刷天线 ............................................................................................................

2.6双频天线技术概述 ............................................................................................

2.7双频天线采用单一贴片的实现方法................................................................第3章射频双频单极子天线设计与仿真....................................................................

3.1.双频单极子天线的结构....................................................................................

3.2天线初始尺寸和HFSS设计概述 ...................................................................

3.3HFSS仿真设计 .................................................................................................

3.3.1添加和定义设计变量.............................................................................

3.3.2添加新的介质材料 .................................................................................