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三频小型圆极化微带天线的研究

时间:2017-05-07 19:20来源:毕业论文
设计了一种叠层三频圆极化天线。此天线工作在B3(1.268GHz)、L(1.615GHz)、S(2.491GHz)三个波段上,天线尺寸是44mm*44mm*15mm,使用三层介质板叠加而成

摘  要 近年来,由于无线通信系统向着大容量﹑多功能﹑智能化的趋势飞速发展,天线作为无线通信系统不可缺少的一部分也在向着小型化﹑多频化的趋势发展。本文研究的重点就是多频小型化微带天线。并采用理论分析﹑数值仿真和实验验证的方式对它们进行了研究。本文的研究工作主要分以下两个部分: 首先,本文对于微带天线相关的基本理论进行了阐释,大致说明了一个基本微带贴片天线分析方法、设计原理及电参数。然后对于天线的圆极化、小型化、多频化技术理论进行了概述。 其次,本文在天线圆极化、小型化、多频化技术理论的基础上,设计了一种叠层三频圆极化天线。此天线工作在B3 (1.268GHz)、 L (1.615GHz)、 S(2.491GHz)三个波段上,天线尺寸是 44mm*44mm*15mm,使用三层介质板叠加而成,下面两层是使用单馈切角来形成圆极化,最上一层将使用 U型槽来改善带宽。通过使用 3D 电磁场仿真软件 HFSS13.0 对不同性能天线进行仿真,研究了天线在增益、方向图、驻波、极化轴比等特性方面的不同。8322
关键词:多频带,小型化,圆极化,轴比,增益,微带天线
Abstract
In recent years, with the development of larger capacity, multi-functions and
intelligence communication systems, antenna as an indispensability part of
communication systems is having  the  tendency  to be  multi-frequency and
miniaturization.This dissertation mainly researches the multi-frequency and
miniaturized   microstrip  antennas. Three multi-frequency and miniaturized
microstrip antennas are proposed. Many technologies of them are discussed in theory,
simulation and experiment. the main research work is pided into two parts:
Firstly, this article explains the basic theory for the microstrip antenna, the idea
of  a microstrip patch antenna analysis methods, design principles and electrical
parameters. Then, the circular polarization of the antenna miniaturization,
multi-frequency technology theory are outlined.
Secondly, on the basis of the theory of  the circular polarization of the antenna,
miniaturization, multi-frequency technology    ,  Designing  a laminated three-band
circularly polarized antenna. The proposed antenna can operate at B3,L band and S
band simultaneously, the antenna size is 44mm * 44mm * 15mm, the superposition of
the use of three-layer dielectric slab, the following two layers is to use a single fed
truncated corners  to the formation of circular polarization, the top layer will use the
U-shaped slot to improve the bandwidth. By  using the 3D electromagnetic field
simulation software HFSS13.0 simulation  ,we make a study of the difference of
antenna’s properties such as antenna gain, pattern, standing wave,  axis ratio and so on.  
Key word:, Multi-band,  miniaturization  , circular polarization, axial ratio,
gain,    microstrip antennas
 目录
摘  要. I
1绪论  1
1.1引言  .  1
1.2微带天线的概述  .  2
2微带天线基本理论    3
2.1微带天线的辐射机理  .  3
2.2微带天线的分析方法  .  5
2.2.1 传输线法  .  5
2.2.2 空腔模型  .  6
2.2.3 多端口网络模型  .  6
2.2.4 积分方程法——全波分析法  .  6
2.3  微带贴片天线设计原则及计算公式    9
2.3.1 介质的选择  .  9
2.3.2 线极化微带贴片天线设计步骤  .  10
2.4微带天线的基本电参数  .  11
2.4.1概述    11 三频小型圆极化微带天线的研究:http://www.751com.cn/tongxin/lunwen_6609.html
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