1、 空气贴片微带天线的设计空气贴片微带天线的设计 摘摘 要要 微带天线的发展正方兴未艾,应用前景非常广泛。由于应用的需要,微带天线 在许多方面还将得到进一步的发展,如天线介质材料的更新,天线的多极化技术, 分形技术,光子带隙技术以及计算机辅助设计技术和计算机辅助制造技术等.随着 技术的发展以及人们对微带天线的深入研究和探讨,微带天线将会得到更为广泛 的用。 本文着重点是,设计了一款可用于 UHF 频段(915MHz)圆极化微带天线。 采用双层介质微带贴片展宽天线频带。 设计适用于 UHF 频段的微带圆极化天线。 要求体积小,增益高。具体指标如下: 1工作频率:902-928MHz;2增益:大 于
2、 5dBi; 3驻波比:小于 2.0;4极化方式:圆极化,并利用 Ansoft 软件进行仿 真设计。 关键词:关键词:微带天线;Ansoft 软件;圆极化 The Air Microstrip Patch Antenna Design Abstract Abstract The development of the microstrip antenna is in the ascendant and also it has very broad application prospects. Since the request of the application, the microtstri
3、p will be further developed in many ways, for example update the material of the dielectric antenna, Multi-polarization technology, fractal technology, photonic band gap (PBG) as well as computer aided design (CAD) technology and computer aided manufacturing (CAM) technology, etc. With the developme
4、nt of technology and the in-depth study and discussion of the microstrip antenna, it will be more widely used. In this article, emphasis is to design a circularly polarized microstrip antenna that can be used in UHF (915MHz) band. Double-layer dielectric microstrip can be used to broaden antenna ban
5、dwidth. Microstrip circular polarized antenna is designed for use in the UNF band. It requests small in size, high-gain. Specific indicators are as follows, 1Operating frequency: 902-928MHz; 2Gain: greater than 5dBi; 3 VSWR: less than 2.0; 4Polarization mode: circular polarization also it has to be
6、simulated by Ansoft software. Key Words:Microstrip Antenna;Ansoft Software;Circularly Polarization III 目目 录录 1 绪论绪论 1 1.1 课题研究背景及意义 1 1.2 微带天线技术概述 1 1.3 本文主要研究工作 2 2 微带天线微带天线 3 2.1 微带天线研究现状 3 2.1.1 微带天线的发展近况. 3 2.1.2 天线设计的主要工作. 4 2.2 微带天线特点 4 2.2.1 优点. 5 2.2.2 缺点. 5 2.3 天线的参数 5 2.3.1 方向性. 5 2.3.2 方向图. 6 2.3.3 天线效率. 6 2.3.4 增益系数. 7 2.3.5 天线的极化. 7 2.3.6 频带的宽度. 8 2.3.7 天线的输入阻抗和驻波比. 8 2.3.8 参数. 8 2.4 微带天线的馈电方法 9 2.5 典型的微带天线和贴片材料 9 2.5.1 微带天线的基本类型. 9 2.5.2 矩形微带天线. 9 2.5.3 圆极化标签天线. 10 2