摘要随着无线通信技术的发展, 通信终端的发展越来越趋于小型化、多功能化、多频带、多极化、多用途。该天线由两部分构成,分别馈电, 上层采用单馈电方式，并用U型缝来扩展带宽和实现天线的小型化，下层采用双馈电方式，利用馈电网络产生相位差为90°的信号的方式来得到圆极化波，由于上层天线的影响，拓展了天线的工作带宽，实现了无线通信中天线的小型化和多频段的要求，可以使得天线系统做到紧凑、经济和有利于小型化。对其进行了仿真和测试, 结果表明该天线可工作于1.615GHz，2.492GHz频段, 调试方便，覆盖频段较宽，增益较高，尺寸较小。天线两个单元的隔离程度取决于结构和激励，其隔离度为-30dB。两个天线选取圆极化的工作模式，增大频段之间的隔离度，性能较好 。63659

毕业论文关键词  多频  单馈电  双馈电   圆极化  小型化

Abstract

With the development of wireless communication technology, the development of the communication terminal tends to be miniaturization, multi-functional, multiband, multi-polarization and multipurpose more and more. The antenna consists of two parts that feed respectively. The upper adopts single feed method, and it is implemented in a u-shaped slot to expand bandwidth and antenna’s miniaturization. The lower adopts double feeding method, phase difference of 90 ° signal generated by feed network .The upper antenna expands the bandwidth antennas work, implements the wireless communications antenna miniaturization and multiband requirements, can make the antenna system more compact, the economy and is beneficial to miniaturization. On the simulation and test, the results show that the antenna can work at 1.615 GHz and 2.492 GHz frequency band, and debug is convenient, wide cover band, high gain, small size. Two frequency antenna’s isolation depends on the structure and incentives, it can be -30dB. In both the operation mode of the circular polarization antenna selection, increasing frequency band, make the isolation between the two part better. 

Keywords： Multi-frequency   single- feed   dual-feed   circularly polarized     miniaturization

目录

1. 绪论 1

1.1 Ansoft HFSS高频仿真软件的介绍 1

1.2 本文的主要工作与内容安排 1

2. 微带天线的基本概念和发展现状 2

2.1 微带线概述 2

2.2 微带天线的电参数 3

2.3 微带天线的馈电方式 4

2.4 微带线的性能 4

2.5 微带天线的研究趋势 5

2.6 多频微带天线的研究 6

3. 圆极化微带天线 6

3.1 圆极化微带天线的性能 6

3.2 圆极化微带天线的馈电方式 7

3.2.1 单点馈电 8

3.2.2