摘要右旋圆极化微带天线是导航系统用户端中的一个关键组成部分。考虑到终端设备的便携性，在天线设计时应尽量减小天线的尺寸来实现天线的小型化。

  本文中天线采用切角结构，同轴馈电方式，通过改变贴片的尺寸调整中心频点的位置，通过调节切角的大小和馈电点的位置实现天线的右旋圆极化。并采用高介电常数的介质板来达到天线小型化的要求。本文利用Ansoft HFSS三维电磁仿真软件给出了天线的详细设计过程，采用变量设置，参数扫描等方法快捷有效的选择确定天线的各物理参数指标，并对实验仿真结果进行分析讨论，证明了设计的可行性。本文还加工制作了天线实物，并采用矢量网络分析仪对天线实物进行性能测定，仿真结果与测试结果基本吻合，天线性能良好，满足接收天线设计要求。此外，本文焊接并测试了一个低噪声放大电路。该放大器是一个小尺寸的两级低噪声放大器。芯片选用的是型号为MAX2659的低噪放芯片。61675

毕业论文关键词  微带天线  圆极化  小型化  低噪放大电路

毕业设计说明书（论文）外文摘要

Title   Study on active and miniaturization of Beidou navigation antenna design                      

Abstract In the design of the BeiDou receiver, the right-hand circular polarized antenna is one of the key components. Taking into account the requirements of portable terminal equipment, dimensions of designed antenna should be as small as possible.

In this paper, Circularly polarized (CP) radiation of micro-strip antenna could be achieved by using a single coaxial probe feed at the diagonal line of the patch and truncating corners. Besides, this paper adjusted the center frequency by changing the size of the patch. In this paper, high dielectric constant materials were used to achieve the miniaturization of micro-strip antennas. This paper used Ansoft HFSS---electromagnetic simulation software to design antenna and give the details of experimental results, simultaneously proved the feasibility of the design. This article also manufactured the antenna physical. And it measured the performance of the antenna physical by using a vector network analyzer .Simulation results and test results were basically consistent. It met the design requirements of receiving antenna. In addition, it designed and tested a low-noise amplifier. The amplifier had a small size and it is two-stage-chip. It selected the MAX2659 which is a low noise amplifier chip.

 Keywords  micros-trip antenna  circular polarization  miniaturization            low-noise amplifier

1  绪论 2

1.1  课题研究背景 2

1.2  卫星导航系统终端天线的研究现状 2

1.3  本文主要工作 3

2  微带天线的基本理论 3

2.1  微带天线的定义和结构 3

2.2  微带天线的辐射机理 4

2.3  微带天线的分析方法 5

2.3.1  传输线模型法 5

2.3.2 空腔模型法 8

2.3.3 积分方程法 8

2.4  微带天线的小型化 9

2.5  微带线的馈电方式 12

2.5.1  微带馈电 13