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摘要MIMO技术是新一代通信系统的关键技术，将MIMO技术应用于雷达领域是一种全新的尝试并具有广阔的发展前景。
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共形天线因其能够在不破坏载体机械结构的基础上节约载体空间，已经成为国内外研究的热点。
文章在研究微带天线相关理论的基础上，设计了一款工作在5GHz的MIMO雷达共形天线，并利用电磁仿真软件对设计进行了仿真和优化。文章首先对天线的辐射单元进行了设计仿真。相较于一端馈电形式，中间馈电形式的串馈阵能够增加天线的增益，降低天线的副瓣电平，但同时也导致了馈电点两边相位不相等。文章随后设计了带180°相移的功分器，并在此基础上设计了微带共形串馈阵。最后，对天线阵列之间的耦合进行了仿真分析，结果表明天线间的耦合度在-40dB以下，对MIMO天线的总体性能影响很小。27658
关键字：MIMO，微带天线，共形天线，电磁仿真，耦合
毕业论文设计说明书外文摘要
Title The Design of MIMO Radar Antenna
Abstract
MIMO (Multiple-Input Multiple-Output) is the key technology of a new generation of communication system, MIMO applied to radar filed is a new attempt and has a great potential for further application.
Being able to save space without destroying mechanical structures of the carrier, conformal antenna has become a hit among the research field.
Base on the relevant micro-strip antenna theory, a 5GHz MIMO radar conformal antenna is designed in the paper, which is simulated and optimized on electromagnetic simulation software. Firstly, the radiating elements of the antenna is designed and simulated. Compared with the single-end fed array, intermediate fed array can increase antenna gain, and reduce the side-lobe level, but the phases are not equal on both sides. Then, a 180 ° phase shift of power is designed, and based on which a micro-strip conformal array is also introduced in the paper. At the end of the paper, the coupling between the antenna arrays is simulated and analyzed. As is indicated in the paper that when coupling between antennas is less than -40dB, its impact on the performance of MIMO antenna is relatively small.
Key Words: MIMO, Micro-strip antenna, conformal antenna, electromagnetic simulation, coupling
目 次
1 绪论 1
1.1 课题背景 1
1.2 课题研究现状 1
1.3 论文主要内容及章节安排 1
2 辐射单元设计 3
2.1 微带贴片天线 3
2.1.1 微带贴片天线的结构 3
2.1.2 微带贴片天线的馈电方式 3
2.1.3 微带贴片天线的分析方法 5
2.2 微带辐射单元尺寸计算 6
2.3 微带辐射单元仿真结果及分析 7
2.3.1 以FR4_epoxy为基板的微带辐射单元 7
2.3.2 以RT/duroid5880为基板的微带辐射单元 8
2.3.3 两种设计方案的分析与比较 9
3 微带共形串馈阵设计 10
3.1 微带阵列天线的相关原理 10
3.1.1 方向图乘积定理 10
3.1.2 微带驻波阵 12
3.1.3 微带行波阵 12
3.1.4 微带天线的馈电方法 13
3.2 微带共形天线的相关原理 14
3.3 功分器的相关原理 16
3.4 微带共形串馈阵仿真结果及分析 18