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摘要微带天线以其重量轻、成本低、剖面薄、设计灵活等诸多优点，无论在军事还是民用领域都有着广泛的应用。和其他天线类似，微带天线最初被应用于军事领域，主要用于导弹制导、引信、雷达等。低副瓣微带天线具有出色的电子对抗能力，而毫米波在雾、雪、尘埃等环境中具有良好的传播特性，因此对毫米波低副瓣微带天线的深入研究具有重要的国防意义和工程价值
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本论文为降低毫米波微带阵列天线的副瓣水平，提出了一种新型并馈中心嵌入式贴片天线阵。利用Ansoft HFSS软件仿真设计了一个1×4毫米波段平面微带天线阵。通过分析毫米波段内阻抗变换段与传输线间的不连续，采用并馈网络，确定了馈线与输入阻抗、谐振频率的关系。通过优化馈线与阻抗变换段的宽度与长度以实现谐振频率和阻抗匹配的调整。19422
关键词：ka波段 微带天线 低副瓣 功分器
毕业设计说明书（论文）外文摘要
Title: The Low Sidelobe Microstrip Antenna Array Designed for Radar
Abstract
Microstrip antennas have been used in many applications in the military and civilian fields due to their inherent advantages like light weight, low cost ,thin profile , flexible design and so on . And similar to other antennas, microstrip antenna was originally used in the military field, mainly for missile guidance, fuse and radar. Low sidelobe microstrip antenna with excellent electronic warfare capabilities and with the same time , millimeter wave has good propagation characteristics in fog, snow, dust and other environments,and therefore has important implications for defense in depth study of millimeter-band low sidelobe microstrip antenna and the value of work.
In this paper, to reduce the side-lobe level of millimeter-wave microstrip array antenna, propose a novel embedded patch antenna array fed center. Use Ansoft HFSS simulation software to design a 1 × 4 millimeter band planar microstrip antenna array. Through the analysis of discontinuous segments within the millimeter wave band impedance transformation between the transmission line, using a new type of string and feed-forward network, determine the input impedance of the feeder and the relationship between the resonant frequency. By optimizing the width and length of the feeder and the impedance transformation stage in order to achieve adjust the resonant frequency and impedance matching ,by optimizing the width and length of the feeder and the impedance transformation stage in order to achieve adjust the resonant frequency and impedance matching in order to get in line with the performance of low sidelobe microstrip antenna.
Keywords : ka-band low sidelobe Microstrip antenna Splitter
目录
摘要 I
Abstract..II
目录..III
第一章 绪论 1
1.1研究背景 1
1.2毫米波微带天线发展 2
1.3.阵列天线的设计步骤 4
1.4设计时考虑的因素 4
1.5本文的内容安排 5
第二章 微带天线基本理论 6
2.1.微带贴片天线的结构6
2.2.微带贴片天线的分析方法6
第三章 微带阵列馈电基本理论 9
3.1.微带天线单元的馈电方式 9
3.2微带天线阵的馈电方式10
3.3微带T型功分器11
第四章 阵列天线基本原理 13
4.1引言13
4.2 微带线阵的辐射特性 13
4.3微带面阵的辐射特性16
4.4实现天线低副瓣的方法17