摘要：定向耦合器具有结构简单、尺寸小、制造方便等优点，因此得到了较为广泛的应用。本文在对常用的1/4平行线耦合器研究的基础上，研究多节平行耦合线结构。主要工作如下：
采用了多节对称耦合线结构来实现宽频带的定向耦合，使用全波电磁仿真软件HFSS建立模型并进行仿真，通过对多节对称定向耦合器的各种变量的优化，成功设计出工作于X波段的超宽带定向耦合器，其相对带宽达50%。在工作频段范围内，耦合器的直通端口与耦合端口的能量近乎均等，耦合度在-2.8与-3.5dB之间，隔离度在-13dB与-15.6dB之间，完全达到工程实用性的要求。
关键词 定向耦合器 微波技术 耦合带状线
毕业设计说明书外文摘要
Title The design and optimization of a directional coupler with a wide bandwidth.
Abstract： The directional coupler has the advantages of simple structure, small size, easy manufacture and so on, so it has been widely used. On the basis of the commonly used 1/4 parallel line coupler, this paper studies the multi-section parallel coupling line structure. The main work is as follows:
The multi-section symmetrical coupling line structure is used to realize the directional coupler with the wide bandwidth, and the model is established and simulated by the electromagnetic simulation software HFSS.The variables of the multi-section symmetric directional coupler are optimized.Finally a directional coupler with a wide bandwidth in the X-band whose relative bandwidth is 50% is successfully designed.Besides,the output power of the coupling port and that of the pass through port are almost equal in the working frequency range .The coupling degree is varied in the range of -2.8dB and -3.5dB and the isolation degree is varied in the range of -13dB and -15.6dB ,which fully meets the requirements of engineering practicability.
Keywords directional coupler microwave technology coupled stripline
目 次
1 绪论 1
1.1 研究背景和意义 1
1.2 定向耦合器的概念及分类 1
1.4 本文研究内容及章节安排 5
2 定向耦合器理论 6
2.1与定向耦合器相关的微波网络理论 6
2.2耦合带状线理论 7
2.3多节对称带状线定向耦合器的理论 11
2.4 定向耦合器的基本技术指标 13
3 多节对称定向耦合器的设计与优化 15
3.1多节对称定向耦合器的设计 15
3.2 仿真模型建立 16
3.3仿真优化设计过程与分析 17
4 总结与展望 34
4.1 总结 34
4.2 展望 34
致 谢 36
参考文献 37
1 绪论
1.1 研究背景和意义
电磁波在微波频段是可以穿透电离层的，所以微波技术在军事应用领域、通信领域等占据着非常重要的地位。定向耦合器是一种功率耦合元件，可以实现功率分配。所以在微波传输系统中，定向耦合器是一个不可或缺的元器件。 宽频带定向藕合器的设计与优化:http://www.chuibin.com/tongxin/lunwen_205972.html