摘要随着无线通信产业的蓬勃发展，需要在有限的频率范围内划分出更多的频段，以满足多种通信业务的需求，而滤波器作为一种选频器件，其性能的优劣对整个系统的通信质量有着至关重要的影响。近年来随着短距离无线通信技术快速发展，使宽带技术备受关注，因此，开展宽带滤波器的研究也具有非常重要的意义。64919

目前，宽带滤波器在实现滤波器带宽需求的同时，小型化以及带外抑制特性还有待进一步提高。采用信号干扰的概念设计宽带滤波器结构，具有理论设计简单、选择性高、结构紧凑等优点，因此本文主要研究基于信号干扰技术的高选择性宽带滤波器。 

本论文首先对宽带滤波器的国内外研究现状做了分析、总结和归纳，并对其进行了优缺点的比较，然后介绍了微波滤波器的参数指标和设计方法，并深入研究了平行耦合结构及其参数矩阵，最后介绍了信号干扰的基本理论和简化的电路模型，并采用平行耦合结构线设计了一个基于信号干扰技术的宽带带通滤波器，对其进行了理论分析、电路仿真。实验结果与仿真结果吻合较好，验证了设计思路的有效性。

毕业论文关键词  宽带技术，宽带滤波器，平行耦合线，信号干扰技术

毕业设计说明书（论文）外文摘要

Title    High selectivity wideband filter based on signal- interference  concept                                          

Abstract With the rapid development of wireless communication industry, the limited frequency spectrum is required to pide into more bands to meet the needs of a variety of communication services. As a frequency-selective device, the filter is essential to the performance of the communication system. In recent years, the wideband technology has received a lot of attention due to the short-range wireless communications. Therefore, the research on wideband filter has a very important significance.

Recently, with the implementation of the filter bandwidth requirements, wideband filter also develops toward miniaturization and wide band rejection performance. The design of wideband filter using signal-interference concept has a lot of advantages, such as simple design, high selectivity and compact structure, etc. The research in this thesis is focused on the high-selectivity wideband filter based on signal-interference concept.

In this thesis, the current research of wideband filter around the world has been reviewed and analyzed firstly. Different methods to design wideband filters have also been compared with each other. Then, the microwave filter performance indexs and design methods are proposed. Intense research for the parallel coupled line structure and its parameter matrix has been given. Finally, the basic theory of signal-interference and its simplified circuit model have been analyzed. And a wideband filter based on signal-interference using parallel coupled line has been designed, analyzed and simulated. Good agreement between the simulation and measurement has been observed, indicating the validity of the proposed design strategies.

Keywords  wideband technology, wideband filter, parallel coupled line, signal-interference technology

目   次

1 绪论    1

1.1 课题研究背景   1

1.2 国内外研究现状   1

1.2.1 平面宽带滤波器的研究现状  .. 1

1.2.2 信号干扰技术在滤波器中的应用. 3

1.3 本文的主要工作和章节安排 . 5

2 滤波器基本理论  6

2.1 滤波器的功能和基本类型 .. 6

2.2 滤波器主要设计指标 . 6