基于多模谐振器的超宽带滤波器的设计与仿真

摘要

摘要

在2002年2月，美国联邦通信委员会（Federal Communications Committee, FCC）批准将3.1GHz-10.6GHz这一频带作为超宽带通信所用，这一举措对超宽带技术的发展起到了积极的推动作用，并在学术界和工业领域引起了广泛的研究兴趣。超宽带技术解决了困扰传统无线技术多年的有关传播方面的重大难题，它具有对信道衰落不敏感、发射信号功率谱密度低、低截获能力、系统复杂度低、能提供数厘米的定位精度等优点。超宽带滤波器是超宽带通信系统中非常重要的一个器件。根据FCC的技术规范来设计一个具有良好带内及带外特性的超宽带滤波器是一个很大的挑战。

基于微带线的超宽带滤波器受到人们的广泛关注。在微波通信电路中，微带线是应用最为广泛传输线之一，因其具有易于加工、成本低、体积小、可大批量印刷生产等优点而被广泛应用于功分器、滤波器、天线等微波器件的设计加工中。目前人们针对基于微带线的超宽带滤波器开展了相关研究。提出了一些设计方法，例如，基于多模谐振器的设计方法及基于复合开裂环谐振器的方法等等。

本文主要针对基于多模谐振器的超宽带滤波器开展研究。探索了一种多枝节加载的多模谐振器。仿真分析表明，该谐振器具有六个模式。在此基础之上，构造了一个超宽带滤波器。该滤波器能够覆盖3.1~11.0GHz频率范围；通带内的回波损耗为-12dB；带外在14GHz处的抑制可以达到-60dB。

关键词语：滤波器、超宽带（UWB）技术、奇偶模分析法、多模谐振器

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ABSTRACT

ABSTRACT

In 2002 February, the United States Federal Communications Commission (Federal Communications Committee, FCC 3.1GHz-10.6GHz) approved the band as the UWB communication, a move that a positive role to the development of UWB technology, and has attracted much interest in the academic and industrial fields. Ultra wideband technology to solve the problems of traditional wireless technology for many years about the spread of the problem, it is insensitivity to channel fading, low power density, low interception capacity, low complexity of the system, provided a few centimeters accuracy. Ultra-wideband filter is a very important part in UWB communication system. According to the technical specification of FCC to design a good in-band and out-of-band characteristics of UWB filter is a big challenge.

Ultra-wideband filter microstrip line attention based on. In microwave circuits, microstrip transmission line is one of the most widely used, because of its design and processing of easy processing, low cost, small size, can be mass production, and is widely used in power splitter, filters and antennas, microwave devices. At present people for UWB filter based on microstrip lines of research. Put forward some design methods, for example, the design method based on multi-mode resonator based on composite cracking ring resonator method etc..

This paper mainly aims at the research on UWB filter based on multi-mode resonator. Exploration of the multi-mode resonator a stub loaded. Simulation results show that, the resonator has six modes. On this basis, construct a UWB filter. The filter can cover the 3.1~11.0GHz frequency range; through echo loss band for -12dB; inhibition with external 14GHz can reach -60dB.

Key Words: Filter，ultra wideband (UWB) technology, even-odd mode analysis, Multimode resonator

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目录

目录 第1章

引言 ................................................................................................................. 1 1.1 选题背景 ............................................................................................................ 1 1.2 研究目标和意义 ................................................................................................ 1 1.3 研究思路 ............................................................................................................ 1 第2章

微波滤波器网络基础理论 ............................................................................. 2 2.1.1 微波滤波器参数指标 .............................................................................. 2 2.1.2 微波滤波器的分类 .................................................................................. 4 2.2 网络基本理论和微带耦合线节理论 ................................................................ 5

2.2.1 微波滤波器网络散射矩阵 ...................................................................... 5 2.2.2 网络的ABCD矩阵 ................................................................................. 6 2.2.3 微带平面结构 .......................................................................................... 7 2.2.4 微带耦合线节 .......................................................................................... 8 2.3 奇偶模分析方法 ................................................................................................ 9

2.3.1 奇偶模原理 .............................................................................................. 9 2.3.2 奇偶模原理在多模滤波器分析的应用 ................................................. 11

第3章

基于多模谐振器的超宽带滤波器的研究现状 ........................................... 14 3.1.1 阶梯阻抗谐振器的基本特性 ................................................................ 14 3.1.2 基于阶梯阻抗谐振器的多模谐振原理 .............................................. 18 3.2 基于多模谐振器的滤波器模型 ...................................................................... 23 3.3 对滤波器进行对比分析 .................................................................................. 26

3.3.1 通过仿真来得到谐振频率 .................................................................... 26 3.3.2 用奇偶模分析法得出谐振频率 ............................................................ 26 3.4 本章小结 .......................................................................................................... 28 第4章

基于多模谐振器的超宽带滤波器的设计与仿真 ....................................... 29 4.1 概述 .................................................................................................................. 29 4.2 滤波器的初步设计仿真 ....... …… 此处隐藏：5300字，全部文档内容请下载后查看。喜欢就下载吧 ……