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摘要随着现代无线通信系统的飞速发展，频谱拥挤的矛盾日益突出。为了提高频谱资源的利用率，多通带、扩跳频和动态频率分配等频谱技术得到广泛应用，这大大促进了快速电调或电可重构滤波器的发展。在军事通信系统中，为了满足抗干扰需求，适应快速跳频的微波电调滤波器应用也越来越广泛。64906
本文在微带双模滤波器的理论基础上，研究了微带电调滤波器的设计。主要工作可以分为以下三部分：
一、总结了电调滤波器的发展情况和一些研究结果；
二、学习了微带线和二端口网络的一部分基础理论知识，为下面的设计工作打下基础；
三、研究了微带双模可调滤波器的设计，电调的实现方式是在微带谐振器的终端加载变容管的方式实现的。
基于上面的理论，采用三维电磁仿真软件Ansoft HFSS. 12和 ADS 电路仿真软件进行联合仿真，实现快速准确的设计，并进行仿真校验。
毕业论文关键词： 微带滤波器 双模谐振器 变容二极管 可调滤波器
毕业设计说明书（论文）外文摘要
Title Design of the microstrip tunable filter
Abstract Along with the rapid development of modern wireless communication systems，frequency spectrum has become more and more crowded. In order to improve the usage of frequency spectrum, the spectrum technologies such as multi-band, hopping frequency, spread spectrum and dynamic frequency allocation have been widely used, which has greatly promoted the development of fast electrically tunable or configurable filters. In military communication systems, to meet the requirement of anti-jamming microwave electrically tunable filters are applied for fast frequency hopping.
In this paper, based on the theory of microstrip dual-mode filter, A microstrip varactor-tuned filter has been desiged. The main work can be pided into the following three parts:
1. Summed up the development of electric tunable filter and some research results;
2. Learned the theory of microstrip line and the two-port network ,which lays the foundation for the rest design of this paper;
3. A microstrip dual-mode varactor-tuned filter is studied and presented. The center frequency of the pass-band tunable is fabricated by loading varactors in the microstrip resonator terminal.
Based on the proposed method, co-simulation is made by implementing tools like HFSS and ADS for fast and accurate design.
Keywords: Microstrip filter Dual-mode resonator Varactor diodes Tunable filter
目 次
1 绪论 1
1.1微波滤波器的发展历史 1
1.2可调滤波器的研究概述 1
1.2.1研究背景 1
1.2.2 指标 2
1.2.3 分类 2
1.3本文的内容安排 5
2 微带和滤波器基础理论 6
2.1传输线理论 6
2.1.1 均匀传输线的模型和概念 6
2.1.2均匀传输线的特性参数 7
2.2微带传输线理论 9
2.2.1微带线的结构 10
2.2.2 微带传输线的特征参数