摘要近年来，随着国民经济的快速发展和国防科技的飞速进步，航空、航天、雷达系统、单兵智能武器、机载和弹载的无线系统等均对微型微波器件提出了更高的要求。本文研究并设计了4GHZ  LTCC滤波器。66377

本项目以滤波器设计基本理论为指导，采用广义切比雪夫滤波器原型，借鉴同轴谐振腔滤波器设计中得到的规律。滤波器的实现采用4级结构的抽头式梳状线带通滤波器方式。边带陡峭是该滤波器的优点，通过增加滤波器级数来实现，这里用了4个谐振级。滤波器零点的产生是由非相邻谐振器间的交叉耦合以及引入Z字形导体层产生。

所设计的LTCC微型滤波器所达到的性能：尺寸为：3.2mm：×2.5mm×1.5mm, 中心频率：4GHz, 带宽：400MHz, 通带插入损耗：小于2.1dB，通带反射损耗优于17dB，阻带抑制优于32dB。

毕业论文关键词：LTCC，微波滤波器，边带陡峭，带状线。 

Abstract

Recently, with the rapid development of the national economy and the rapid advance of national defense science and technology, aviation, aerospace, radar systems, inpidual soldier intelligent weapons and airborne radio system, etc. Request high performance and miniaturization microwave devices. This paper study and design of 4GHz LTCC filters.

The design is in the guidance of basic filter theory.We employ asymmetric generalized Chebyshev prototype filter and borrow ideas from coaxial cavity filter design. The implementation of filter is four-order tapped combline structure. With steep edge has the advantages of filters, implemented by adding filter series, here the 4 resonant level. The zeros are produced by cross coupling between non-adjacent resonators and introduction of Z shaped conductor layer.

Performance achieved by the LTCC micro filter design: size: 3.2mm: * 2.5mm * 1.5mm, the center frequency: 4GHz,: 400MHz, the bandwidth of the passband insertion loss is less than 2.1dB, the passband: return loss better than 17dB, the stopband suppression is better than 32dB.

Key word: LTCC,Mcrowave filter,High stopband suppression,Stripline.

目  录

摘    要 1

Abstract 2

1绪论 5

1.1 研究的背景和意义 5

2  LTCC工艺简介 5

2.1  引言 5

2.2  工艺特点 6

2.3  LTCC技术的应用 7

2.4  LTCC中电感和电容实现 9

3  滤波器基本理论 17

3.1  引言 17

3.2  滤波器的分类和技术指标 18

3.3  用插入损耗法设计滤波器 20

3.4  广义切比雪夫滤波器理论 21

3.5  计算机辅助设计滤波器 23

4  分布滤波器基本理论 24

4.1  引言 24

4.2  梳状线滤波器理论 25

4.3  谐振器耦合分析 26

4.4  交叉耦合理论 30

4.5  LTCC中的带状线 32

5  4G滤波器设计 37