基于LTCC工艺的3dB耦合器设计

摘要低温共烧陶瓷（low temperature cofired ceramic，LTCC）技术是实现微波和高频器件小型化、高可靠、低成本的有效方法。本文针对微波及高频电路中核心器件耦合器的结构、实现工艺和性能优化开展研究，通过理论论证和仿真分析，结合 LTCC 工艺技术设计出了三种 LTCC 3dB 耦合器。首先给出了采用宽边耦合线结构的 LTCC 耦合器设计，该耦合器的工作频段为 1.4~1.8GHz；之后针对接收系统中镜像抑制混频器的要求，基于奇、偶模分析理论，利用集总参数设计了两种 LTCC 正交 3dB 耦合器，工作频段为 50~70MHz。其中第三种是在第二种基础上改进得到的，尺寸为 14.7mm×8.4mm×1mm，结构新颖紧凑。三维电磁仿真结果表明这两种新型 LTCC 中频 3dB 耦合器具有优良的性能，技术指标优于现有的同频段耦合器，可广泛应用于实际的微波集成通信系统中。68431

毕业论文关键词低温共烧陶瓷 3dB 耦合器集总参数镜像抑制混频器

Title Design of 3dB Coupler Based on LTCC

Abstract

Low temperature cofired ceramic (LTCC) is an effective method to realize the miniaturization, high reliability and low cost for microwave and high-frequency devices. For the design of coupler, which is the key device in microwave and high-frequency circuits, structure and accomplish technology with better performance were discussed. According to the basic theory and analysis of simulation, three kinds of 3dB coupler based on LTCC technology were designed in the thesis. Firstly, the LTCC coupler with broadside coupled line structure was given and the working frequency is 1.4~1.8GHz. Then according to the requirements of image rejection mixer (IRM) in receiving systems , two kinds of LTCC 3dB quadrature couplers using lumped elements were designed based on the even-odd decompositon method, and their working frequency is 50~70MHz. The third one is improved based on the second one, while the size is only 14.7mm×8.4mm×1mm, with a novel and compact structure. Three dimensional electromagnetic simulation results show that these two new LTCC IF 3dB couplers have good performance, better than the couplers existing and can be widely used in the microwave integrated communication systems.

Keywords LTCC 3dB coupler Lumped elements IRM

1 引言 1

1.1 耦合器的研究背景与现状 1

1.2 LTCC 技术概述 3

1.3 本文主要研究内容 4

2 耦合器的原理和理论分析 6

2.1 耦合器概述 6

2.2 耦合器的主要技术指标 7

2.3 耦合器的网络分析 8

2.4 耦合线理论分析 10

2.5 本章小结 12

3 LTCC 技术与仿真软件 13

3.1 基于LTCC工艺的3dB耦合器设计:http://www.751com.cn/tongxin/lunwen_76954.html