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

目 次

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