分类号学号M*********
学校代码10487 密级
学位申请人：李彤彤
学科专业：微电子学与固体电子学
指导教师：曾亦可教授
答辩日期：2014年1月10日
A Thesis Submitted in Partial Fulfillment of the Requirements
for the Degree of Master of Engineering
An improvement of copper conductive paste in FPC technology and application of FPC in fractal antenna
Candidate： Li T ongtong
Major：Microelectronics and Solid Electronics
Supervisor： Professor Zeng Yike
Huazhong University of Science and Technology
Wuhan, 430074, P.R.China
January, 2014
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华中科技大学硕士学位论文
摘要
FPC柔性印刷电路板因其重量轻、体积小和可弯折的优点在电子产品领域应用广泛，本文主要研究了应用于FPC技术的铜导电浆料的工艺改进及其FPC技术在分形天线方面的应用。铜颗粒性能在铜导电浆料中起到重要作用，为了解决铜颗粒易于氧化的问题，提出了铜颗粒综合表面处理的方法，综合的铜颗粒表面处理包括了钝化、银包覆和偶联剂处理方法，铜颗粒经处理过后极大提升了其导电性能和稳定性能，基于此铜颗粒制成的导电膜方阻降低到15 mΩ，铜导电填充物的制作成本也因此降低，测试结果表明此综合处理方法可以应用于FPC印刷领域。 在此基础上研究了基于FPC工艺和分形理论而产生的分形贴片天线，结合分形理论在天线中的应用，利用HFSS电磁场仿真软件设计出基于聚酰亚胺基板的多频分形贴片天线。针对设计出的分形贴片天线结合FPC技术将其实物制作出来，并进行性能的测试，研究FPC技术在分形天线方面的应用。在仿
真中经过逐次迭代的方法得到分形图形，利用分形图形的自相似和分数维的特性应用到天线中可以得到多频和尺寸缩减的特性。随着分形图形迭代次数的增加，天线频段也相应增加，控制相关参数就可以得到需要频率的贴片天线。使用FPC工艺在聚酰亚胺基板上制作完成了三阶的Koch分形天线，经测试天线实物具备了结构仿真所表现出的特性，其谐振频率为UHF频段的898.4MHz及其蓝牙通信频段的2.322GHz，体现出了分形天线多频和尺寸缩减的特性。
关键词：铜颗粒表面改性铜导电浆料FPC技术分形天线
华中科技大学硕士学位论文
Abstract
FPC (Flexible Printed Circuit) is widely used in electronic products because of its advantages of "light, thin, short and small" and can be three-dimensional packaged. The specific goal of the present study is to study the improvement of copper conductive paste in FPC and application of FPC technology in the fractal antennas. Copper particles plays an important role in copper conductive pas
te. In order to solve the problem of oxidation of copper particles, this paper proposes a combinative modification method integrating passivation, silver-coated, and coupling agent. As a result, the copper powder has the stabilization improved, and the sheet resistance of the film fabricated by the copper conductive filler is reduced to 15 mΩ. The performance of the copper powder has been greatly enhanced by the combinative modification, and the cost of the copper conductive filler is decreased significantly by this method. The results indicate that the combinative surface modification method can be used for FPC application.
Fractal patch antenna is studied on the basis of the FPC process and fractal theory. Combining the application of fractal theory in antenna and HFSS (High Frequency Structure Simulator) electromagnetic field simulation software, the multi-frequency fractal patch antenna is designed on polyimide substrate. The fractal patch antenna is made by FPC technology, and its performance is tested. It is studied the application of FPC technology in the fractal antennas field. After successive iteration method in the simulation of HFSS software, the properties of self-similar and fractal dimension are applied to the antenna, and it can be obtained the characteristics of multi-frequency and reduced size. With the increase of fractal graphics iterations, the number of a ntenna frequencies increases accordingly, and the change of the relevant parameters can be related to the frequency of the antenna.
Third-order Koch fractal antenna are prepared by FPC technology on polyimide substrate. It is shown fractal antenna obtain the characteristics that the resonance frequency for the UHF frequency 898.4 MHz and Bluetooth communication frequency 2.322 GHz, together with the characteristics of fractal antenna multi-frequency and
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