微波单层片式陶瓷电容的测量

发布时间：2018-05-07 05:35

本文选题：微波单层片式陶瓷电容 + 谐振频率　；参考：《电子科技大学》2015年硕士论文

【摘要】：微波介质陶瓷是近几十年才发展起来的一类新型的电子材料,是国内外近年来对微波介质材料研究领域内的热点方向,它被广泛应用于通信领域的很多方面,特别是移动通信系统中。用其加工的微波器件具有低损耗、温度系数低、易于小型化等特点。现今高速高密度PCB设计已成为电子产品的重要发展之一,许多现代电子产品的速度越来越高。计算机的时钟频率提高到几百兆赫乃至千兆赫,无绳电话的频率从45MHz提高到2.4GHz,数字无线传输的频率达到2GHz以上,相应地对电容器的高频稳定性提出了越来越高的要求。用陶瓷材料作为介质的微波陶瓷贴片电容已大量地用于射频和微波电路中,而微波单层片式陶瓷电容器具有良好的高频性能,其谐振频率有的已经高达十几甚至几十个GHz,它极小的尺寸也有利于微波器件的小型化设计,所以在高频下对微波单层片式陶瓷电容进行测量具有十分重要的价值。本文将围绕微波单层片式陶瓷贴片电容的电容量的测量理论和方法进行研究,所作的主要工作内容可概括如下:1.对已有测量传统高频陶瓷贴片电容的理论和方法进行归纳和总结,以此为基础结合微波单层片式陶瓷电容自身尺寸和电磁特性重新设计测量结构。2.运用微带线传输理论并结合计算机仿真软件HFSS设计了能够测量微波单层片式陶瓷电容的微带结构,得到仿真条件下传输系数的数据,然后利用Matlab工具软件编写程序拟合出电容器的电容值,由此,测量得到了单层片式陶瓷电容的电容值。3.加工装配测量装置,进行了传输系数的测试,根据测试结果修正测量方法,最终获得有效准确的测量微波单层片式陶瓷电容的方法。
[Abstract]:Microwave dielectric ceramics are a kind of new electronic materials developed in recent decades. They are the hot points in the research field of microwave dielectric materials at home and abroad in recent years. They are widely used in many aspects of communication field. Especially in mobile communication system. The microwave device fabricated by the device has the advantages of low loss, low temperature coefficient and easy miniaturization. Nowadays, high speed and high density PCB design has become one of the important developments of electronic products, and the speed of many modern electronic products is getting higher and higher. The clock frequency of computer is raised to several hundred MHz or even gigahertz, the frequency of cordless telephone is increased from 45MHz to 2.4 GHz, and the frequency of digital wireless transmission is above 2GHz. Accordingly, the high frequency stability of capacitor is demanded more and more. Microwave ceramic patch capacitors with ceramic materials as dielectric have been widely used in RF and microwave circuits, while microwave monolayer ceramic capacitors have good high frequency performance. Some of its resonant frequency has reached more than 10 or even dozens of GHz, and its minimal size is also beneficial to the miniaturization design of microwave devices. Therefore, it is of great value to measure microwave monolayer ceramic capacitors at high frequency. In this paper, the measurement theory and method of capacitance of microwave monolayer ceramic patch capacitor are studied. The main work can be summarized as follows: 1. The existing theories and methods of measuring traditional high frequency ceramic patch capacitors are summarized and summarized. Based on these theories, the measurement structure of microwave monolayer ceramic capacitors is redesigned in combination with the size and electromagnetic characteristics of microwave monolayer ceramic capacitors. Using the theory of microstrip transmission and the computer simulation software HFSS, the microstrip structure which can measure the microwave single-layer ceramic capacitance is designed, and the data of transmission coefficient under the simulation condition are obtained. Then the capacitor value of the capacitor is fitted by Matlab software, and the capacitance value of the single-layer ceramic capacitor is measured. 3. The transmission coefficient was measured by machining and assembling measuring device, and the measuring method was revised according to the test results. Finally, an effective and accurate method for measuring microwave monolayer ceramic capacitance was obtained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN04;TM934.2

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