本文關(guān)鍵詞： 微波 大功率 材料非線性 介電常數(shù)　出處：《電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著雷達(dá)、無線通信、遙感探測等技術(shù)的快速發(fā)展,微波成了現(xiàn)代社會(huì)中必不可少的組成部分。由于微波在實(shí)際應(yīng)用中的功率和頻率在不斷提升,對于材料在微波大功率條件下的電磁性能的研究變得越發(fā)緊迫且重要。但是在微波大功率條件下材料的電磁特性往往會(huì)有別于直流和低頻,而出現(xiàn)一些特殊的現(xiàn)象。目前,關(guān)于材料的電磁參數(shù)隨微波功率變化的研究還非常少。這對于實(shí)際應(yīng)用來說是遠(yuǎn)遠(yuǎn)不夠的。所以本課題的目的便在于研究材料在微波大功率條件下的特殊現(xiàn)象。此項(xiàng)研究無論在微波領(lǐng)域還是材料領(lǐng)域都具有非常重要的理論和工程意義。材料的非線性是指,材料的電磁參數(shù),如介電常數(shù)、損耗正切、磁導(dǎo)率等,隨著微波功率或者頻率的變化而產(chǎn)生變化的現(xiàn)象。本課題的主要研究材料電磁參數(shù)由于微波電場強(qiáng)度的變化而產(chǎn)生的非線性現(xiàn)象。為了完成本課題的研究。首先,以課題的研究內(nèi)容為方向,了解并分析了課題相關(guān)的國內(nèi)外的理論與測試技術(shù)的發(fā)展?fàn)顩r。其次,分析了在微波大功率條件下材料可能產(chǎn)生的非線性現(xiàn)象及其機(jī)理。并對一些材料的微觀機(jī)理和特殊性質(zhì)進(jìn)行了解和分析。然后,利用矢量網(wǎng)絡(luò)分析儀和功率放大器組建了高功率微波電場作用和測試實(shí)驗(yàn)系統(tǒng),研制了TM0n0模高功率電場產(chǎn)生諧振系統(tǒng)。最后,選擇一些微波大功率條件下的常用的材料,如石蠟、聚四氟乙烯、鐵電體、惰性氣體等進(jìn)行實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明,鐵電體材料的介電常數(shù)和損耗正切都會(huì)隨著微波功率的變化而產(chǎn)生變化。惰性氣體在微波強(qiáng)電場的作用下會(huì)被電離而成為等離子體。高損耗的電介質(zhì),在微波強(qiáng)電場的作用下會(huì)迅速吸收能量而升溫,從而導(dǎo)致介電常數(shù)和損耗的變化。但是實(shí)驗(yàn)中的低損耗電介質(zhì)材料在目前的實(shí)驗(yàn)功率和頻率下,未觀測出明顯變化,不能得出具有非線性特性的結(jié)論。相關(guān)課題目前在國內(nèi)報(bào)導(dǎo)極少,屬開創(chuàng)性的探索工作,作者在該研究方向上作了起步性的研究。本課題的研究為進(jìn)一步研究微波大功率條件下材料的非線性研究奠定了基礎(chǔ)。作者希望通過本課題的研究使業(yè)界人士更加的關(guān)注材料電磁參數(shù)隨微波功率的變化,以此來推動(dòng)材料電磁學(xué)的發(fā)展。
[Abstract]:In recent years, with the rapid development of radar, wireless communication, remote sensing and other technologies, microwave has become an essential part of modern society. The study of the electromagnetic properties of materials under the condition of microwave power becomes more and more urgent and important. However, the electromagnetic characteristics of materials under the condition of microwave power are often different from those of DC and low frequency, and some special phenomena appear. There are few studies on the electromagnetic parameters of materials varying with microwave power, which is far from enough for practical applications. Therefore, the purpose of this paper is to study the special phenomena of materials under the condition of microwave power. This research is of great theoretical and engineering significance in both microwave and material fields. Electromagnetic parameters of materials, such as dielectric constant, loss tangent, permeability, etc. The main research of this subject is the nonlinear phenomenon caused by the change of the electromagnetic parameters of materials due to the change of the microwave electric field intensity. In order to complete the research of this subject, first of all, Taking the research content of the project as the direction, the development situation of the theory and test technology at home and abroad related to the subject is understood and analyzed. Secondly, In this paper, the possible nonlinear phenomena and mechanism of materials under microwave and high power conditions are analyzed, and the microscopic mechanism and special properties of some materials are analyzed. The experiment system of high power microwave electric field action and measurement is constructed by using vector network analyzer and power amplifier, and the resonant system of TM0n0 mode high power electric field is developed. Finally, some common materials under microwave and high power condition are selected. Such as paraffin, polytetrafluoroethylene, ferroelectrics, inert gases, etc. The experimental results show that, The dielectric constant and loss tangent of ferroelectric materials change with the change of microwave power. The inert gas is ionized into plasma under the strong electric field of microwave. Under the action of the strong electric field of microwave, the energy is absorbed rapidly and the temperature is heated, which leads to the change of dielectric constant and loss. However, the low loss dielectric material in the experiment does not show obvious change at the present experimental power and frequency. It is impossible to draw a conclusion with nonlinear characteristics. The related topics are rarely reported in China and are pioneering explorations. The author has made a preliminary study in this research direction. The research of this subject lays a foundation for further research on the nonlinearity of materials under the condition of microwave and high power. The author hopes that through the research of this subject, people in the industry will become more. The electromagnetic parameters of the added materials vary with microwave power, In order to promote the development of material electromagnetics.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN015

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張寒琦,金欽漢;微波化學(xué)[J];大學(xué)化學(xué);2001年01期

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本文編號(hào)：1498149