【摘要】：相較于傳統(tǒng)的右手材料,左手材料具有逆向或反向效應(yīng),支持后向波傳播。由于它獨(dú)特的負(fù)折射率、逆多普勒效應(yīng)、亞波長衍射、逆切倫科夫輻射等電磁特性,使其具有廣泛的應(yīng)用前景,世界范圍內(nèi)左手材料的廣泛研究也推動(dòng)了尤其在微波器件中的相關(guān)應(yīng)用。由于其介電系數(shù)和磁導(dǎo)率為負(fù),能量與波矢量方向相反,所以具有左手定則。電磁帶隙材料(包括電磁帶隙結(jié)構(gòu)(EBG)和缺陷地結(jié)構(gòu)(DGS))是由光子晶體發(fā)展而來的,是由一種介質(zhì)在另一種介質(zhì)中周期性或非周期性排列組成的新型人工電磁材料,可控制等效介質(zhì)的電磁波傳播。其主要特點(diǎn)是,頻率落在材料帶隙內(nèi)時(shí),電磁波將無法傳播,材料具有帶阻、慢波、高阻抗、結(jié)構(gòu)緊湊等特點(diǎn),能更好的抑制諧波、提高效率,減小器件尺寸,具有廣泛的應(yīng)用前景。本文通過采用左手材料、缺陷地等新型結(jié)構(gòu),對(duì)幾種新型高性能的濾波器和移相器等無源器件進(jìn)行研究,以改善微波通信系統(tǒng)的性能。主要內(nèi)容概括如下:針對(duì)實(shí)際工程應(yīng)用以及現(xiàn)有微波器件的特點(diǎn),充分利用新型人工電磁材料獨(dú)特的電磁特性,從微波器件的設(shè)計(jì)理論出發(fā),該新型人工電磁材料在微波器件中可用于各種系統(tǒng)。主要研究人工電磁材料對(duì)微波器件原有功能和結(jié)構(gòu)的優(yōu)化改善,研制人工電磁材料型微波器件試樣,主要包括濾波器和移相器,工作頻段在Ku波段內(nèi)。通過采用新型人工電磁材料,進(jìn)一步改善微波器件的性能,減小微波器件尺寸,并兼顧器件的電磁兼容性能,同時(shí)探索開發(fā)器件的新功能,促進(jìn)微波器件進(jìn)一步向小型化、集成化、高可靠性、高可控性方向發(fā)展。本論文總共設(shè)計(jì)了兩款微波無源電路,從實(shí)驗(yàn)結(jié)果可以看出,他們的工作性能良好且具有明顯的尺寸優(yōu)勢。因此,它的研究進(jìn)一步表明,左手材料的使用,電磁帶隙結(jié)構(gòu)的設(shè)計(jì)對(duì)射頻系統(tǒng)的小型化和集成化的微波無源電路具有重要意義。
[Abstract]:Compared with traditional right-handed materials, left-handed materials have reverse or reverse effects, supporting backward wave propagation. Because of its unique negative refractive index, inverse Doppler effect, subwavelength diffraction, inverse Cherenkov radiation and other electromagnetic characteristics, it has a wide application prospect. The extensive research of left-handed materials in the world has also promoted the related applications especially in microwave devices. Because the permittivity and permeability are negative and the energy is opposite to the wave vector, there is a left-handed rule. Electromagnetic band gap materials (including electromagnetic band gap structure (EBG) and defective ground structure (DGS) are developed from photonic crystals) are new artificial electromagnetic materials consisting of one medium arranged periodically or aperiorly in another medium. The electromagnetic wave propagation of the equivalent medium can be controlled. The main characteristic is that the electromagnetic wave will not propagate when the frequency falls in the bandgap of the material. The material has the characteristics of band resistance, slow wave, high impedance and compact structure, which can better suppress harmonics, improve efficiency, and reduce the size of the device. It has wide application prospect. In order to improve the performance of microwave communication system, several new passive devices, such as high performance filters and phase shifters, are studied by using left-handed materials, defects and other new structures. The main contents are summarized as follows: according to the practical engineering application and the characteristics of existing microwave devices, the unique electromagnetic characteristics of new artificial electromagnetic materials are fully utilized, and the design theory of microwave devices is introduced. The new artificial electromagnetic material can be used in various systems in microwave devices. This paper mainly studies the optimization and improvement of the original function and structure of microwave devices by artificial electromagnetic materials, and develops the samples of microwave devices based on artificial electromagnetic materials, which mainly include filters and phase shifters. The operating frequency band is in the Ku band. Through the use of new artificial electromagnetic materials, the performance of microwave devices is further improved, the size of microwave devices is reduced, and the electromagnetic compatibility performance of the devices is taken into account. At the same time, the new functions of the devices are explored to promote the further miniaturization of microwave devices. Integrated, high reliability, high controllability development direction. In this paper, two microwave passive circuits are designed. The experimental results show that they have good performance and obvious size advantage. Therefore, its research further indicates that the use of left-handed materials and the design of electromagnetic bandgap structure are of great significance to the miniaturization and integration of microwave passive circuits in RF systems.
【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)】：TN713;TN623

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