【摘要】：人工電磁軟硬表面結(jié)構(gòu)具有混合電磁邊界特性,其中電磁軟表面結(jié)構(gòu)具有阻帶特性使一定頻率范圍內(nèi)的電磁波能量不能傳播,而電磁硬表面結(jié)構(gòu)則能夠在一定頻率范圍內(nèi)增強(qiáng)電磁波能量傳播。由于人工電磁軟硬表面結(jié)構(gòu)具有的特異電磁特性,其在微波和天線領(lǐng)域有著廣泛的工程應(yīng)用前景。電磁軟硬表面結(jié)構(gòu)的前期研究主要集中于理想電磁軟硬邊界條件的數(shù)值分析,而人工電磁軟硬表面結(jié)構(gòu)的設(shè)計(jì)和應(yīng)用研究才剛剛起步,因此,新型的寬帶、小型化電磁軟硬表面結(jié)構(gòu)的設(shè)計(jì)及其應(yīng)用急需研究。論文主要研究人工電磁軟硬表面結(jié)構(gòu)基本理論和設(shè)計(jì)方法,電磁軟表面結(jié)構(gòu)應(yīng)用于減縮天線間的相互耦合作用,以及基于電磁硬表面結(jié)構(gòu)的金屬圓柱體隱身斗篷設(shè)計(jì)。論文主要包括以下幾個(gè)方面:1.研究了傳統(tǒng)電磁軟表面結(jié)構(gòu)的電磁特性及其結(jié)構(gòu)和尺寸參數(shù)變化規(guī)律,重點(diǎn)討論周期單元間距離對(duì)電磁軟表面結(jié)構(gòu)性能的影響,基于此指導(dǎo)新型人工電磁軟表面結(jié)構(gòu)的設(shè)計(jì)。2.提出一種寬帶小型化的電磁軟表面結(jié)構(gòu)。通過在傳統(tǒng)條帶型電磁軟表面結(jié)構(gòu)上加載縫隙,實(shí)現(xiàn)中心頻率向低頻移動(dòng),從而實(shí)現(xiàn)小型化。通過在條帶邊緣加載相互交錯(cuò)的鋸齒形結(jié)構(gòu)實(shí)現(xiàn)寬帶效果,與當(dāng)前國(guó)際發(fā)表的關(guān)于電磁軟表面結(jié)構(gòu)最新論文中的電磁軟表面結(jié)構(gòu)相比,當(dāng)電磁軟表面單元周期同為8 mm時(shí),中心頻率從6 GHz降低到5 GHz實(shí)現(xiàn)了小型化,相對(duì)帶寬從8.1%提高到12.5%。且在將此電磁軟表面結(jié)構(gòu)應(yīng)用于減縮微帶天線間耦合作用時(shí),耦合作用減縮相對(duì)帶寬從2%提高到8%。3.研究了電磁硬表面結(jié)構(gòu)的性質(zhì)和其隨參數(shù)變化規(guī)律,以及電磁硬表面結(jié)構(gòu)的電磁散射特性,發(fā)現(xiàn)條帶型電磁硬表面結(jié)構(gòu)在一定條件下具有電磁散射的全向減縮特征。4.提出一種基于電磁硬表面結(jié)構(gòu)的應(yīng)用于金屬圓柱體的隱身斗篷設(shè)計(jì)方法。該設(shè)計(jì)同其它電磁隱身斗篷設(shè)計(jì)方法相比,結(jié)構(gòu)簡(jiǎn)單,易于應(yīng)用,且對(duì)電磁散射減縮效果明顯。該結(jié)構(gòu)相比之前的電磁硬表面結(jié)構(gòu)隱身斗篷帶寬更寬,厚度更薄,例如在中心頻率為4.2 GHz時(shí),帶寬從14.3%增加到22.2%,厚度從9.41 mm減小到2 mm。
[Abstract]:The artificial electromagnetic soft and hard surface structure has mixed electromagnetic boundary characteristics, in which the electromagnetic soft surface structure has the characteristic of stopband, which makes the electromagnetic wave energy in a certain frequency range unable to propagate. On the other hand, the electromagnetic hard surface structure can enhance the electromagnetic wave energy propagation in a certain frequency range. Because of the special electromagnetic characteristics of artificial electromagnetic soft and hard surface structure, it has a wide range of engineering applications in microwave and antenna fields. The previous study of electromagnetic soft and hard surface structure is mainly focused on numerical analysis of ideal electromagnetic soft and hard boundary conditions, but the design and application of artificial electromagnetic soft and hard surface structure have just started. The design and application of miniaturized electromagnetic soft and hard surface structure are urgently needed. This paper mainly studies the basic theory and design method of artificial electromagnetic soft and hard surface structure, the application of electromagnetic soft surface structure to the coupling between reducing antennas, and the design of metal cylinder stealth cloak based on electromagnetic hard surface structure. The paper mainly includes the following aspects: 1. The electromagnetic characteristics of the traditional electromagnetic soft surface structure and the variation law of the structure and size parameters are studied. The influence of the distance between periodic elements on the structure performance of the electromagnetic soft surface is discussed. Based on this, the design of the new artificial electromagnetic soft surface structure is guided. A wide band miniaturized electromagnetic soft surface structure is proposed. By loading gaps on the traditional strip electromagnetic soft surface structure, the center frequency is moved to low frequency, thus realizing miniaturization. The broadband effect is achieved by loading a zigzag structure on the edge of the strip. Compared with the electromagnetic soft surface structure in the latest paper on the electromagnetic soft surface structure published in the world, when the electromagnetic soft surface cell cycle is 8 mm, The center frequency is reduced from 6 GHz to 5 GHz and the relative bandwidth is increased from 8.1% to 12.5 GHz. When the electromagnetic soft surface structure is applied to reduce the coupling between microstrip antennas, the relative bandwidth of coupling reduction is increased from 2% to 8. 3. The properties of the electromagnetic hard surface structure and its variation with parameters and the electromagnetic scattering characteristics of the electromagnetic hard surface structure are studied. It is found that the strip hard surface structure has the characteristics of omnidirectional reduction of electromagnetic scattering under certain conditions. A design method of stealth cloak for metal cylinders based on electromagnetic hard surface structure is presented. Compared with other design methods of electromagnetic stealth cloak, this design has the advantages of simple structure, easy application and obvious effect on reducing electromagnetic scattering. Compared with the former electromagnetic hard surface structure, the cloak has wider bandwidth and thinner thickness. For example, when the center frequency is 4.2 GHz, the bandwidth increases from 14.3% to 22.2mm, and the thickness decreases from 9.41 mm to 2 mm.
【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)】：O441.4

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