發(fā)布時間：2018-11-09 11:36

【摘要】：全息調(diào)制表面作為人工電磁表面的一種,具有結(jié)構(gòu)簡單、剖面低、高增益、易共形等優(yōu)良特性,并為電磁波的精確調(diào)控提供了新的可能。電磁能量收集在能量收集領(lǐng)域?qū)儆诤笃鹬��?近來由于空間電磁能量急劇增長和其不受時間空間影響等優(yōu)勢,讓其在不遠(yuǎn)的將來為無線傳感器網(wǎng)絡(luò)和無線設(shè)備供電成為可能。將全息調(diào)制表面技術(shù)應(yīng)用于電磁能量收集是一件極富意義的工作,有很大的理論研究空間和實際應(yīng)用價值。國內(nèi)外科研團隊在人工電磁表面和電磁能量收集領(lǐng)域展開了深入研究,但將二者結(jié)合的研究工作還處于起步階段。本文為將全息調(diào)制表面天線應(yīng)用于電磁能量收集領(lǐng)域,重點展開了以下研究工作:一、針對傳統(tǒng)中心饋電全息表面天線主波束輻射方向存在凹陷的現(xiàn)象,通過改變?nèi)�息阻抗表面調(diào)制函數(shù)和饋源位置的方式,將主波束方向零點消除。二、借鑒巴比涅原理,采用全息表面的互補結(jié)構(gòu)作為全息天線的地面。通過全息結(jié)構(gòu)和其互補結(jié)構(gòu)的強烈近場耦合作用引導(dǎo)表面電流向邊沿傳播,更均勻的表面電流分布有效提高了天線增益。三、基于全息調(diào)制表面生成思想,改變目標(biāo)輻射波函數(shù)和饋源位置,設(shè)計出雙波束和圓錐波束全息表面天線。通過將全息表面劃分為四象限,每個象限獨立輻射一列波束的設(shè)計思想,實現(xiàn)全息表面天線四波束輻射。將全息調(diào)制表面天線用于電磁能量收集領(lǐng)域,并轉(zhuǎn)化為實際應(yīng)用為無線裝備供能還有若干亟待研究的問題。多極化全息表面接收天線和寬頻帶電磁能量收集系統(tǒng)的設(shè)計,可以有效提高自由空間電磁能量收集效率;超低輸入功率下整流電路的高轉(zhuǎn)化效率和有效的功率管理單元設(shè)計是保證科學(xué)研究走向?qū)嶋H應(yīng)用的關(guān)鍵。
[Abstract]:As a kind of artificial electromagnetic surface, holographic modulated surface has the advantages of simple structure, low profile, high gain, easy conformal, and provides new possibilities for accurate control of electromagnetic wave. Electromagnetic energy collection is a rising star in the field of energy collection. Recently, due to the rapid growth of space electromagnetic energy and its independence from the influence of time and space, it is possible to power wireless sensor networks and wireless devices in the near future. The application of holographic modulation surface technology to electromagnetic energy collection is of great significance and has great theoretical research space and practical application value. The research teams at home and abroad have carried out in-depth research in the field of artificial electromagnetic surface and electromagnetic energy collection, but the research work of combining the two is still in its infancy. In order to apply holographic modulated surface antenna to the field of electromagnetic energy collection, the following research work has been carried out in this paper: firstly, the main beam radiation direction of the traditional center fed holographic surface antenna is depressed. The azimuth of the main beam is eliminated by changing the surface modulation function of the holographic impedance and the position of the feed. Secondly, the complementary structure of holographic surface is used as the ground of holographic antenna. The strong near-field coupling between the holographic structure and its complementary structure leads the surface current to propagate to the edge, and a more uniform distribution of the surface current increases the antenna gain effectively. Thirdly, based on the idea of holographic modulation surface generation, a double beam and conical beam holographic surface antenna is designed by changing the target radiation wave function and feed position. By dividing the holographic surface into four quadrants, each quadrant radiates an independent array of beams to realize the four-beam radiation of the holographic surface antenna. The application of holographic modulated surface antenna in the field of electromagnetic energy collection and its practical application to wireless equipment still need to be studied. The design of multi-polarization holographic surface receiving antenna and broadband electromagnetic energy collection system can effectively improve the efficiency of electromagnetic energy collection in free space. The high conversion efficiency and effective power management unit design of the rectifier circuit under ultra-low input power are the key to ensure the scientific research to be applied in practice.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN820

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本文編號：2320296