本文關鍵詞： 左手材料 小型化 差分天線 帶寬 增益　出處：《山西大學》2014年碩士論文　論文類型：學位論文

【摘要】：無線通信技術的快速發(fā)展,促進了緊湊、全集成射頻前端產(chǎn)品成為無線通信系統(tǒng)的設計主流。差分天線改變了傳統(tǒng)的單端口設計方法,直接把差分信號饋入到天線的兩個端口,為設計高集成的射頻前端提供了有效的解決方案。微帶天線因重量輕、剖面低、易于集成等諸多優(yōu)點,已在諸多領域得到廣泛的應用。因此,差分微帶天線的研究引起了學者們的廣泛關注。左手材料是自然界中不存在的人工周期結構,它具有介電常數(shù)和磁導率為負的特點。由于左手材料具有負折射、反常多普勒效應、完美透鏡等奇異特點,因此左手材料具有潛在的應用價值。將左手材料應用于天線,提高天線性能成為一個越來越重要的研究方向。本文主要研究了基于左手材料的差分單頻貼片天線和基于左手材料的差分雙頻縫隙天線。論文主要包括以下幾部分內容：第一部分,簡要介紹了差分微帶天線和左手材料的研究現(xiàn)狀。第二部分,首先介紹微帶天線的基本概念和基礎理論,包括微帶天線的分類和饋電方式,表征天線性能的幾個重要參數(shù)。其次介紹左手材料的概念,左手結構實現(xiàn)的理論依據(jù)及左手材料等效介質參數(shù)提取方法。第三部分,提出了一種應用于全球微波互聯(lián)接入網(wǎng)絡(Worldwide Interoperability for Microwave Access, WiMAX)的差分單頻貼片天線,通過在輻射貼片刻蝕U型縫隙的方法實現(xiàn)天線的小型化。與傳統(tǒng)的半波長天線相比,天線的尺寸為15 mm ×15 mm (0.38 λg × 0.38 Ag, Ag為天線的導波波長)。為了改善天線的帶寬性能,設計了一種新型的啞鈴型開口環(huán)金屬線復合周期結構的左手材料,將左手材料作為天線的覆層。結果表明,覆層左手材料的差分單頻貼片天線的帶寬和增益均得到改善。第四部分,提出了一種應用于射頻識別(Radio Frequency Identification, RFID)和無線局域網(wǎng)(Wireless Local Area Network, WLAN)的差分雙頻縫隙天線,通過彎折縫隙的方法實現(xiàn)天線的雙頻諧振和小型化特性。與傳統(tǒng)的半波長天線相比,天線尺寸為60 mm × 60 mm (0.36 λg × 0.36 λg,λg為天線低頻段的導波波長)。為了改善天線低頻段帶寬性能,設計了一種新型的雙頻段左手材料,將左手材料作為天線的覆層。結果表明,覆層左手材料的差分雙頻縫隙天線的帶寬,增益及輻射特性均得到改善。
[Abstract]:With the rapid development of wireless communication technology, compact, fully integrated RF front-end products have become the mainstream of wireless communication system design. Differential antenna has changed the traditional single-port design method. The differential signal is fed directly to the two ports of the antenna, which provides an effective solution for the design of a high integrated RF front-end. The microstrip antenna has many advantages such as light weight, low profile, easy integration and so on. It has been widely used in many fields. Therefore, the research of differential microstrip antenna has attracted the attention of scholars. Left-handed materials are artificial periodic structures that do not exist in nature. It has the characteristics of negative dielectric constant and negative permeability due to the negative refraction, anomalous Doppler effect, perfect lens and other singular characteristics of left-handed materials. Therefore, left-handed materials have potential application value. Left-handed materials are used in antenna. Improving antenna performance has become a more and more important research direction. In this paper, the differential single-frequency patch antenna based on left-handed material and the differential dual-frequency slot antenna based on left-handed material are studied. Subsections:. Part one. The research status of differential microstrip antenna and left-handed material is briefly introduced. The second part introduces the basic concept and basic theory of microstrip antenna including the classification and feed mode of microstrip antenna. Several important parameters to characterize the antenna performance. Secondly, the concept of left-handed material, the theoretical basis for realization of left-handed structure and the method of extracting equivalent medium parameters of left-handed material are introduced. Part three. A worldwide Interoperability for Microwave Access for global microwave interconnection access network is proposed in this paper. The differential single-frequency patch antenna of WiMAX is miniaturized by etching the U-shaped slot in the radiation patch, compared with the traditional half-wavelength antenna. The size of the antenna is 15 mm 脳 15 mm, 0.38 位 g 脳 0.38 Ag. Ag is the guiding wavelength of the antenna. In order to improve the bandwidth performance of the antenna. A new type of left hand material for the composite periodic structure of the dumbbell-shaped open ring metal wire is designed. The left-handed material is used as the coating of the antenna. The results show that the left hand material can be used as the coating of the antenna. The bandwidth and gain of the Left-coated differential single-frequency patch antenna are improved. Part 4th. A new radio frequency identification (RFID) radio Frequency Identification is proposed. RFIDs and WLAN Wireless Local Area Network (WLAN) differential dual-frequency slot antennas. The dual-frequency resonance and miniaturization of the antenna are realized by bending slot, which is compared with the traditional half-wavelength antenna. The antenna size is 60mm 脳 60mm, 0.36 位 g 脳 0.36 位 g, 位 g is the guided wave wavelength of the antenna in low frequency band, in order to improve the bandwidth performance of the antenna at low frequency band. A new type of double-band left-handed material is designed. The left-handed material is used as the coating layer of antenna. The results show that the bandwidth, gain and radiation characteristics of the double-band slot antenna are improved.
【學位授予單位】：山西大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN822

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本文編號：1443862