本文選題：MIMO + 降耦合��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)經(jīng)濟(jì)、文化的不斷發(fā)展,各種多媒體業(yè)務(wù)不斷出現(xiàn),對(duì)無(wú)線(xiàn)通信系統(tǒng)的要求不斷提高。在通信系統(tǒng)的容量、傳輸速率等方面提出了新的要求。多天線(xiàn)系統(tǒng)的使用,特別是多輸入多輸出(multiple-input-multiple-output,MIMO)天線(xiàn)系統(tǒng)的使用,是在有限的帶寬內(nèi),提高信道容量,加快傳輸速率,提升可靠性的有效途徑。然而將多天線(xiàn)元設(shè)置在較小的空間內(nèi),將會(huì)引起天線(xiàn)元彼此之間的耦合,激發(fā)耦合表面電流,從而影響天線(xiàn)的整體性能。為此如何提高隔離度以成為MIMO天線(xiàn)技術(shù)發(fā)展的核心問(wèn)題。同時(shí)如何在寬帶范圍內(nèi),讓MIMO天線(xiàn)的天線(xiàn)元之間均保持良好的隔離度,也是一個(gè)重要研究方向。本文的主要研究?jī)?nèi)容如下:1.設(shè)計(jì)了一種4×4寬帶高隔離MIMO天線(xiàn),工作頻帶為4.3-15.5GHz。基于枝節(jié)加載的原理,具有良好的隔離度,在工作帶寬內(nèi)隔離度超過(guò)15dB,在大部分帶寬超過(guò)20dB。該天線(xiàn)的尺寸為40×40mm~2,采用FR4介質(zhì)基板,相對(duì)介電常數(shù)為4.4,厚度為0.8mm。本天線(xiàn)單元設(shè)計(jì)為共面波導(dǎo)天線(xiàn),其地板本身可產(chǎn)生與傳統(tǒng)地板枝節(jié)類(lèi)似的作用,改變耦合電流分布,提高端口間的隔離度。并且通過(guò)合理設(shè)計(jì)天線(xiàn)元的相對(duì)位置,實(shí)現(xiàn)了進(jìn)一步降低耦合的效果。2.提出了一種尺寸為25×40×1.6mm~3的小型化MIMO天線(xiàn)。兩個(gè)天線(xiàn)單元對(duì)稱(chēng)地印刷在介質(zhì)基板上,并工作在5.8GHz。通過(guò)在天線(xiàn)單元間引入超材料結(jié)構(gòu)來(lái)抑制天線(xiàn)單元的表面波,以實(shí)現(xiàn)降低耦合度的目的。此天線(xiàn)端口間的隔離度具有高于24dB的隔離度,并且具有良好的方向圖、效率和增益。3.設(shè)計(jì)了一種平面單極子小型化超寬帶MIMO天線(xiàn)。該小型化MIMO天線(xiàn)工作頻帶為3GHz-10.7GHz,尺寸僅為30×40mm~2。該天線(xiàn)在小尺度的空間內(nèi),在兩個(gè)平面單極子天線(xiàn)單元之間引入地板枝節(jié),通過(guò)優(yōu)化地板枝節(jié)的參數(shù),來(lái)優(yōu)化阻抗匹配帶寬,并提高天線(xiàn)的隔離度。并且方向圖可覆蓋整個(gè)立體空間,非常適用于超寬帶無(wú)線(xiàn)通信系統(tǒng)。
[Abstract]:With the development of social economy and culture, various multimedia services appear constantly, and the requirement of wireless communication system is raised. New requirements are put forward in terms of the capacity and transmission rate of the communication system. The use of multi-antenna systems, especially multiple-input-multiple-output multiple-output (MIMO) antenna systems, is an effective way to increase channel capacity, speed up transmission rate and enhance reliability within a limited bandwidth. However, if the multi-antenna elements are placed in a small space, the coupling between the antenna elements and the coupling surface current will be induced, which will affect the overall performance of the antenna. Therefore, how to improve isolation becomes the core problem in the development of MIMO antenna technology. At the same time, how to keep a good isolation between the elements of MIMO antenna is also an important research direction. The main contents of this paper are as follows: 1. A 4 脳 4 wideband and high isolation MIMO antenna is designed. The operating frequency band is 4.3-15.5 GHz. Based on the principle of branch loading, it has a good isolation degree, which is more than 15 dB in the working bandwidth and more than 20 dB in most of the bandwidth. The size of the antenna is 40 脳 40mm / m2, the FR4 dielectric substrate is used, the relative dielectric constant is 4.4 and the thickness is 0.8mm. The antenna element is designed as a coplanar waveguide antenna, and the floor itself can produce a similar effect to the traditional floor branch, which changes the coupling current distribution and improves the isolation between ports. And by reasonably designing the relative position of antenna elements, the effect of further reducing coupling. 2. A miniaturized MIMO antenna with a size of 25 脳 40 脳 1.6mm~3 is proposed. The two antenna elements are symmetrically printed on the dielectric substrate and operate at 5.8 GHz. In order to reduce coupling degree, the surface wave of antenna element is suppressed by introducing metamaterial structure between antenna elements. The isolation of this antenna port is higher than that of 24dB, and has good pattern, efficiency and gain. 3. A planar monopole miniaturized UWB MIMO antenna is designed. The operating band of the miniaturized MIMO antenna is 3GHz-10.7GHz, and the size is only 30 脳 40mm / 2. In the small scale space, the floor segment is introduced between the two planar monopole antenna elements. By optimizing the parameters of the floor branch, the impedance matching bandwidth is optimized and the isolation degree of the antenna is improved. And the pattern can cover the whole three-dimensional space, very suitable for UWB wireless communication 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】：2017
【分類(lèi)號(hào)】：TN822

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 俞鈺峰;應(yīng)用于無(wú)線(xiàn)通信的小型化天線(xiàn)研究[D];浙江大學(xué);2013年

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本文編號(hào)：1806992