發(fā)布時間：2018-07-16 22:06

【摘要】：相鄰天線之間的耦合與去耦合是天線設(shè)計研究的一個重要課題,天線相互之間的耦合常常會對無線通信系統(tǒng)的性能產(chǎn)生意想不到的影響。通�；ヱ顣档吞炀�的收發(fā)隔離度從而增加無線通信系統(tǒng)接收機(jī)設(shè)計的難度,因此對相鄰天線去耦合的研究具有重要的實際應(yīng)用價值。本文通過原理分析和仿真計算對相鄰微帶貼片天線的去耦合結(jié)構(gòu)的設(shè)計進(jìn)行了深入研究,論文的主要工作和貢獻(xiàn)如下:(1)設(shè)計了多種場對消共面型去耦結(jié)構(gòu),目的是為了解決緊密放置貼片天線間耦合問題。這種場對消去耦結(jié)構(gòu)是在天線間增加了一種間接耦合場使它與原有的直接耦合場相抵消,從而可以達(dá)到抑制互耦的目的。本文以微帶貼片天線去耦結(jié)構(gòu)為例。HFSS仿真結(jié)果可以看出在微帶天線緊密放置時,它們的隔離度在-10dB帶寬(100MHz)下最低可以達(dá)到25dB,在50MHz內(nèi)時此結(jié)構(gòu)的隔離度最低可以達(dá)到30dB。設(shè)計了一種基于缺陷地結(jié)構(gòu)的間接去耦結(jié)構(gòu),它是基于電磁帶隙結(jié)構(gòu)發(fā)展而來的一種結(jié)構(gòu),這種去耦結(jié)構(gòu)均能夠在微帶天線間的耦合路徑上進(jìn)行濾波來達(dá)到抑制耦合的目的,仿真結(jié)果表明該結(jié)構(gòu)在-10dB匹配帶寬(150MHz)內(nèi)隔離度最低可以達(dá)到17.5dB。(2)設(shè)計了多種異面型去耦結(jié)構(gòu),比如含金屬墻開路槽結(jié)構(gòu),此結(jié)構(gòu)不但可以利用場對消還可以利用中間的電路板來降低部分耦合來提高微帶天線間隔離度,仿真結(jié)果表明該結(jié)構(gòu)隔離度最低能夠達(dá)到21dB。還有金屬條帶型去耦結(jié)構(gòu),尤其T型對稱金屬條帶去耦結(jié)構(gòu)仿真結(jié)果表明在-10dB匹配帶寬(80MHz)內(nèi)隔離度最低可以達(dá)到41.5dB。
[Abstract]:The coupling and decoupling between adjacent antennas is an important research topic in antenna design. The coupling between antennas often has an unexpected impact on the performance of wireless communication systems. Mutual coupling usually reduces the isolation of antennas and increases the difficulty of receiver design in wireless communication systems. Therefore, the study of decoupling of adjacent antennas has important practical application value. In this paper, the design of decoupling structure of adjacent microstrip patch antenna is deeply studied through principle analysis and simulation calculation. The main work and contributions of this paper are as follows: (1) many field canceling coplanar decoupling structures are designed. The purpose of this paper is to solve the problem of coupling between tightly placed patch antennas. This decoupling structure adds an indirect coupling field between the antennas to counteract the original direct coupling field so that the mutual coupling can be suppressed. In this paper, we take the decoupling structure of microstrip patch antenna as an example. The results of HFSS simulation show that the isolation of microstrip antenna can reach 25 dB at -10 dB bandwidth (100 MHz) and 30 dB at 50 MHz. An indirect decoupling structure based on the defect ground structure is designed, which is based on the electromagnetic band gap structure. The decoupling structure can be filtered on the coupling path between the microstrip antennas to suppress the coupling. The simulation results show that the minimum isolation can reach 17.5 dB within -10dB matching bandwidth (150MHz). (2) A variety of off-plane decoupling structures are designed, such as metal-wall open-circuit groove structures. This structure not only can use field cancellation but also can reduce the partial coupling to improve the isolation degree of microstrip antenna. The simulation results show that the isolation degree of the structure can reach 21 dB. There are also metal strip decoupling structures, especially T symmetric metal strip decoupling structures. The simulation results show that the lowest isolation can reach 41.5 dB within -10dB matching bandwidth (80MHz).
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN822

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本文編號：2127813