【摘要】：隨著具有大容量、超寬帶等特征的綜合信息系統(tǒng)的迅猛發(fā)展,同一載體上需要的信息子系統(tǒng)數(shù)量不斷增加,這使得接收和發(fā)送信息的天線(xiàn)數(shù)量也相應(yīng)增加。同一載體上天線(xiàn)數(shù)量的增加將產(chǎn)生諸多問(wèn)題,如負(fù)重增加、天線(xiàn)間電磁干擾等,采用具有多天線(xiàn)功能的單一天線(xiàn)可以很好的解決上述問(wèn)題,此單一天線(xiàn)定義為可重構(gòu)天線(xiàn)。在可重構(gòu)天線(xiàn)中,以微帶天線(xiàn)為載體的研究最為廣泛,原因在于微帶天線(xiàn)所固有的重量輕、低成本、低剖面、易于與物體共形等特點(diǎn)。傳統(tǒng)的微帶天線(xiàn)往往通過(guò)控制PIN二極管或MEMS開(kāi)關(guān)的通斷來(lái)實(shí)現(xiàn)頻率、方向圖或極化方式可重構(gòu)。本文研究了一種新穎的可重構(gòu)方法,即在微帶天線(xiàn)上加載BST(鈦酸鍶鋇)鐵電薄膜實(shí)現(xiàn)頻率和方向圖可重構(gòu),其具有參數(shù)調(diào)節(jié)方便、頻率連續(xù)可調(diào)、電場(chǎng)分布均勻等特點(diǎn)。本文主要對(duì)以下兩個(gè)方面進(jìn)行了研究:1.微帶天線(xiàn)加載BST鐵電薄膜頻率可重構(gòu)技術(shù)研究研究了BST鐵電薄膜不同加載位置(輻射貼片底部和四周)和參數(shù)(寬度和厚度)對(duì)諧振頻率、輸入阻抗和方向圖的影響情況;在普通微帶貼片天線(xiàn)中的輻射貼片底部和四周加載BST鐵電薄膜實(shí)現(xiàn)了頻率可重構(gòu);在微帶偶極子天線(xiàn)中的對(duì)稱(chēng)陣子臂底部和四周加載BST鐵電薄膜實(shí)現(xiàn)了頻率可重構(gòu)。2.微帶八木天線(xiàn)加載BST鐵電薄膜方向圖可重構(gòu)技術(shù)研究研究了兩單元微帶八木天線(xiàn)加載BST鐵電薄膜的情況,改變加載于無(wú)源貼片底部和四周的BST鐵電薄膜介電常數(shù)值,實(shí)現(xiàn)了無(wú)源貼片引向功能和反射功能的相互轉(zhuǎn)換;在三單元微帶八木天線(xiàn)中的兩無(wú)源貼片底部和四周均加載BST鐵電薄膜,改變兩者介電常數(shù)值的相對(duì)大小,實(shí)現(xiàn)了方向圖可重構(gòu);對(duì)方向圖可重構(gòu)中出現(xiàn)的工作頻率處諧振深度不夠好、方向圖副瓣電平較高的問(wèn)題進(jìn)行了分析,通過(guò)在有源貼片上開(kāi)槽對(duì)問(wèn)題進(jìn)行了較好的解決,構(gòu)成了改進(jìn)的可重構(gòu)三單元微帶八木天線(xiàn)。
[Abstract]:With the rapid development of integrated information systems with large capacity and ultra-wideband (UWB) characteristics, the number of information subsystems needed on the same carrier is increasing, which makes the number of antennas receiving and transmitting information increase accordingly. The increase of the number of antennas on the same carrier will cause many problems, such as the increase of the load, the electromagnetic interference between antennas, and so on. Using a single antenna with multi-antenna function can solve the above problems well. This single antenna is defined as a reconfigurable antenna. Among the reconfigurable antennas, microstrip antennas are the most widely studied because of their inherent characteristics of light weight, low cost, low profile and easy conformal with objects. Traditional microstrip antennas can be reconfigurable by controlling the on-off of PIN diodes or MEMS switches. In this paper, a novel reconfigurable method is studied, that is, loading BST (strontium barium titanate) ferroelectric thin film on the microstrip antenna to reconfigure the frequency and pattern, which has the advantages of convenient parameter adjustment, continuous frequency adjustment, uniform electric field distribution, and so on. This paper mainly studies the following two aspects: 1. The influence of different loading positions (bottom and circumference of radiation patch) and parameters (width and thickness) on resonant frequency, input impedance and pattern of BST ferroelectric thin film loaded by microstrip antenna were studied. The frequency reconfiguration is realized by loading BST ferroelectric thin film at the bottom and around the radiation patch of the ordinary microstrip patch antenna, and the frequency reconfiguration is realized by loading the BST ferroelectric film at the bottom and around the symmetrical quad arm of the microstrip dipole antenna. 2. Reconfigurable technique of BST Ferroelectric Film pattern for microstrip Yagi Antenna the loading of BST ferroelectric thin films by two element microstrip Yagi Antenna is studied. The dielectric constant values of BST ferroelectric thin films loaded at the bottom and around the passive patch are changed. The conversion between the leading function and the reflection function of the passive patch is realized. The BST ferroelectric thin films are loaded on the bottom and all sides of the two passive patches in the three element microstrip Yagi antenna. The relative size of the dielectric constant values is changed and the pattern can be reconfigurable. The resonance depth at the working frequency is not good enough and the sidelobe level is high in the direction diagram reconfiguration. The problem is solved by slotting on the active patch. An improved reconfigurable three-element microstrip Yagi antenna is constructed.
【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】：2014
【分類(lèi)號(hào)】：TN822

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 徐從玉;廖家軒;王濱;張寶;李嶷云;張高俊;;薄膜厚度對(duì)Y摻雜Ba_(0.6)Sr_(0.4)TiO_3薄膜結(jié)構(gòu)及介電性能的影響[J];稀有金屬材料與工程;2013年S1期

，

本文編號(hào)：2350533