【正文】 畢 業(yè) 設(shè) 計(jì)（論 文） 題 目： 基于 C型槽天線的研究 1 摘 要 微帶天線由于重量輕、制作簡(jiǎn)單、成本低等諸多優(yōu)點(diǎn) ,特別適合應(yīng)用于各種移動(dòng)地面設(shè)備 ,以及飛行載體電子設(shè)備。但微帶貼片天線同時(shí)具有阻抗帶寬窄、增益低的缺點(diǎn)。這些缺點(diǎn)大大限制了它的應(yīng)用范圍。近些年來，隨著通訊設(shè)備的發(fā)展，對(duì)天線的性能提出了更高的要求，因此迫切需要對(duì)微帶天線進(jìn)行新技術(shù)的研究。 本文設(shè)計(jì)出了一種 C 型槽天線，改變了傳統(tǒng)貼片天線阻抗帶寬窄的缺點(diǎn) ,在較小體積的條件下實(shí)現(xiàn)展寬帶寬的目的。通過分析研究 C 型槽線諧振特性，選取合適的饋電方式，利用仿真軟件 HFSS 對(duì)該天線的參數(shù)進(jìn)行了仿真和優(yōu)化。研究相關(guān)幾何結(jié)構(gòu)尺寸的改變對(duì) C 型槽天線電性能的影響，探討槽天線的基本設(shè)計(jì)原理及其多頻、寬帶、小型化的設(shè)計(jì)技術(shù)。根據(jù)仿真結(jié)果最后設(shè)計(jì)出了基于 和 為工作頻率的 C 型槽天線，這兩個(gè)頻率段又分別是 WLAN 的工作頻率段，所以可以將天線適用于無限局域網(wǎng)。 關(guān)鍵詞： 微帶天線 槽天線 諧振點(diǎn) C 型槽 2 Abstract The microstrip antenna have been widely used because of their good characteristics, such as electrically thin, light weight, low cost and so on. However, the electrical performance of the basic microstrip antenna suffers from a number of serious drawbacks, including narrow band width, high feed work and low gain. As the rapidly developing of markets, suggest that the demand for microstrip antennas will increase even further. In the meantime, it calls for the development of multiband. This paper presents a Cslot antenna. It overes the disadvantage of the traditional patch antenna such as impedance bandwidth. So the purpose of exhibiting wide bandwidth can be achieved in small size. By analyzing the resonant characteristics of Cslot antenna and selecting a suitable feeding method. The parameter of the antenna is simulated using HFSS and the size of the antenna is optimized accordingly . In this paper , we study the influence on the performance according to the change of the geometric structure and discuss the principles of the antenna and the design technology of the slot with the performance of multifrequency, wideband and miniaturization. According to the simulated results ,we design the Cslot antenna based on and ,which are working frequency band of WLAN, so it can be applied to WLAN . 3 Key word： Microstrip Antenna slot antenna The antenna resonance Cslot 4 目 錄 摘 要 .................................................................................................. 1 Abstract .................................................................................................. 2 第一章 緒論 .......................................................................................... 6 微帶天線的背景及研究意義 ................................................................................... 6 微帶天線的國(guó)內(nèi)外研究進(jìn)展 ................................................................................... 6 微帶天線的定義 ....................................................................................................... 7 微帶天線的應(yīng)用 ....................................................................................................... 7 本文的工作以及章節(jié)安排 ....................................................................................... 7 第二章 天線基礎(chǔ)理論 ........................................................................... 8 天線的基本參數(shù) ....................................................................................................... 8 天線的方向特性參數(shù) ......................................................................................... 8 天線的阻抗特性 ................................................................................................ 9 天線的效率 ....................................................................................................... 9 天線的極化特性 ................................................................................................ 9 天線的有效長(zhǎng)度和有效面積 .............................................................................. 9 天線頻帶寬度 .................................................................................................. 10 傳輸線理論 ............................................................................................................. 10 傳輸線的特性參數(shù) .......................................................................................... 10 傳輸線的工作參數(shù) .......................................................................................... 10 傳輸線的工作狀態(tài) .......................................................................................... 11 微帶縫天線 ............................................................................................................. 11 微帶窄縫天線 .................................................................................................. 11 寬縫天線 ......................................................................................................... 12 第三章 微帶天線的分析方法 .............................................................. 13 傳輸線法（ TML） ................................................................................................. 13 5 腔模理論 ................................................................................................................. 14 積分方程法 ............................................................................................................. 15 微波網(wǎng)絡(luò)法 ............................................................................................................. 15 第四章 傳統(tǒng)微帶天線設(shè)計(jì) .................................................................. 16 微帶天線常用仿真軟件 ......................................................................................... 16 微帶天線的理論基礎(chǔ) ............................................................................................. 17 微帶天線的饋線 .............................................................................................. 17 微帶輻射貼片尺寸估算 ................................................................................... 17 側(cè)饋矩形微帶天線設(shè)計(jì) ......................................................................................... 17 設(shè)計(jì)要求 ......................................................................................................... 17 設(shè)計(jì)步驟 .........................................................................................