【正文】 關(guān)鍵詞： 微帶天線 槽天線 諧振點 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 微帶天線的國內(nèi)外研究進展 ................................................................................... 6 微帶天線的定義 ....................................................................................................... 7 微帶天線的應用 ....................................................................................................... 7 本文的工作以及章節(jié)安排 ....................................................................................... 7 第二章 天線基礎理論 ........................................................................... 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)絡法 ............................................................................................................. 15 第四章 傳統(tǒng)微帶天線設計 .................................................................. 16 微帶天線常用仿真軟件 ......................................................................................... 16 微帶天線的理論基礎 ............................................................................................. 17 微帶天線的饋線 .............................................................................................. 17 微帶輻射貼片尺寸估算 ................................................................................... 17 側(cè)饋矩形微帶天線設計 ......................................................................................... 17 設計要求 ......................................................................................................... 17 設計步驟 ......................................................................................................... 18 設計結(jié)果 ......................................................................................................... 18 第五章 C型槽天線的設計 ................................................................. 25 基于 WLAN C 型槽天線的設計 ........................................................... 25 改進饋電后的 C 型槽天線 .................................................................................... 29 基于 WLAN 雙開 C 型槽天線的設計 ........................................................ 34 基于 WL