【正文】 準(zhǔn)的發(fā)展， WiMAX逐步實(shí)現(xiàn)寬帶業(yè)務(wù)的移動(dòng)化，而 3G則實(shí)現(xiàn)移動(dòng)業(yè)務(wù)的寬帶化，兩種網(wǎng)絡(luò)的融合程度會(huì)越來越高。 WiMAX(World wide Interoperability for Micrwave Access),即全球微波互聯(lián)接入。 5．移動(dòng)性：支持全 移動(dòng)網(wǎng)絡(luò) 或半移動(dòng)網(wǎng)絡(luò)。因此，無線局域網(wǎng)絡(luò)（ WLAN）就必須實(shí)現(xiàn)以下技術(shù)要求： 1．可靠性：無線局域網(wǎng)的系統(tǒng)分組 丟失率應(yīng)該低于 105， 誤碼率 應(yīng)該低于108。它是是相當(dāng)便利的 數(shù)據(jù)傳輸系統(tǒng) ，它利用 射頻 （ Radio Frequency； RF）的技術(shù)，取代舊式礙手礙腳的雙絞銅線（ Coaxial）所構(gòu)成的局域網(wǎng)絡(luò)，使得 無線局域網(wǎng) 絡(luò)能利用簡單的存取架構(gòu)讓用戶透過它，達(dá)到 “信息隨身化、便利走天下 ”的理想境界。它具有小型化、結(jié)構(gòu)緊湊、便于內(nèi)置、制作簡單、低成本、全向輻射、可同時(shí)工作在多個(gè)頻帶內(nèi)等特性，因而目前被廣泛應(yīng)用于移動(dòng)通信系統(tǒng)，尤其是移動(dòng)終端。多年來，微 帶天線因其尺寸小、重量輕、成本低和加工設(shè)計(jì)簡單等優(yōu)點(diǎn)而備受國內(nèi)天線生產(chǎn)廠商的重視。 【關(guān)鍵詞】 WLAN/WiMAX HFSS 雙頻 對(duì)稱叉子型 ABSTRACT In the current rapid development of wireless munication industry， wireless munications industry is all over the country in various fields, and more intense petition, as a mobile munication terminal in a munication system, it requires more and more antennas. With the introduction of wireless LAN standards, therefore, development of an antenna can be simultaneously applied to the plurality of band antenna design requirements bee. This paper proposes a WLAN / WiMAX applications of new munications system dualband printed antenna. Microstrip plate etching by forkshaped symmetrical radiation patch and parasitic patch, simulation designed a dualband printed antenna structure, by means of simulation software to optimize the design of the antenna, the antenna can cover , and tested it. The results showed that the test results and simulation results of the same, and have a good omnidirectional radiation characteristics in the band. The thesis is divided into five parts. First, the paper introduces the basic concepts of wireless LANs, in the understanding of the basics of wireless LAN antenna discussed the development of printing, and finally a brief description of the threedimensional simulation software used for this. Secondly, a detailed review of the basic theory of the antenna, the basic electrical parameters of the antenna elements prising the antenna feed and the like. Then, introduced the WLAN / WiMAX features and design features and design requirements dualband printed antenna. Then introduces the specific steps used in WLAN / WiMAX dualband printed antenna simulation process. Finally, the paper summarizes all the work, and the future research work done properly discussed. 【 Key words】 WLAN/WiMAX HFSS dualfrequency Symmetric fork type 目 錄 前 言 ............................................................................................................................ 6 第一章 緒論 .................................................................................................................. 7 第一節(jié) 無線局域網(wǎng) ............................................................................................... 7 第二節(jié) 印刷單極子天線 ..................................................................................... 8 第三節(jié) 雙頻及多頻天線 ..................................................................................... 8 第四節(jié) 天線設(shè)計(jì)的仿真軟件 ............................................................................. 9 第五節(jié) 本章小結(jié) ................................................................................................... 9 第二章 天線的基本理論 ............................................................................................ 10 第一節(jié) 天線的電參數(shù) ......................................................................................... 10 一、輻射功率和輻射電阻 ............................................................................ 10 二、輸入阻抗與駐波比 ................................................................................ 10 三、效率 ........................................................................................................ 11 四、方向圖和主瓣寬度 ................................................................................ 11 五、前后比 .................................................................................................... 12 六、方向系數(shù) ................................................................................................ 12 七、增益系數(shù)（ Gain） ................................................................................ 12 八、極化 ........................................................................................................ 12 九、頻帶寬度 ................................................................................................ 13 第二節(jié) 微帶天線的基本理論 ............................................................................. 14 一、微帶天線定義 ........................................................................................ 14 二、微帶天線的優(yōu)缺點(diǎn)及展寬頻帶的方法 ................................................ 14 三、天線單元的饋電方法 ............................................................................ 16 第三節(jié) 印刷單極子天線 ..................................................................................... 17 一、印刷單極子天線與微帶天線的聯(lián)系和區(qū)別 ........................................ 17 二、印刷單極子天線原理 ............................................................................ 18 第四節(jié) 本章小結(jié) ................................................................................................. 21 第三章 應(yīng)用于 WLAN/WiMAX雙頻帶印刷天線的特點(diǎn)與 HFSS軟件介紹 ....... 22 第一節(jié) WLAN/MiMAX雙頻帶印刷天線特點(diǎn) ................................................ 22 第二節(jié) WLAN/WiMAX天線的設(shè)計(jì) ................................................................ 22 第三節(jié) HFSS簡單介紹 ...................................................................................... 23 第四節(jié) 本章小結(jié) ................................................................................................. 25 第四章 WLAN/WiMAX雙頻帶印刷天 線 具體流程和仿真結(jié)果 ........................... 26 第一節(jié) 綜述 WLAN/WiMAX雙頻印刷天線的設(shè)計(jì) ..................................... 26 第二 節(jié) WLANWI\MiMAX雙頻帶印刷天線的模型構(gòu)建與仿真 ................. 26 一、天線的模型構(gòu)建 .................................................................................... 26 二、結(jié)果分析 ..............................................................................................