# 臺灣博碩士論文加值系統

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 本論文分為兩部分，第一部份探討平面近場電場轉換遠場場型，第二部份為設計適用於無限區域網路的平面倒F天線。 第一部份利用等效磁流法的方法。過程中利用到等效原理及映像法理論，將天線等效成磁流源，使其分佈於等效磁流面上，所得到的等效磁流就可以用來決定遠場場型。經由適當的推導，利用動差法 ( Method of Moment ) 將電場積分公式轉成矩陣形式，最後用共軛梯度法 ( CGFFT )來解矩陣，就可以得到等效磁流解，遠場場型也就可以獲得。最後，我們選取極短電偶極陣列天線來測試此過程的準確度及可行性。結果顯示在一定的範圍內，遠場準確度能到 。 第二部份利用Ansoft HFSS軟體設計一個適用於無限區域網路的天線。此天線為立體的倒F天線，因為無限區域網路限制其高度要在3mm附近，因此我們用一個簡單的方法來增加頻寬，即多加一個寄生銅片。結果顯示多加一個寄生銅片能使頻寬符合所求。
 This thesis included two topics . In the first part , we discussed the planar near electric field to far field transformation . In the second part , we designed planar inverted-F antenna ( PIFA ) suitable for Wireless LAN . The first part is fulfilled by using equivalent magnetic current approach . In the process , utilizing equivalence principle and image theory could replace antenna with equivalent magnetic currents , and the equivalent magnetic current plane has to encompass the antenna under test . From certain derivations , the equivalent magnetic currents could be obtained by method of moment ( MOM ) and conjugate gradient method with fast Fourier transformation ( CGFFT ) . Then , the equivalent magnetic currents could determine the far field patterns . In the second part , we utilized a simulation software , named Ansoft HFSS , to design a planar inverted-F antenna suitable for Wireless LAN in ISM band . Due to the limit of the specification , the height of antenna has to be below 3 mm . Therefore , we used a simple way to promote the bandwidth of the antenna , adding a parasitic element ( PE ) to the antenna . At last , the results reveal that adding a PE certainly increased the bandwidth of the antenna .
 Contents： Chinese abstract ---------------------------------------------------------------i Abstract-------------------------------------------------------------------------ii Acknowledgement-------------------------------------------------------------iii Contents-------------------------------------------------------------------------iv List of Figures and Tables----------------------------------------------------vi First part：Planar Near-Field to Far-Field Transformation Using an Equivalent Magnetic Current Approach Chapter 1: Introduction-------------------------------------------------------------------1 1.1 : Motivation of this part--------------------------------------------------1 1.2 : Organization of this part ------------------------------------------------1 Chapter 2: Theory and Numerical Analysis--------------------------------------------2 2.1: The equivalent principle -------------------------------------------------2 2.2: Image theory---------------------------------------------------------------2 2.3: The general problem------------------------------------------------------5 2.4: Electric field integral equation-------------------------------------------7 2.5: Method of Moment --------------------------------------------------------8 2.6: Conjugate Gradient Method with fast Fourier transform-------------11 2.7: Far field obtained by equivalent magnetic current approach --------13 2.8: Analytical near field and far field equations obtained from the infinitesimal short dipole array -----------------------------------------13 Chapter 3 : Comparison of numerical and analytical results -----------------------16 3.1 : M N on S2 versus P Q on S3----------------------------------16 3.2 : S1 size versus S2 size ( suppose S2 = S3 )---------------------------19 3.3 : S2 size versus S3 size---------------------------------------------------22 3.4 : D ( distance between S2 and S3 )--------------------------------------24 3.5 : d ( distance between S1 and S2 )--------------------------------------27 3.6 : Conclusion ---------------------------------------------------------------30 Chapter 4: Introduction-----------------------------------------------------------------------31 4.1 : Motivation of this part ---------------------------------------------------31 4.2 : Organization of this part--------------------------------------------------31 Chapter 5: Antenna Design--------------------------------------------------------------------32 5.1 The evolution of PIFA------------------------------------------------------32 5.2 The radiation pattern of PIFA---------------------------------------------34 5.3 2.44GHz PIFA---------------------------------------------------------------38 5.4 Comparison of simulation and measurement ----------------------------41 5.5 Conclusion--------------------------------------------------------------------42
 References :[1] T. K. Sarkar , S. Ponnapolli , and E. Arvas , “ An accurate efficient method of computing a far-field antenna patterns from a near-field measurements , “ in Proc. Int. Conf. Antennas Propagat. , Dallas , TX , May 1990 .[2] S. Ponnapolli , T. K. Sarkar , and P. Petre , “Planar near-field to far-field transformation using an equivalent current approach , “ IEEE Trans. Antennas Propagat. Vol AP-40 , pp.1348-1356 , Nov .1992 .[3] Constantine A. Balanis , Antenna Theory Analysis and Design , John Wiley & Sons , New York , chapter 4.2 , pp133-138 .[4] R. F. Harrington , Field Computation by Moment Method , Malabor : Robert E. Kreiger Publishing , pp1-40 , 1968 .[5] T. K. Sokar and E. Arvas , “ On a class of finite step iterative methods ( conjugate directions ) for the solution of an operator equation arising in electromagnetics ,” IEEE Trans. Antennas Propagat. Vol . AP-33 , pp. 1058-1066 , Oct. 1985 .[6] M. F. Catedra , R. P. Torres , J. Basterrechea , and E. Gago , The CG-FFT Method : Application of Signal Processing Techniques to Electromagnetics , Artech House , pp112-136 , 1995 .[7] P. J. Davis , Circulant Matries , John Wiley & Sons , pp72-90 ,New York , 1979 .[8] Rong-Tsann Wong , “ Planar Near Field to Far Field Transformation Using Equivalent Magnetic Current Approach “ , June 2000 , Hsinchu , Taiwan , Republic of China .( 碩士論文 )[9] R. L. Burden and J. D. Faires , Numerical Analysis , pp 205-210, PWS Publishing , 1993 .[10] Fujimoto K. Henderson A. , Hirasawa K. , and James J. R. 1987, “ Small Antenna “ Research Studies Press , England and J. Wiley & Sons , pp116-149, USA .[11] K. Hirasawa and M. Haneishi (Ed.) ,1992, “ Analysis , Design and Measurement of Small and Low-Profile Antenna “ , Artech House , Norwood , USA .[12] Kikuo Tsunoda , Tokio Taga , “ Analysis of Planar Inverted F Antenna Using Spatial Network Method “ , Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90''s. Digest.[13] Pekka Salonen , Mikko Keskilammi ,and Markku Kivikoski , “ Single-Feed Dual-Band Planar Inverted-F Antenna with U-Shaped Slot “, IEEE Transations On Antenna Propagation , Vol , 48, No 8. , August 2000 .[14] V. Stoiljkovic and G.. Wilson , Sigma Wireless (UK) Ltd, UK, “ A Small Planar Inverted-F Antenna With Parasitic Element For WLAN Application “ , 10th International Conference on Antenna and Propagation , 14-17 April 1997 , Conference Publication No.36 @ IEE 1997 .[15] R. F. Harrington , Time-Harmonic Electromagnetic Fields , International Editions 1993 by McGraw-Hill , pp 103-106 , Inc.
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 1 手機用之平面倒F天線設計 2 應用於無線區域網路802.11a/b/g之天線設計與研究 3 智慧型天線對無線區域傳輸特性之改進研究 4 含藍牙功能之整合式家庭劇院 5 微小化具有GPS及ISM雙頻段倒F型天線 6 近場聲音全像術應用於噪音源的辨識 7 平板受聲源作用之振動與輻射聲場分析 8 寬頻天線之開發及其在天線量測場之應用 9 人體組織與天線間遠場電磁輻射效應之研究 10 以Gerchberg-Saxton方法和近遠場二階相關性質重建被毛玻璃遮蔽的物體影像之研究 11 具全金屬機殼行動通訊裝置之高增益天線設計 12 電磁雜訊輻射之近場分析與偵測技術研究 13 二維麥克風陣列應用於遠場和近場之方位估測 14 近場與遠場二倍頻顯微鏡的研究與應用

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 1 寬頻與超寬頻的槽孔和單極平面天線之研究 2 38-GHz寬頻多指向器印刷式八木天線設計 3 利用短基線場檢測GPS天線相位中心之研究 4 包含饋入網路之平面天線新型設計 5 具波束掃瞄能力之新型毫米波折疊式微帶反射陣列天線 6 主動陣列天線暨天線設計應用於28GHz視訊系統 7 無線網路卡印刷天線暨低溫共燒陶瓷高頻轉接器與濾波器設計 8 包含整合微帶天線之新型單平衡自振式混頻器及其設計 9 新式平面型倒F天線的研發 10 應用多埠孔隙耦合微帶天線之二維主動放大天線陣列設計 11 應用於手持式裝置之多頻段耦合式平面倒F天線設計 12 基地台陣列天線之設計與切換波束式智慧型天線之研製 13 應用於LTE/WWAN系統之印刷式倒F型天線與耦合型天線差異分析研究 14 利用碎形特徵設計且以印刷技術製造之RFID標籤天線 15 智慧型天線系統於遠近迴響傳播通道模型之效能評估

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