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研究生:許芳儀
研究生(外文):Fang-I Hsu
論文名稱:平面近場轉遠場與適用於無線區域網路的倒F天線
論文名稱(外文):Planar Near-Field to Far-Field Transformation and PIFA Antenna Suitable for Wireless LAN
指導教授:周復芳
指導教授(外文):Christina F. Jou
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:49
中文關鍵詞:近場遠場倒F天線無線區域網路
外文關鍵詞:Near-Field to Far-Field TransformationPIFAWireless LAN
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  • 被引用被引用:5
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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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