手機的日益精進，現代的手機已將越來越多功能包含在其中，特別是在高階手機的部份，全球衛星定位系統(Global Positioning System, 以下皆簡稱GPS)已成為高階手機中的基本配備。而由於GPS是以衛星通訊來收發訊號，故天線之場形必然朝向天空，而在進入車內之後，車內必然成為GPS之死角，故現在有汽車產業與手機通訊產業結合，在車內放一個含有天線之手機機座，則結合GPS功能的高階手機在車內時放上機座後，機座內的天線與手機原有之GPS頻段的天線利用耦合的方式達成資料傳輸。
　　而要對耦合強度做定性的分析，最直接的方法就是建立天線之間的等效電路。本論文主要著重於天線於近場中的耦合行為之等效模型的建立與分析，對於天線在近場下耦合強度的比較與探討，並以此建立與分析出一模型，比較模擬出的結果與利用模型造成的結果，以及比較模擬的結果與實作出來的結果。

Most cell phones are not limited to the use of voice communications. As the technology progresses, Global Positioning System (GPS), a very popular wireless communication system, will be integrated into cell phones. GPS receiver receives the signal from satellites and the cell phone hand set is unable to receive the GPS signal when users are in the car. To overcome the problem, coupling antennas are proposed to receive GPS signal obtained by the other antenna placed outside of the car.
Coupling effect influences the quality of the GPS receiving signal so the major purpose of this study is to build a model of the coupling antennas. Simulation results based on the physical model of coupling antennas are used to coupled with measured data.

[1]　C. Hoer and C. Love, “Exact inductance equations for rectangular conductors with applications to more complicated geometries,” J. Res., Nat. Bur. Stand. C., vol. 69C, no. 2, pp. 127–137, Apr.–Jun. 1965.

[2]　彭嘉美, 多頻段之小型化天線研究, 台灣科技大學學位論文

[3]　詹詩怡, 應用於無線通訊的Meander-Line天線, 台灣科技大學學位論文

[4]　M. Hamid and R. Hamid, “Equivalent circuit of dipole antenna of arbitrary
length,” IEEE Trans. Antennas Propag., vol. 45, no. 11, pp. 1695–1696, Nov.
1997.

[5]　Kurokawa, A., Sato, T. and Masuda, H. “Approximate Formulae Approach for
Efficient Inductance Extraction,” Proc. 2003 Asia and South Pacific Design
Automation Conference, 2003, pp. 143-148, Jan. 21-24, 2003

[6]　G. Zhong and C.-K. Koh, “Exact Closed-Form Formula for Partial Mutual
Inductances of Rectangular Conductors,” IEEE Trans. Circuits Syst. I, vol. 50, no. 10, pp. 1349-1353 Oct. 2003

[7]　王雅瑩, 應用於無線網路之新型雙頻開路諧振環單極天線之設計及量測,
國立交通大學學位論文

[8]　Tee G. Tang, Quang M. Tieng, and Moms W. Gunn, “Equivalent Circuit of a
Dipole Antenna Using Frequency-Independent Lumped Elements,” IEEE Trans.
Antennas and Propagation., vol. 41, no. 1, pp. 100–103, Jan. 1993.

[9]　D. M. Pozar, “Microwave Engineering” 3rd Edition, John Wiley & Sons, Inc. 2003.

[10]　Robert S. Elliott, “Antenna Theory and Design” Revised Edition.
Wiley-Interscience: Hoboken, New Jersey, 2003.

[11]　J. D. Kraus and R. J. Marhefka, “Antennas: for All Applications,” 3rd Edition, McGraw-Hill, 2003.

[12]　Paul, C.R.: “Introduction to electromagnetic compatibility,” Wiley, New York, 1992.

[13]　C. Caloz and T. Itoh, “Electromagnetic Metamaterials: Transmission Line
Theory and Microwave Applications,” John Wiley & Sons, Inc. 2006.

[14]　Constantine A. Balanis, “Antenna Theory”, 2nd Edition, John Wiley & Sons, Inc. 1997

[15]　Warren L. S., Gray A. T., “Antenna Theory and Design”, 2nd Edition, John Wiley & Sons, Inc. 1998

[16]　 K. C. Gupta, R. Garg, I. Bahl, and P. Bhartia, “Microstrip Lines and
Slotlines,” 2nd Edition, Artech House, Boston London, 1996.

[17]　D. K. Cheng, “Field and Wave Electromagnetics,” 2nd Edition, Addison-Wesley Publishing Company, Inc., 1989.