應用於無線通訊產品之印刷式倒F型天線陣列切換系統實作與效能分析

The analysis and Implementation of Switched-Beam Inverted-F Array Antenna for Wireless Communications

謝益豪(Yi-Hao Shie)

指導教授 ： 林信標

國立臺北科技大學/機電學院/電腦與通訊研究所/碩士(2005年)

https://doi.org/10.6841/NTUT.2005.00179

摘要

由於室內環境多重路徑及共通道干擾的影響，使得無線通訊系統整體效能及容量下降。另外，為因應小型化且多功能產品的需求，其內部電路也必需相對地縮小，在此前提下的通訊品質與效能也相對降低，故本論文方向乃是實作應用於2.4GHz無線通訊產品之小型化印刷倒F式(Inverted F)智慧切換天線。首先利用電磁模擬軟體模擬及實作單根倒F式，接著以陣列天線理論進行1x4陣列天線擺設，並利用巴特勒矩陣( Butler Matrix )輸出於各天線間相位差特性作陣列天線主要波束的切換，經量測其場型確實能切換4個固定方向之主波束。
另外，為符合一般室內通訊產品的需求，我們將實作之倒F式智慧型陣列天線，擷取其場型資料且輸入一室內環境模擬軟體，與全向性(omni-directional)天線於某一環境的涵蓋率及效能比較後，確實能增加室內環境接收場強及有效地減少因多重路徑引起的RMSdelay，進而提升效能及品質，未來更冀望應用於實際產品中，以達到無線通訊產品之高通訊品質優點與價值。

關鍵字

波束切換 ； 智慧型天線 ； 倒F式天線 ； 巴特勒矩陣

並列摘要

In indoor environment, the causes of degradation of wireless communication system are due to multi-path and co-channel interference. Besides, for the demands of multi-functions and compact size, the inner circuits are reduced relatively which cause the degradation of the circuit efficiency and communication quality. In this thesis, we implement the compact printed inverted-F switched-beam smart antenna for 2.4GHz wireless communications. We use IE3D to implement the single inverted-F antenna and exploit array antenna theory to accomplish 1x4 inverted-F array antenna. Besides, the Butler Matrix is used to cause the phase difference of each antenna element and to form the four-beam switch-beam smart antennas.
For validating the capability of using the composed inverted-F smart antenna in the indoor wireless communications, the pattern data of the switch-beam inverted-F smart antenna are exported into propagation software and compared with omni-directional antenna for coverage and performance in the same indoor environment. As the result was shown, the switched-beam inverted-F smart antenna can increase the received power and reduce the root mean square(RMS) delay spread value hence improves the communication performance and coverage.

並列關鍵字

switched-beam ； smart antenna ； inverted-F antenna ； Butler Matrix

參考文獻

[11] 鐘孟霖，無線區域網路的波束切換天線系統之模擬與實現，碩士論文，國立台灣大學電信工程研究所，台北，2004。

[1] Angeliki Alexiou , Bell Laboratories , Lucent Technologies Martin Haardt , Ilmenau University of Technology ‘Smart antenna technologies for future wireless systems_trends and challenges’ IEEE Communication Magazine, pp.90-97.

[6] Tayeb.A.Denidni and Taro Eric Libar , “Wide Band Four-Port Butler Matrix for Switched Multibeam Antenna Arrays”IEEE 2003 International Symposium on Personal , Indoor and Mobile Radio Communication Proceedings ,PP.2461-2464

[7] A. Angelucci, P. Audagnotto, P. Corda, P. Obino ,F. Piarulli and B. Piovano, “High performance microstrip networks for multibeam and reconfigurable operation in mobile-radio systems” IEEE Global Telecommunications Conference , vol.3, pp.1717-1721, 1994.

[8] R. Comitangelo, D. Minervini and B. Piovano , “Beam forming networks of optimum size and compactness for multibeam antennas at 900MHz ” IEEE Antennas and Propagation Society International Symposium, vol.4,pp.2127-2130, 1997.