以碎型特徵作玻璃上數位電視平面天線之設計

本論文研究的目的,在於利用碎型特殊的特性,來設計放在玻璃上的數位電視接收天線. 碎型的產生方式是採用一個基本圖形 (Generator)依照一定的規則在不同位置不斷反覆產生不同大小的基本圖形而產生. 這樣的圖形構成方式已經被用來塑造描述在大自然中存在的一些複雜的物體, 例如天空中的雲以及海岸線的輪廓等等. 而此種碎型構圖方式之填滿面積的特性,可以用來設計小型化的天線. 同時, 碎型的自我相似特性使它特別適合用來設計多頻或寬頻的天線. 在本論文中, 數個 dipole 天線依照碎型概念被設計出來並且針對該設計來做分析與研究. 在第一個天線的設計中, 利用一個 UHF Balun 連接設計出來的天線以作為75 轉 300 ohm 阻抗的匹配. 所有量測的資料都是在該 Balun 被連接的狀態下量測所得. 同時也列出並討論此天線設計模擬的結果. 在第二個天線的設計中, 該 Balun 被整合進天線的設計. 主要的目的為提高整合度並減少天線組成元件的數目, 成本, 以及連接介面的衰減. 在第三個天線的設計中, 我們試著進一步縮小天線的尺寸高度以及全部的金屬銅所佔的面積以達到較佳的市場接受度. 最後, 我們分析並比較三個天線的性能與特性. 從模擬與實做的結果來看, 我們成功的運用了碎型的觀念,設計了三個可以成功接收數位電視訊號的接收天線. 然後我們利用這些設計的經驗與結果, 我們將擁有不同的介質常數與厚度的玻璃與我們所設計的天線與結合成為我們設計的第四支天線. 這些獨特並且特殊的碎型特性幫助我們在很短的時間內設計出可用來接收數位電視訊號的接收天線. 我們同時也看到了將這個天線設計在市場上以很低的成本來量產的可能性.

關鍵字

碎型；玻璃上；碎型樹

並列摘要

The major purpose of this research is to design a DTV reception antenna on glass by taking advantages of some unique features of fractal geometry. Fractal geometry involves a recursive generating methodology that results in contours with infinitely intricate fine structures. This geometry, which has been used to model complex objects found in nature such as clouds and coastlines, has space-filling properties that can be utilized to miniaturize antennas. In addition, the self-similarity properties of fractals make them especially suitable to design multi-band or wideband antennas. In this thesis, several dipole antennas are designed and investigated based on the Fractal construction approach. In the first design, one UHF Balun is attached to the antenna for 75ohm to 300ohm impedance matching. All the measured data is gained when the Balun is attached. Simulation results is also shown and discussed. In the second design, we integrate the Balun into the antenna design. The goal is to increase the integration and to minimize the component count, cost and interconnection attenuation. In the third design, we try to further minimize the antenna’s length and the overall copper areas for better commercial adoption. Finally, three antennas’ performances are compared and analyzed. From the simulation and experimental results, we have concluded that three working DTV reception antennas are successfully designed by the concept of fractal antenna engineering. By taking advantages of these design experiences, we implement the antenna design onto a glass which has different dielectric constant and material width as our fourth antenna design. We can see those unique fractal features are of great help for us to design a DTV reception antenna in a really short period of time. We have also seen the possibility to commercialize this DTV antenna design with possibly lowest cost on the marketplace.

並列關鍵字

Dipole ； Fractal ； Fractal tree ； On-Glass

參考文獻

[1] Douglas H. Werner and Suman Ganguly, “An overview of Fractal Antenna Engineering Research,” IEEE Antennas and Propagation Magazine, Vol.45, No.1, February 2003 page(s): 38-57

[2] Steven R., “A Comparison of the Resonant Properties of Small Space-filling Fractal Antennas,” IEEE Antennas and wireless propagation letters, Vol. 2, 2003 page(s): 197-200

[3] John P. Gianvittorio and Yahya Rahmat-Samii, “Fractal Antennas: A Novel Antenna Miniaturization Technique, and Applications,” IEEE Antenna’s and Propagation Magazine, Vol. 44, No. 1, February 2002 page(s): 20-36

[4] M.Sindou, G. Ablart and C. Sourdois, “Multiband and wideband properties of Printed Fractal Branched Antennas,” Electronics Letters, Vol. 35, No. 3, 4th February 1999 page(s): 181-182

[5] Hani Ghali and Tarek A. Moselhy, “Miniaturized Fractal Rat-Race, Branch-Line, and Coupled-Line Hybrids,” IEEE Transactions on Microwave Theory and Techniques, Vol. 52, No.11, November 2004 page(s): 2513-2520

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以碎型特徵作玻璃上數位電視平面天線之設計

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