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    Title: 利用3D列印技術之透鏡天線設計;Design of Lens Antenna Using 3D Printing Technology
    Authors: 吳欣燕;WU, SIN-YAN
    Contributors: 電機工程研究所
    Keywords: 透鏡天線;3D列印技術;菲涅爾透鏡;Lens Antenna;3D printing technology;Fresnel lens
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 電機工程研究所
    Abstract: 本論文利用幾何光學原理設計透鏡天線,以3D列印技術列印。透鏡天線在同波束寬度下具有大範圍角度的掃描能力,使場型旁瓣與後瓣明顯較低,可實現增益高的指向性天線。本文使用2.4 GHz與24 GHz兩頻率之天線,搭配光固化立體成型之3D列印技術列印透鏡結構,分析訊號行進球面鏡經由透射後之路徑,將能量會匯聚於天線,其增益結果皆有上升1~2 dB。並且製作三種封裝透鏡天線,讓天線本身有封裝外殼保護,亦可以使天線訊號接收較不受影響,其三種實際量測增益結果皆有增加之趨勢,也結合雷達系統量測,結果顯示功率提升。接著以菲涅爾透鏡設計方式,降低原設計透鏡之重量,令透鏡以另一種形狀呈現,實驗結果與原本未加入透鏡之天線亦有1.3 dB之增益。最後由於模擬結果與實際量測結果有所差異,使用探針掃描顯微鏡掃描透鏡,且將差異代入模擬,使模擬更貼近實際量測結果。
    This thesis focuses on the designs of lens antenna using 3D printing based on the geometric optics methods. Comparing with the conventional antennas, the lens antenna can provide wide range of scanning capabilities and higher gain while side lobes and back lobes are relatively smaller. The lens structures designed for 2.4 GHz and 24 GHz are fabricated by stereolithography 3D printing technology. The energy will be converged on the antenna through the lens, resulting in 1 ~ 2 dBi gain imrpovement. In addition, the lens integrated with the antenna packaging cap is also proposed in this work. Three different packaging caps are investigated, and the measurement results show that the gains from all three cases are slightly improved. The final topic is to design the Fresnel lens, aiming for the weight and size reduction comparing to the conventional lens. The gain difference with and without lens is 1.3 dBi. To verify the fabrication precision, the scanning probe microscopy is applied to scan the surface profile of the lens. With this real fabricated surface profile,the post simulation is thus conducted to compare the measurement results.
    Appears in Collections:[Department of Electrical Engineering] thesis

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