本論文研究主題為「基於3D列印之振幅與相位可調Ka頻帶透射陣列天線」。低軌衛星通訊產業日漸崛起，將可解決5G通訊覆蓋率不足的問題，因此選擇Ka頻段之衛星通訊天線進行設計。目前在天線的設計上大部分採用印刷電路板為主，但近年來3D列印技術的成熟，在耐用度及材料強度上皆有不錯的表現，結構設計上也較印刷電路板簡單，且單一製作的成本也相對印刷電路板低，因此吾人採用3D列印製成的方式進行天線設計。
在陣列天線中具有高指向性和低旁瓣位準可提高通信系統的可靠性和有效性。所以為了獲得較理想的波束指向及旁波瓣（Side lobe, SL），本研究透過3D列印印製多層架構，使單元具備振幅可調及相位可調之能力。在設計上分為兩部分進行設計，首先，振幅調控單元設計中分為四種不同型式，使穿透功率的振幅可在0.37-0.99之間變化，且每一型式之單元調控過程均可達成小於 ±15°之相位波動變化；其次，相位控制單元則透過不同介質厚度的中心層和兩個線性錐形匹配層組成，使相位可涵蓋完整 360°且 |S21| 均保持低於-0.25 dB。在實作量測時因計算誤差只使用相位可調之單元，完整整合將列為未來工作。
最終在中心頻率38 GHz實現以1268個單元組合而成直徑為13 λo（102.6 mm）的3D列印透射陣列天線，其量測最高增益為26.3 dBi，孔徑效率為23%。

This thesis develops a Ka-band amplitude and phase controllable transmitarray using 3D-printing technology. The rise of the low-orbit satellite communication industry has drawn considerable attention, which may capable of improving the coverage of current 5G system. Currently, the antennas are mostly manufactured by using the printed circuit board technology (PCB), which suffer from drawbacks including robustness and cost. To address the problem, 3D printed structures featuring high durability, low cost, and flexibility in manufacturing can be adopted.
The performance of an array antenna can be improved by enhancing the directivity and suppressing the sidelobe level (SLL). In this thesis, we propose a 3D printing transmitarray that is capable of adjusting its amplitude and phase distributions. The design is divided into two parts. Firstly, by using four distinct types of amplitude control units, the level of the transmitting power can be tuned from 0.37 to 0.99 with a limited phase fluctuation (±15° at maximum). Secondly, the phase control unit is implemented by the combination of a central layer with different dielectric thicknesses and two linearly tapered matching layers. The proposed design covers a complete 360°, while the value of |S21| is smaller than -0.25 dB. Due to miscalculation, there are only phase control unit is used in the final implementation verification. The whole integration will be a future work.
Finally, a 3D printed transmitarray with a diameter of 13 λo (102.6 mm) is fulfilled and experimentally validated by combining 1268 elements at a center frequency of 38 GHz, with a maximum gain of 26.3 dBi and an aperture efficiency of 23%.

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