本研究提出了應用於Ka頻段低軌衛星地面接收站的雙極化陣列天線設計，用於地面接收站的下行通訊，頻段範圍為17.7GHz至20.2GHz，該天線採用探針饋入的雙極化微帶天線作為基礎單元。首先介紹改善隔離度的L型結構和拓寬使用頻寬的殘段設計。接著，以不同天線單元的排列方式，對其性能進行比較，找到效果最佳的為循序旋轉45度的天線單元排列方式。將天線單元組成不同維度的陣列，並對其性能進行評估：2x2陣列在θ=0°時，增益可達11dBi；8x8陣列在θ=0°時，增益可達22dBi。最後在8x8陣列架構下，對各單元進行相位控制，模擬波束掃描。以增益下降不超過半個功率（即保持在19dBi以上）為基準，8x8陣列可以達到±55°的掃描範圍。

This study proposes a dual-polarized array antenna design for Ka-band low Earth orbit (LEO) satellite ground stations, intended for downlink communication. The frequency range is 17.7 GHz to 20.2 GHz. The antenna utilizes a probe-fed dual-polarized microstrip antenna as the basic unit. First, the design introduces an L-shaped structure to improve isolation and the stub of the patch to widen the operational bandwidth. Next, different antenna element arrangements are compared to identify the best performance, with a sequentially rotated 45-degree element arrangement showing the optimal results. The antenna elements are then assembled into arrays of different dimensions, and their performance is evaluated: the 2x2 array achieves a gain of 11 dBi at θ=0°, while the 8x8 array achieves a gain of 22 dBi at θ=0°. Finally, phase control is applied to each element in the 8x8 array to simulate beam scanning. Maintaining a gain drop within half-power (i.e., above 19 dBi), the 8x8 array can achieve a scanning range of ±55°.

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