本論文針對應用於第五代行動通訊（5G）手持式裝置之場型可重置天線以及超高頻（UHF）射頻辨識系統近場天線進行研究。第一部分將提出以可重置功率分配電路，並與準八木天線和單極天線及寄生元件結合而形成波束切換可重置天線，其中該可重置電路可激發 6 種高增益場型，可依照當時使用情境智慧地切換選擇合適之波束方向，來滿足毫米波天線應用於手持式裝置之訊號涵蓋需求。此可重置電路不需外加匹配電路即能使所提出波束切換可重置天線在 26 ~ 30GHz 毫米波頻帶內於所有操作狀態皆有一定的頻寬，並且實測驗證整體天線輻射效果良好。本論文所提出之天線有尺寸小、高增益、高指向、低姿態及可智慧地切換波束等特性，以達到全面性的涵蓋，期能應用於第五代行動通訊手持式裝置中。第二部分則針對應用於 UHF 頻辨識系統近場天線進行研究，並整合於博弈物品中賭桌籌碼管理系統。所提出之近場天線設計可產生較強的垂直或水平方向近場磁場，並實際驗證此系統可穩定讀取大量垂直或水平緊密堆疊的物件標籤，且此天線具良好定位功能，能明確判斷各玩家分別所下注之金額。本論文提出之天線具有良好近場特性，並配合自行開發之應用程式，可快速辨識出大量緊密堆疊籌碼，能夠節省人力清點時間及避免人工計算錯誤，有效提升遊戲中荷官判賠效率，使遊戲能更順利且快速進行。

This thesis contains two parts. First part presents a pattern reconfigurable antenna operating in 26-30 GHz band. It is projected to be used on handheld devices for future 5G wireless communications. The proposed design is a multi-antenna system, which comprises a reconfigurable power divider that excites one or multiple antennas according to system’s commands. The diversified antenna excitation combinations provide various radiation patterns to meet the wideband mobile communication need of the future 5G handset. The main challenge is to maintain a proper matching condition under different excitation configurations. In the proposed design, a simple way is employed to match all cases. A total of six high-gain and directive radiation patterns is provided with a two-antenna system. The second part proposes two near field reader antennas for applications in the UHF radio frequency identification (RFID) system. Strong vertical and horizontal magnetic fields in near zones are respectively excited by those two reader antennas, so that the readable distance of the near-field tags attached on objects can be enhanced significantly. Thus, the reader antennas are capable of near-field identification and positioning applications, such as Gaming. For the gaming chip manage system, many stacked chips with tags embedded can be recognized by using the near-field reader antennas so that the manpower may be saved to significantly improve counting efficiency.

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