隨著科技日新月異，現行的行動通訊裝置如穿戴式設備、平板電腦、智慧型手機和筆記型電腦等，均朝向輕薄短小的設計概念來發展，因此設計微型化天線乃是相當關鍵的研究議題。本論文係針對不同無線通訊系統之需求，來研製微型化近場通訊天線、結合近場通訊天線與無線充電之應用、以及手挽穿戴式天線之設計，以達成內建至行動裝置中。此外，針對第五代行動通訊之應用，亦開發了波束可重置天線。
首先，本論文提出可應用於手持式裝置之近場通訊天線整合無線傳能線圈之設計，其中探討了易於整合至手持式裝置中之PCB共平面設計，並且於裝置與天線之間置入一鐵氧體片，以避免手持式裝置金屬部分影響天線之效能。本論文第二部分提出一個用於平板電腦之近場通訊天線的新穎架構，此平板電腦之環境為窄邊框與全金屬背蓋之設計，而環形天線的兩面具有鐵氧體片來實現小型化之設計。本論文第三部分提出一個緊湊的ISM 與GPS雙天線設計，可內建於一個腕帶式的無線通訊設備，並且腕帶上具有NFC功能。這些天線使用PC與ABS共同混合的材料做為基材，在不規則的塑料上來製作天線。最後，本研究提出一個可安裝於第五代行動通訊智慧型手機之毫米波可重置天線，應用單一傳輸線實現可重置匹配電路，使可重置天線在所有的操作模式下皆有寬頻響應，可包含36~40GHz 第五代行動通訊頻帶。

Due to the rapid advance in science and technology, many portable devices such as wearable devices, tablet computers, smart phones and laptop computers are required to have compact sizes. Thus, antennas that meet both radiation performances and space requirements are quite critical for those devices.
To tackle various demands for present wireless communication systems, miniature NFC antenna, NFC antenna integrated with a wireless charging coil and a wrist-worn antenna design with different operation features to be embedded into portable devices are proposed in this dissertation. Besides, a pattern reconfigurable antenna is also investigated and developed for the fifth generation (5G) mobile communication applications.
First, a combination of the NFC antenna and Qi wireless charging coil for mobile devices is proposed, including NFC and wireless charging coil design, analysis and measurement. Moreover, the PCB coplanar design is employed to be embedded into mobile devices. A ferrite sheet between the antenna and nearby metal parts is added to reduce eddy currents induced on the metal. Secondly, an NFC antenna design for a tablet PC is proposed. This tablet PC has a narrow border and full metallic back-cover.
A miniaturized loop antenna design is achieved by attaching ferrite sheets on both sides of the loop antenna. The ferrite sheets may reduce eddy currents induced on the adjacent metallic back-cover by the loop antenna to improve the communication range of the NFC. In the third part, a compact monopole and inverted-F antenna design for 2.4GHz ISM band and GPS operations together with an NFC design suitable to be embedded within a wrist-worn wireless communication device is presented. Those antennas are fabricated on a PC and ABS blend substrate with a three-dimensional etching process for irregular plastic materials.
Finally, a pattern reconfigurable antenna operating in the 36~40 GHz band is
presented. 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 handsets.

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