本篇論文提出了三款行動通訊使用的槽孔天線設計，利用槽孔天線本身容易與金屬結構結合的特點，以簡單幾何架構配合集總元件，達到寬頻效果，可符合目前行動裝置金屬機身的設計趨勢。
論文中第一款設計為 LTE/WWAN 與 5G 通訊之全頻帶槽孔天線，可應用於 5.5吋手機平台，其結構直接施作於金屬背蓋上。LTE高頻天線為一雙端開路的槽孔，能提供三個模態，進而涵蓋 1710-2690 MHz 與3400-3600 MHz 頻帶。LTE 低頻天線為一單端開路槽孔，提供四分之一波長共振模態，可涵蓋 698-960 MHz 頻帶，槽孔內有一長條金屬，其作用為利用其結構改善阻抗匹配；天線饋入方式是採用高、低頻分離的雙饋入型式，以利於支援載波聚合技術；此外也可以分別調整個別槽孔的響應。經由實作及量測，驗證此款設計在 LTE 與 5G 頻帶有良好的模態及輻射效能。
第二款天線設計為應用於 5.5 吋金屬背蓋手持裝置的 LTE/WWAN 全頻與 5G通訊之槽孔天線，其槽孔結構簡單，但可提供了三個不同共振路徑的模態給 LTE 低、高頻與 5G 頻帶使用。饋入方式為單饋入，但分開低、高頻兩個不同路徑進行匹配電路設計，再回復為單一饋入至槽孔天線，其特點為低、高頻的匹配網路由集總元件來阻隔另一頻帶的訊號，除匹配本身的路徑之外，也可藉達到分頻的效果；經由實作及量測，驗證此款設計有良好的模態及輻射效能。
第三款天線設計為應用於金屬機殼筆電之 LTE 全頻帶槽孔天線，其結構採用一個單端開路曲折型槽孔，提供 LTE 低、高頻模態。饋入方式為單饋入至槽孔天線，前端加入匹配電路設計。吾人亦利用此設計作成雙天線的型式，分別置於筆電平台上緣及下緣，量測所得分集效果與隔離度都有不錯的表現，也有良好的輻射效能。

This thesis presents three slot antenna designs since the slot configuration is compatible with metal surfaces antennas. The slot structure can be conveniently incorporated with the metal frame, which is a welcome feature for trendy mobile device designs.
The first design is a metal body-integrated T-shape slot antenna for LTE/WWAN and 5G uses on handsets. The slot is directly etched on the metal frame. It composes three parts: LTE low band antenna, LTE high band antenna and feeding network. LTE lower band antenna is a quarter-wavelength slot covering the 698-960 MHz band. An internal metal strip is placed in the low band slot and improves the matching. The high band antenna is made with a dual-end open slot that provides three resonance modes. Two are quarter-wavelength modes and the other is a half-wavelength mode. They cover the 1710-2690 MHz and 3400-3600 MHz band. The feeding network contains two feeds to facilitate the carrier aggregation technique. Through fabrication and measurement, good matching and radiation performances are validated.
The second design is an open-ended slot for LTE/WWAN and 5G uses on handsets of different sizes. The antenna structure is a quarter-wavelength slot. The feeding network is comprises matching circuits made of lumped elements to achieve broadband response. The feeding network also functions as a diplexer. Lumped element values can be adjusted to achieve matching and frequency dividing performance.
The third part is an LTE/WWAN meandered slot design for laptops with metal bodies. The antenna feed is a 50 Ohm microstrip line embedded with a low-band matching network. This antenna is combined with another LTE antenna to from a two-antenna system. Dissimilar antenna configurations are employed to reduce coupling. Its superior diversity performance is validated with measured envelop correlation coefficients, which confirm that the proposed design is suitable for LTE MIMO uses.
Key words: slot antennas, MIMO antennas, handheld antennas, long term evolution, miniaturized antennas

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