新近推出的各式行動裝置平台，像是平板電腦、智慧型手機等，皆須整合多種無線通訊協定，沿生內藏式多頻段操作的天線需求，本篇論文中，提出三款應用於不同行動平台之內藏式天線設計。並且將天線結構加以解析，以達到系統化分析及提供調整機制之需求。
本論文的第一部分，為一應用於無線接取器之WLAN雙頻帶四天線系統，天線結構由倒F天線與迴圈天線組合而成，整體結構為全平面形式，符合實際內藏應用。為搭配MIMO技術，我們將單一天線各別擺置系統平台之四個角落，天線之間的耦合量小，且不影響彼此的操作模態，而利用輻射場型評估此四天線系統之分集效能，也顯示有良好的效果。
第二款設計為應用於10吋平板之耦合饋入式LTE全頻帶天線設計，裝置於10吋平板電腦平台上，單一天線占用面積為40 × 10 mm2，整體結構為全平面形式。天線可涵蓋LTE/WWAN八個頻帶，其低頻模態是由耦合饋入方式。可藉由調整饋入帶線與由地板延伸之寄生元件的間距，產生寬頻模態響應；而高頻頻段則是由寄生元件與饋入帶線之高頻模態響應合成，透過實作及量測，也驗證此天線在4G頻帶內皆有良好的匹配以及輻射效能。
第三款天線則是適用於各式尺寸平板之LTE全頻帶IFA天線，天線尺寸為53.5 × 10 mm2，其結構為全平面形式，所採用之系統平台尺寸為170 × 100 mm2，此天線分別針對低、高頻帶做設計，且頻帶之間擁有相當良好的隔離度，具有良好的可調整性，且天線在7吋系統平台上具有良好的匹配特性與輻射特性，該天線設計也可適用於其他尺寸之通訊產品。

Modern mobile devices, such as tablet PCs and smart phones, need to be integrated with various kinds of communication protocols. In this paper, three kinds of internal antenna designs for different application platforms are proposed. By decomposing the antenna structure and performing parametric analyses, systematic design and characteristics tuning methods can be acquired.
First part of this paper is a dual band WLAN 2.4/5 GHz four antenna system for access point devices. The antenna design integrates on inverted-F antenna and a loop antenna. The antenna structure is planar, which is suitable for practical applications. To support MIMO uses, we arrange the four element antennas at corners of the system platform. The couplings between antennas are small and each element antenna retains original performance. Measured fields are used to evaluate and verify that this four-antenna system's superior diversity performance.
In the second part, an LTE/WWAN antenna design for 10-inch tablet is proposed. The antenna is planar and its footprint is 40 × 10 mm2 only. By employing a coupled-feed and adjusting the gap between the feeding strip line and the parasitic element extended from the ground plane, a broad operation band can be achieved in the lower LTE band. The higher band is generated from higher resonant modes of the feeding strip line and the parasitic element. Through fabrication and measurement, good matching and radiation performance features are validated.
The third part proposes an LTE/WWAN band antenna used for 7 inch tablet. The antenna size is 53.5 × 10 mm2. The lower and higher bands are designed respectively. With good isolation performance between the two bands, ease of tuning can be achieved. Because of good operation features of the proposed design on the 7 inches platform. This antenna is also suitable for other mobile handset with different size.

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