本論文第一部分，提出一款操作頻段可重置天線的解決方案，以達到天線寬頻操作的效能，該設計實現於一USB dongle尺寸接收機上，可接收VHF及UHF的數位電視廣播頻段。利用射頻切換器與阻抗匹配技術將數位電視廣播的寬頻波段分成四個子頻帶，由接收機的IO控制埠進行頻段的選擇，系統廠商可依應用需求選擇合適的天線。當更換新天線或電路板後，可藉由調整匹配網路中的集總元件值維持其效能。為了證實其可行性，我們將切換式匹配網路與數位電視接收IC整合於USB尺寸的接收機上，並以射頻與系統測試驗證接收效能。
本論文第二部分提出一款單饋入雙分支之雙頻CCE天線，可涵蓋LTE全頻帶，包含690 ~ 960 MHz及1710 ~2690 MHz。該天線設計特色是其高低頻段可分開調整，並利用三維耦合結構縮小系統接地板上的淨空區大小，且能夠在不同尺寸的行動設備上使用，該天線與另一IFA形式的LTE全頻帶天線共同建置一個可支援MIMO的雙天線系統。由於行動裝置內天線擺放相當緊湊，具較高的耦合量，我們用接地面上的電流分布分析，在雙天線系統下選擇一合適的擺放位置，以減少天線間的耦合。實驗結果顯示此雙天線系統具有良好的輻射效率與天線分集，適用於LTE的MIMO系統。

An operation band reconfigurable antenna scheme is proposed for handheld devices to cover extensive digital TV broadcasting bands, which include both VHF and UHF bands. A matching network bank with RF switches is employed to divide the broad operation band into four narrower sub-bands with improved matching conditions. When a new antenna or a new platform is adopted, lump elements in the matching network bank can be modified to restore desired performances. To demonstrate the feasibility of the proposed reconfigurable antenna scheme, this work is completed with the control firmware implemented on a single-chip digital TV receiver IC. Both RF and system level tests were conducted to validate the enhanced reception performance.
A single feed and dual branch CCE antenna is also proposed in this work. It provides a coverage on 690 to 960 MHz and 1710 to 2690 MHz LTE bands for uses on mobile devices of different sizes. The antenna adopts the capacitive coupling element technique to minimize the antenna footprint and reduce its clearance distance to the ground. Since the platform is rather compact, two antennas of dissimilar configurations are employed to reduce coupling. Its superior diversity performance is validated with measured effective diversity gain, which confirms that the proposed design is suitable for LTE MIMO uses.

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