本論文分別針對超微型基地台之多波束天線系統以及窄邊框頻率可重置平板電腦天線進行研究。第一部分探討LTE高頻段之多波束天線系統，以滿足室內小型基站之應用，如室內定位、智慧型家庭等。考量整體裝置尺寸以及功能性，本研究設計出一款可切換天線個數之電路，再將此電路搭配交互偶極天線而形成場型可重置天線，並且進行實作驗證。整體天線系統具有指向性、全向性、對向性三種場型，所有場型之整體輻射效果良好。另外，此款電路能搭配不同型式天線，以符合不同應用環境之需求。第二部分則針對LTE與WWAN頻段提出一款窄邊框頻率可重置天線設計，可內建於平板電腦中，其單一天線占用面積為40×5×5 mm3，而整體結構為立體型式。此款天線可涵蓋LTE與WWAN七個頻帶，其中低頻模態是由寄生元件搭配二極體切換方式以涵蓋較低頻段，而高頻頻段則由蜿蜒微帶線搭配摺疊貼片以及寄生元件所產生的模態結合而成，並且實測驗證此天線於LTE與WWAN七個頻帶內皆有良好的匹配以及輻射效能。

This thesis contains two parts. First part is to investigate switched-beam antennas for the indoor base station(femtocell). By using those antennas, various functions in femtocell applications can be achieved, for instance, smart home control and indoor position tracking. Considering the overall size and functionality, a design of the reconfigurable circuit controlling four antennas to turn on or off is proposed. The antenna system consists of the circuits and cross-dipoles. This system has three kinds of patterns, including directional, omni-directional and bi-directional. Antenna radiation efficiency is above 50% in those cases. The second part is to design LTE and WWAN frequency reconfigurable narrow frame antenna for a tablet. The size of the antenna is 40 x 5 x 5 mm3. By employing a parasitic element extended from the ground plane and a tunable pin diode, an operation band can be achieved in the lower band. The higher band is excited from meander lines and parasitic elements. With measurements, good matching and radiation performance characteristics are validated in seven-band WWAN and LTE.

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