本論文分別針對數位電視廣播接收裝置以及行動通訊小型基地台之波束可重置天線系統進行研究，使用電磁全波模擬軟體來進行分析與設計。第一部分為設計一款可應用於印尼數位電視廣播接收之主動式雙頻偶極天線，適當地處理接地面與天線線路，並整合低雜訊放大器於天線印刷電路板上，其中偶極天線利用訊號端與接地端互相耦合激發出寬頻模態於高頻段，並運用摺疊式天線架構激發出低頻模態，達到雙頻帶之要求，且實作驗證此天線之反射係數、輻射場型與效率皆有良好的表現，量測結果與模擬有相當一致的趨勢。第二部分則針對行動通訊小型基地台設計一款應用於LTE Band3與Band7之雙頻雙極化交互偶極天線陣列，並具有傾斜角度可電控調整之指向性波束，利用兩個一對三射頻開關結合三條不同相位延遲路徑，改變單元天線之間饋入相位差，達到波束偏轉的效果，其中採用Arduino單晶片模組提供射頻開關切換所需之電壓訊號，以進行波束切換控制，實測驗證此天線系統於頻帶內皆有良好的匹配以及高指向性輻射場型。

This study uses High-Frequency Structure Simulator (HFSS) to analysis and design.
This thesis contains two parts. First part is to propose an active dipole antenna for digital television broadcast system which operates in Indonesia special band (290-320MHz & 500-650MHz). The antenna design properly arranges the associated ground plane and antenna layout as well as integrates the low noise amplifier into the antenna printed circuit board. Proposed a dipole antenna using the signal and the ground couple with each other to excite a broadband mode in the UHF band, and adding a folded antenna structure to excite the VHF band. With measurements, good performances of reflection coefficient, radiation pattern, and efficiency characteristics are validated. The measurement results agree well with simulation. The second part is to investigate switched-beam antennas for base station (smallcell). A dual-band, dual-polarized cross dipole array operated in LTE Band3 & Band7 is proposed. Moreover, the system has the reconfigurable circuit controlling the beamforming. By using two 1×3 RF switch and three unequal phase delay path changes the phase difference of the fed between the unit antenna. The control of beamforming uses the Arduino UNO board to provide the voltage signal. This antenna system has good matching and high directivity radiation pattern.

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