本論文針對車用數位電視系統接收天線與低雜訊放大器進行研發設計，首先提出一款能涵蓋台灣頻帶數位電視廣播之主動式偶極天線，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上。接下來提出另一款可涵蓋泰國頻帶數位電視廣播之主動式偶極天線，此天線是以上述天線為基本架構，再使用耦合式饋入設計之主動式天線，可具有較寬頻之響應。此外，為了避免數位電視頻段受到行動通訊頻段之影響，此主動式天線之低雜訊放大器加入帶拒電路來抑制鄰頻干擾，以確保接收訊號品質。另外，針對印尼特殊應用頻帶提出一款雙頻偶極天線，其中亦使用耦合式饋入而於高頻段產生寬頻模態，並且運用摺疊式天線架構激發出低頻模態來達到雙頻之要求。本研究應用電磁模擬軟體進行主動式天線分析與設計，所獲得天線之S參數、輻射場型與效率皆有良好的表現。實測驗證部分乃使用本校球面近場無反射實驗室與向量網路分析儀，以進行3D輻射場型與S參數的量測，所量測的結果與模擬趨勢相當一致。最後將天線安裝於汽車保險桿上進行路測比較，展現出良好的接收效能而具有高度的商業應用價值。本論文之主動式天線設計已進行量產，並且實際應用於車用數位電視系統中。

This thesis proposes three active dipole antenna designs for in-car digital television systems which operate in digital video broadcasting - terrestrial (DVB-T) Taiwan band (530-602 MHz), digital video broadcasting - second generation terrestrial (DVB-T2) Thailand band (514-722 MHz) and Indonesia special band (290-320 MHz & 500-650 MHz), respectively. The first antenna design for Taiwan band properly arranges the associated ground plane and antenna layout as well as integrates the low noise amplifier into the antenna. Then, for covering the whole UHF band, a coupled fed design based on the previous antenna structure is proposed. Besides, to avoid interferences from adjacent bands, a notch circuit is added in the low noise amplifier. As for the third antenna, both UHF and VHF bands are covered by using also the coupled fed design to produce a broadband mode in the UHF band, and adding a folded antenna structure to excite the VHF band. Measurements are performed by using the spherical near field anechoic chamber and vector network analyzers at Taiwan Tech. Good agreements between the measurements and simulations in S-parameters, radiation patterns, and radiation efficiencies are obtained. Also, road tests by mounting the antennas on the bumpers of the cars are carried out to test reception performance for practical applications. Excellent receiving capabilities are obtained. Thus, those designs are in mass production and applied in vehicle DTV systems now.

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