本篇論文主要目的為設計內建於筆記型電腦的寬頻無線數位影音地面廣播系統( Digital Video Broadcasting - Terrestrial: DVB-T ) 接收天線。天線饋入方式則採用50 W 電纜饋入的形式，天線中央為開路耦合結構，使天線得以共振出較低頻率。天線末端則加入晶片電阻下地來達到寬頻的阻抗匹配。設計概念採用FR4基板加以實現，並進行驗證。天線設計採用HFSS 電磁模擬軟體將主輻射體、耦合部分先做初步模擬分析，再針對各部位如天線尺寸、頻率與晶片電阻等參數做細部的調整，並對天線特性如反射損失與輻射場型加以分析與討論。論文所提出的小型化寬頻無線數位影音廣播系統接收天線符合國際無線數位電視所規範的頻寬從470 MHz 至 860 MHz。天線頻寬可達58.6%以上 ，尺寸為120 × 11 × 1.2 mm3。 E-plane輻射場型如同傳統單極天線呈8字場型，而H-plane為全方向性。 Abstract The main topic of this thesis is to design an antenna for compact wireless broadband digital video broadcasting system (Digital Video Broadcasting - Terrestrial, DVB-T). The antenna is fed by probe. A coupling structure in the center of the antenna is designed to generate low band and a chip resistor is added at the end of the antenna to increase bandwidth. The proposed antenna was fabricated on and FR4 substrate. The design parameters, such as the dimension of antenna (width and length) and chip resistor, were extensively analyzed by adjusting at different frequency bands (low-band, middle-band and high band). The return loss and radiation pattern were simulated and measured to verify the design concept. The compact wireless broadband digital video broadcasting system mentioned in the thesis conform with international norms of digital television bandwidth of 470 MHz to 860 MHz; the antenna gain can meet the requirement in real applications. The radiation pattern in E-plane exhibits an eight figure just as conventional monopole antenna. The radiation in H-plane shows an omni-directional pattern.
