本論文首先針對車用數位音訊廣播( Digital Audio Broadcasting, DAB )接收天線進行研發設計，提出一款可涵蓋世界各國使用之DAB band III (170-240ＭHz) 倒F天線，其工作原理為在四分之一波長共振的路徑中加入匹配短截線，並調整阻抗的匹配，來達到寬頻的效果，以符合DAB全頻段之操作需求。此款天線乃印刷成薄膜天線的型式，以安裝在汽車擋風玻璃上，不僅在DAB頻段能有好的共振特性，並且尺寸合宜，線路簡單，較不會造成駕駛的視覺負擔。在與產學合作公司攜手導入量產的研發過程中，為了符合實際安裝要求，在饋入線段進行適當的修改設計，並且運用合作公司商標作為天線輻射導體的一部分，不僅有防偽的功能，亦可美化天線，使商品更具特色。本研究使用電磁模擬軟體進行天線分析與設計，所研發薄膜天線在反射損失、增益及效率的模擬上皆有良好的表現，並已進行試量產。我們在本校無反射實驗室實測驗證此車用薄膜天線之反射損失及水平面輻射場型，所得量測特性與模擬結果之變化趨勢相當一致，具有高度的商業應用價值。此外，在DTV的應用上，本論文以同樣的天線設計概念，提出一款操作在台灣數位電視應用頻段 (500-650 MHz) 之薄膜倒F天線，於反射損失、增益及效率的模擬上皆有良好的表現，可以應用在實際量產上。

This thesis proposes first the design of the inverted-F antenna (IFA) which can operate in digital audio broadcasting (DAB) band III (170-240 MHz) for digital broadcasting services and in-car entertainment applications. In this design, a matching stub has been added to a pair of strips resonating at λ/4 lengths for tuning the input impedance to the DAB band. The return loss of the antenna is larger than 6dB in the whole DAB band. The proposed antenna has a simple structure and proper size, which can reduce blockages to driver’s visions. This antenna is fairly appropriate to be implemented into a thin-film type and attached on the windshield of the car. The antenna design is to reduce manufacture cost and allow convenient installations. Moreover, the logo of the collaborating company is used as part of the antenna, which can provide anti-counterfeit, have a better antenna identification and even perform better. Good agreements between simulations and measurements are obtained. Furthermore, for DTV applications, an inverted-F film antenna with the similar structure as the DAB antenna is designed for operating in the DTV band of Taiwan (500-650 MHz). Based on simulations, good performances in return loss, gain, and efficiency are obtained, which may be employed for practical applications.

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