因應無線通訊與電磁傳播多樣化的應用需求，本篇論文提出了一款多頻操作的金屬機身筆記型電腦天線與一款應用於電偵系統的超寬頻天線設計。針對應用的金屬特殊環境，調整天線特性，滿足其操作需求。
論文中第一款設計為0.5 ~ 2 GHz之超寬頻天線，可應用於電偵接收系統。單元天線結構包含天線、阻抗匹配轉換器與反射板。天線結構以對數週期型式設計達到超寬頻操作的效果，施作於印刷電路板上，天線輻射場型為天線之法線方向。由於干涉儀式電偵接收機的需求為指向性朝前之輻射場型，故加上錐形反射面來使輻射場型呈現指向性朝上。單元天線總體尺寸為36 cm × 36 cm × 12 cm，3-dB波束寬皆達60度，在各頻率具相當之一致性，而最大增益與效率可達12 dBi與60 %以上，本設計可應用於干涉儀之接收端。
第二款天線設計為應用於窄邊框金屬背蓋之筆記型電腦LTE全頻天線，其架構主要為單極天線，搭配耦合結構與集總元件來進行設計。天線具有可調性，每個結構固定控制特定模態，因此能夠方便地調整設計，以適應環境的改變。天線尺寸為75 × 7 × 2.4 mm^3。本天線的特點為擁有較小的天線高度、可以獨立調整各共振模態，不僅在單純環境下能夠擁有好的表現，放入真實機殼中實測也有一定的效率。天線在單純環境下量測的結果，於LTE/WWAN 頻帶內，反射係數均能達到-6 dB 以下的標準，涵蓋 698-960 MHz 以及1710-2690 MHz 頻帶，天線量測效率在低頻有 30% 以上，高頻也有 50 % 以上的表現。

This thesis presents tow topics pertinent to the development of multi-band and Ultra-Wideband antennas for wireless applications.
The first part is a log-periodic two-arm spiral antenna design for broadband reception uses. It’s intended to be used on detection of radio sources as well as direction finding. The designed antenna operates in the 0.5~2 GHz band. Its structure consists of two spiral arms, an impedance transformer, and a conical reflector. The two arms are placed on the surface of an FR4 dielectric slab and the geometry is of log-periodic spirals. The resulting input impedance of the two-arm spiral is around 120 Ohms. Therefore, a 50-to-120 Ohm transformer is devised. To generate a directive pattern, a reflector is added beneath spiral arms. The total dimensions are 36 cm × 36 cm × 12 cm. Directive patterns are observed at all frequencies. The maximum gain is approximately 12 dBi and the total radiation efficiency is around 60%. Above features meet the direction finding need of radio sources in the UHF band.
The second part is an LTE/WWAN antenna design for laptops with narrow bezel and metal enclosure. The antenna is composed of a monopole antenna and a coupling structure. The antenna can be conveniently adjusted to cope with various changes in the antenna platform. The total dimensions are 75 mm × 7 mm × 2.4 mm. The good performances of the proposed antenna are verified in an actual notebook. The antenna’s matching bandwidth complies with the LTE/WWAN needs. Measured radiation efficiency is above 30% in 698-960 MHz and more than 50% in 1710-2690 MHz.

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