本論文提出了幾款具有商用價值的微型化手機天線，第一款為應用於手機之Wi-Fi/Wi-MAX (2.5~2.7, 3.4~3.7 GHz)的微型晶片天線，本款晶片天線不需要淨空區，可提供給電路有更大的置放空間，且與電路的整合性較高。而第二款為WWAN/WLAN/Wi-MAX之多頻帶單極天線，吾人善用多分支結構以及背板的寄生元件來達到多頻段的操作，可維持良好的輻射效率。第三款是一組由PIFA/IFA/Chip三個元件天線組成的，具有空間分集特性之智慧型手機天線，吾人利用空間分集技術來縮減多路徑效應所造成的衰減，並且找出各天線的最佳化擺設位置。第四款為整合DAB/DTV/WWAN/GPS/Wi-Fi五隻天線於MID行動裝置，吾人透過戶外的實測驗證VHF頻段DAB主動天線的接收效能。
其次，本論文提出二款應用於無線存取基地台的Wi-Fi/Wi-MAX偶極天線，除了能滿足802.11 a/b/g，亦可涵蓋Wi-MAX (2.5~2.7, 3.4~3.7 GHz)通訊頻段，可有較遠的訊號涵蓋範圍以及高傳輸率。
在指向性陣列天線設計方面，本論文提出了二款具有可切換波束方向的陣列天線。第一款為寬頻八木天線系統，由八木天線結合一對四的射頻開關所組成，達到可切換360度方位，以針對不同位置之物品，達到特定方位標籤辨識之應用。第二款為應用於2.4 GHz的波束切換天線，由巴特勒矩陣電路與八木天線組成，八木天線具有高增益且高的前後比特性，不但可避免非傳輸方向的功率損耗且同時抑制其他方向的空間雜訊。主波束可藉由選擇巴特勒矩陣的輸入埠來切換波束方向。
吾人提出一款應用於5.8 GHz頻段的指向性天線，微帶天線寬長比為1:5，可達到高增益特性，吾人在天線上方加上超穎材料的聚焦板可再進一步提升增益，利用此新穎的的設計架構，不僅可免除複雜的饋入網路又能達到與陣列天線相近的效果。
最後為全向性涵蓋陣列天線的設計。本論文提出了二款。第一款為適用於無線區域網路(5.15~5.85 GHz)摺疊串列式偶極陣列天線的設計，吾人利用摺疊式偶極天線全向性的特性，設計出可涵蓋360度的通訊範圍的串列式陣列天線。第二款為應用於UHF頻段電子式波束切換微帶陣列天線設計，由16隻微帶天線組成，藉由選取適當的天線元件，可達到水平面上360度的涵蓋。

This thesis proposed several types of miniaturized mobile phone antenna designs for commercial uses. The first design is a miniatured Wi-Fi/Wi-MAX (2.5~2.7, 3.4~3.7 GHz) chip antenna for mobile phone applications. This antenna does not require any empty space, which yields more space for system circuits. The second design is a WWAN/WLAN/Wi-MAX multi-band monopole antenna. We use multiple branches and parasitic element on the bottom layer to achieve multi-band operation and provide good radiation efficiency. The third antenna is a PIFA/IFA/Chip antenna arrangement with multi-band and spatial diversity features for smart phone applications. We use the spatial diversity technique to reduce multi-path fading and find the optimal displacement position for each antenna. In fourth research project, we integrate five antennas of DAB/DTV/WWAN/GPS/Wi-Fi applications into a mobile internet device. Among the five antennas, one is an active DAB antenna with improved reception capability.
We also proposed two types of Wi-Fi/Wi-MAX dipole antennas for wireless access point applications. They not only satisfy WLAN 802.11 a/b/g band requirements, but also cover the communication bands of Wi-MAX (2.5~2.7, 3.4~3.7 GHz).
For directive array antenna research, We proposed two types of beam switching array antenna. The first is a broadband yagi antenna system which combines a 1-to-4 RF switch to switch the beam toward four different directions on the azimuth plane. The second beam switching design composes a Butler Matrix and yagi antennas. A yagi antenna provides high gain and high front to back ratio. Through measurements, we verified that this combination can generate four directive switchable beams near the broadside direction.
By applying the metamaterial, we developed a directive antenna at 5.8 GHz band. The patch antenna has a large L/W ratio of 5:1 and has a focusing substrate made of metamaterial placed on top of patch. The antenna gain can therefore enhanced further. This novel configuration, eliminate the need of a complicated feeding network required by phase array antennas.
We also developed two array antennas of omni-directional coverage. The first is serially-connected folded dipole array antenna for Hyper LAN (5.15~5.85 GHz). The second antenna is an electronical beam switching array antenna in the UHF band. The antenna consists of 16 patch elements. It can achieve full azimuth coverage by selecting proper element antenna combinations.

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