本論文針對操作於ISM頻段的無線通訊裝置進行天線設計，共分為三個部分。第一部分針對應用於室內環境之無線攝影機進行內藏式天線設計。裝置操作頻段為902-928 MHz。為了達到天線與內部電路板整合的內藏式設計需求，天線採用螺旋晶片天線的型式來縮小體積，讓內部電路板有更多的佈局空間。再加入集總元件讓天線有較佳的阻抗匹配與操作頻寬。實測結果顯示可提供良好的影像傳輸效果。

第二部份針對使用金屬材料機殼的無線通訊裝置進行內藏式天線設計，天線操作於902-928 MHz頻段。天線採用槽孔天線形式，其輻射特性不會因為周遭有金屬而失效。吾人將天線與金屬機殼結合在一起，讓機殼成為輻射體的一部份。天線基板材料為軟性電路板，讓天線可應用於曲面的結構上。

第三部分提出了一款應用於無線區域網路(2.4 GHz/5 GHz)的雙頻天線設計。天線為平面式設計，適合內藏於裝置之中。天線在低頻時由接地面與倒F天線結構形成的槽孔產生共振；在高頻則由倒F天線產生輻射。為了要應用於支援MIMO的WLAN無線基地台上，吾人將四支天線放置於測試版四個角落，以達到空間分集與場型分集的效果。實測結果顯示該四天線系統具有不錯的天線分集效果，可做為無線區域網路基地台使用。

Three topics relevant to antenna design for compact wireless communication device operating in ISM bands are studied. The first part presents an internal antenna for wireless cameras used an in indoor environment. The goal is to develop a circuit-integrated internal antenna and save the layout space. A helical chip antenna configuration is used. Lump elements are also employed to get good impedance matching and to extend the operation bandwidth. According to measurement results, this antenna design can provide good performance for video data transmission.

In the second part, a device-integrated antenna designed for wireless communication devices operating in the 902 to 928 MHz band is presented. The slot antenna is used because its radiation characteristic are not subjected to the presence of the device's metal enclosure. The antenna is printed on a flexible printed circuit board and integrated as a part of the metal case.

In the third part, a dual-band antenna is proposed for the WLAN access point
application. The antenna can be placed within the device due to its planar structure. The resonance in the low band is produced by a slot, which is formed by the ground plane and the high band inverted-F antenna . In order to implement the antenna for MIMO uses, four antennas are placed at corners of the test board to utilize spatial diversity and pattern diversity. Measured results indicate the proposed multiple antenna configuration is applicable to WLAN and has a good antenna diversity performance.

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