本論文是以應用於2.4 GHz頻段，無線區域網路的行動裝置天線為研究標的，為了使天線的體積能趨於輕薄短小的需求，故使用了多種天線微型化的技巧，提出三種特性不同的天線設計。其一為側邊饋入的開槽式天線設計，其二為高增益的倒F型晶片天線，其三為將ISM頻段天線和FM頻段天線整合在同一空間的微型化天線設計。
由於行動裝置的使用空間越來越小，所以一款可以容易置入於行動裝置的天線就有其優勢。本論文所提出的側邊饋入式開槽式天線，具有平面化的結構與高增益的場型，可方便運用於手持式的行動裝置。
在業界，如何可以將天線容易地搭配商品大量生產是個重要的議題。晶片天線由於可使用表面黏著技術，方便地組裝於無線行動裝置上，因此本論文提出一款倒F型晶片天線。此設計不但符合天線體積輕薄短小的目標，其天線輻射效率和場型都有不錯的表現，是一款具有商業運用價值的天線。
最後，我們提出一款將無線區域網路頻段的天線和FM頻段的天線整合於一個晶片型式的天線結構設計。雖然兩支天線工作於不同的頻段，但由於其擺放的位置相當接近，如何避免天線間的互相干擾便顯得很重要，本設計利用兩天線間的耦合效應，以FM天線的高階模態延展無線區域網路天線的頻寬，並避免對天線間隔離度的破壞，使兩天線都能在各自頻帶中正常操作。

This thesis focuses on antenna designs applicable to the 2.4 GHz wireless area network band. Because the space in the mobile device is limited, it is critical to design a miniaturized antenna. In this thesis, several antenna miniaturization techniques are employed to design three types of WLAN antennas of different features.
First is a side-fed slot antenna design, which uses a parasitic element to reduce the resonant frequency without changing the antenna size. It’s planar configuration and high gain feature is favorable for handheld devices.
Second is a chip antenna applicable to surface mount technology. It is designed based on the inverted-F configuration. The overall antenna size is reduced by cutting thin slits on the radiator. The radiation efficiency and gain performance meet the requirements for commercial uses.
Third is an integrated design comprising a Wi-Fi antenna and an FM antenna. Although the two operation bands are distinctive, the two antenna structures are packed in the same space and the isolation issue is of concern. By adjusting the coupling between the two antennas, proper operations are achieved in both bands.

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