本論文針對應用於WLAN與WWAN無線通訊裝置，來分別設計出兩款微型天線，其不僅體積小，而且輻射效能佳，可內建在行動裝置中來接收無線訊號，具有相當高之商業價值。第一款天線為操作於WLAN 2.4/5 GHz之微型天線，其利用平面式倒F天線的架構，並配合短路腳和一小部分之淨空區，來達到降低操作頻率以及微型化目標，以符合內建於手機、PDA及無線網卡之設計需求。另外，此天線運用廉價之FR4來當作基材，可有效降低成本和製程複雜度。另一方面，為滿足現行筆記型電腦之無線通訊功能，本論文提出第二款應用於WWAN之倒F天線，其利用簡單的結構來設計出符合GSM 850/900/1800/ 1900/UMTS等五個操作頻段。由於此款天線僅有9mm之設計高度，並且具備了近似全向性場型及好的輻射效能，因此能夠靈活地內建於筆記型電腦中，來接收WWAN無線訊號。

This thesis proposes two miniature antennas for WLAN (Wireless Local Area Network) and WWAN (Wireless Wide Area Network) applications, respectively. Both those antennas are with a compact size and good radiation performance so that they may be built in the portable devices to receive wireless signals for commercial applications.
Firstly, a miniature planar inverted-F antenna for WLAN 2.4/5 GHz operation is presented. Small empty space and thin shorting pin of the proposed antenna are carefully designed to lower operating frequency and miniaturize antenna size in this study. Thus many design requirements in cellular phone, PDA and wireless network card can be easily achieved. Also, an FR4 substrate is used to fabricate antenna to reduce cost and complexity for manufacture products.
Moreover, in order to have more communication functions in radio for current laptop computers, the second inverted-F antenna is thus proposed to meet WWAN applications in this thesis. The antenna under a design limitation of 9mm height uses simply structure to resonate five operating bands of GSM 850/900/1800/ 1900/UMTS. Good radiation performance and near omni-directional pattern are both obtained. Therefore the proposed antenna may be flexibly embedded within the laptop computer to gather wireless signals for WWAN system.

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