為了達到行動裝置輕薄短小的要求及因應多功能手機時代的來臨，本論文研發設計多款具有商用價值之微型化天線，其種類包括：無淨空區2.4GHz晶片天線、FM晶片天線設計與其匹配技巧、以及多頻段手機天線。
由於行動裝置環境日益複雜並且天線可利用面積越來越少，故傳統需要額外淨空區之天線已不利於使用，而一般不需淨空區之PIFA天線所佔面積亦較大。因此，本研究提出一款應用於2.4GHz ISM頻段之無淨空區微型晶片天線，有助於減少天線於行動裝置電路板上使用面積以及對電路板線路設計之影響，並且可具有良好的天線輻射效率。
另外，近來由於行動裝置內建FM頻段系統日益受到重視，所以微型化FM天線設計成為一項相當重要且具有高度挑戰的課題。針對此設計，本論文提出三款FM頻段微型晶片天線及其匹配方式，並加入低雜訊放大器，有助於提升行動裝置內建FM頻段系統之收訊效果及使用方便性。
至於在微型化多頻段手機天線方面，吾人設計出一款適用於GSM, Bluetooth, WiFi, WiMax及UWB等之多頻帶天線。本款天線設計採用多分支單極天線與環型天線組合來達成多頻段之目的，並巧妙地使用short pin來增加天線之共振頻率點與提升整體效能，且天線面積比起IFA, PIFA或其它微帶線型式之天線要小上許多，是一款相當精巧的微型化多頻段手機天線設計，以有效縮小手機電路板面積。

This thesis is to study three miniaturized antenna categories to achieve the various requirements consisted of compact, efficient, low cost and easy fabrication for mobile phone applications. These antenna designs include a miniature planar inverted-F antenna (PIFA), a compact multi-band antenna and three spiral FM antennas with their matching circuits for operating in different specific communication and multimedia bands. Besides, the liquid crystal polymer (LCP) is efficiently applied to manufacture process for both the proposed FM antennas and PIFA so that the antenna components can be easily protected and attached on circuit devices.
Owing to the space limitation of design receiving antenna for mobile phone, the traditional planar antennas required with additional empty space were not suitable to integrate in the circuit devices. Also, the general PIFAs with large antenna fabrication size are undesirable for commercial applications. Thus, a new miniaturized PIFA used in ISM band of 2.4GHz is presented to reduce the antenna occupied space and can be achieved a good radiation performance.
In the other hand, the miniaturization purpose of FM antenna is a very important challenge for antenna engineers since the FM broadcast system has attracted a lot of applications in recent years. In this thesis we investigate three miniature spiral FM antennas with their matching circuits to enhance the antenna radiation performance for utilizing in FM band. Also, a high efficiency low noise amplifier (LNA) can be designed to help proposed FM antennas to improve the receiving signal quality at some specific FM frequencies.
Finally, in order to meet the requirements for both of multimedia and mobile communication, a multi-band antenna is studied for applying with GSM, Bluetooth, WiFi, WiMAX and commercial UWB bands. This compact antenna mainly uses multi-branched monopole antenna and loop antenna to achieve the purpose with multi-band application. Moreover, the antenna resonant frequencies and radiation performance can be increased by using short pin design so that the antenna dimensions can be reduced more flexibly. Therefore, this multi-band antenna size has much smaller than other designs, such as IFAs, PIFAs and other microstrip antennas for mobile phone applications. Furthermore, the proposed antenna can be easily printed with general PCB to reduce the complexity of antenna fabrication.

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