本研究論文主要是針對WLAN(無線區域網路)與WiMAX (全球互通微波存取)之接收天線進行研究與設計，以滿足無線網路系統上之應用。此外，在實際無線網路應用中，寬頻天線設計有較差之選擇性，此寬頻天線將會造成通訊系統的干擾問題，故設計適用於各工作頻帶之三頻天線，將使得通訊品質更好。此天線主要設計是利用FR4印刷電路板上50歐姆微帶線饋入方式做為載板，再利用倒F型式設計2.45/3.5 GHz雙頻帶之天線，最後利用寄生方式設計5.5GHz 頻帶天線，如此的方式可保有較小之天線尺寸，便可設計出附合應用於2.45/3.5/5.5 GHz 無線網路三頻天線。 此縮小化之三頻天線設計，將滿足應用於手持移動式產品上空間上不足之要求，同時滿足單天線多系統應用的方式。 ;The goal of the thesis is to design the antennas for WLAN (Wireless Local Area Network) and WiMAX (Worldwide Interoperability for Microwave Access).Practically the board-band antennas are of poor selectivity .It is easy to be affected by system noises which offer worsen the quality. Therefore, multi-band antenna should be more suitable to multi-band communication systems. In the thesis, the antenna is first designed in two bands, 2.45 and 3.5 GHz, by using planar inverted-F antennas (PIFA). Thus, a tri-band antenna in 2.45, 3.5, and 5.5GHz is design by using a parasitic coupling strip that is made by 50 ohm microstrip line feed-in on FR4 circuit broad. Also, the proposed design is of very compact size, which is desired in many wireless network applications.
