本論文主要是在於探討平面式超寬頻(Ultra-Wide Band, UWB)天線的設計以及嵌入式開迴路殘枝(proposed embedded open-circuited stub)的應用。首先，利用共平面波導(Coplanar Waveguide, CPW)的結構作為此超寬頻天線的饋入匹配電路，再設計出反射損失(S11)在UWB頻段(3.1GHz~10.6GHz)皆小於-10dB的超寬頻天線，並成功地實際製作於FR4 的微波基板上。將模擬值與量測值加以比較，發現其有良好的一致性。
研究內容主要針對具有帶拒特性之超寬頻天線為目的，進行分析與討論。目前會有干擾問題的頻帶為5.2GHz及5.8GHz兩個頻帶。為了解決上述頻帶的問題，我們提出一種方式來解決。一種是在天線平面上置入嵌入式開迴路殘枝，皆可阻隔頻帶干擾的問題。帶拒頻天線的頻段是可調整。

In the thesis, the design of Planar Ultra-Wide-Band (UWB, 3.1GHz~10.6GHz) antennas and the application of the proposed embedded open-circuited stub on the isolation frequency enhancement between antennas are discussed. The antennas are first designed using IE3D full-wave electromagnetic simulator, and then fabricated on the FR4 printed-circuit board. Measured return loss, which is better than 10dB from 3.1GHz to 10.6GHz, is in good agreement with simulation.
Designs of ultra-wideband antenna with a band-notched characteristic are present. Therefore, there are the interference issues in the 5.2GHz and 5.8GHz band at present. In order to solve the problem of the notched-frequency band, we propose one ways to overcome. One is by inserting a proposed embedded open-circuited stub on the patch, which is avoid the interference of the notched band. The notch frequency of band-notched UWB antenna is adjustable.

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