小型化寬頻帶印刷槽孔天線

Abstract

本論文的內容設計了新型的槽孔天線，針對其特性進行分析及探討。其中依不同的操作方式做了不同的設計。再線性極化方面，首先提出印刷槽孔天線之寬頻帶操作設計，即是在天線饋入線尾端，加入一階梯式補片，利用階梯尺寸的不同，造成寬頻帶操作方式，其操作頻寬可達到17.4%。緊接著研究印刷槽孔天線之雙頻帶操作設計，也就是在微帶線饋入寬矩形槽孔天線上載入一個矩形槽孔造成雙頻的操作特性。此外，在圓極化方面，針對圓形微帶天線的特定圓環型槽孔結構，提出一種不對稱擾動方式之圓極化操作設計。此圓極化的印刷槽孔天線其圓極化頻寬可達到24.8%。

Novel design of printed slot antennas have been investigated in this dissertation. For the linearly polarized designs, the study of single-feed broadband printed slot antennas with patch is presented. As for the broadband printed slot antenna designs, a printed slot antenna with a coplanar-waveguide feed is shown. We use patch with different size to increase bandwidth. The impedance bandwidth obtained reaches about 17.4%. As for the dual-frequency slot antennawith dual-loop with microstrip feed is shown. For the circularly polarized designs, we propose a circularly polarized microstrip antenna with an asymmetry of the antenna structure. By choosing a suitable slot length, CP operation can be obtained. The obtained CP bandwidth of this design is greater than 24.8%.