雙頻帶孔隙天線與孔隙天線陣列之應用研究

Abstract

本論文將提出兩種有關孔隙天線的應用，內容包括：雙頻孔隙微帶天線（2.45 GHz與5.78 GHz），2.45 GHz的孔隙微帶天線陣列。 第一部份，我們設計可用於通訊系統的雙頻微帶孔隙天線。利用孔隙微帶天線的第一高階模態去得到雙頻的特性。最初設計在2.45 GHz，再加上一個貼片於接地面便可激發出5.78 GHz。在搭配頻帶分隔器，將這兩個電路連結量測信號收發的特性。量測結果證明了我們的雙頻天線可以用於收發器上。 第二部份為2.45 GHz 的並聯式輸入孔隙天線陣列。針對串聯輸入與並聯輸入孔隙微帶天線之的頻寬與功率合成的觀點上做比較，可以得到並聯輸入的孔隙天線有寬的頻寬與大的功率合成。在陣列天線的設計包含了2組、4組陣列天線的研究。而理論及量測的結果彼此亦相當吻合。

In this report, we present the study of a dual-band (2.45GHz and 5.78GHz) slot antenna. And also development of a design 2.45GHz slot antenna arrays. In the first part, we present a novel dual-band microstrip-fed slot antenna for wireless communication systems at 2.45GHz and 5.78GHz. The first higher order modes of a slot antenna is utilized to create the dual-band antenna characteristic. The slot antenna is originally designed to radiation at 2.45GHz. By adding a stub at the ground plane, we can create another resonant frequency at 5.78GHz. We also integrate it with a band separator, so we can precisely measure the transmitting and receiving signals. We can conclude the dual-band microstrip-fed slot antenna is suitable for transceiver system by measured results. In the second part, 2.45GHz parallel feeding slot antenna array is investigated. Compare the bandwidth and power combining ability of series feeding slot microstrip-fed slot antenna, the parallel feeding microstrip-fed slot antenna, the later has wider bandwidth and larger power combining ability. Therefore, a set of 2 -element slot antenna array and set of 4-element slot antenna array are studied in this design. Good agreement has achieved between the theoretical and measured results.