平面槽孔天線之設計與應用

Designs and Applications of Planar Slot Antennas

黃荃健(Chuan-Chien Huang)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2004年)

摘要

印刷天線具輕、薄、結構簡單及設計容易等優點，為現今無線通訊設備主要使用
之天線基型。本研究針對可應用於 C 波段之 SAR (Synthetic Aperture Radar) 系統或
無線通訊系統之印刷天線加以研究設計，除利用天線設計軟體作模擬與分析來產生最佳
天線結構外，並製作天線成品後進行實驗量測以獲取設計之準確性。在應用於 SAR 系統
天線設計部分，利用槽孔天線在改變其槽孔大小時可增加有效電流路徑長度，達到降低
天線尺寸之特點加以研究，並設計出具雙饋入端與雙極性輻射特性之天線結構。本論文
中，除詳細分析探討輻射主體上之槽孔大小與諧振點及阻抗頻寬之關係外，並將所設計
出來的天線單元，利用饋線連結方式來實現一個 2x2 的陣列天線結構，使其增益大幅提
高。在應用於無線通訊系統天線設計部分，則以共平面波導饋入式平面型天線為雛形加
以研究改良，最後設計出具多頻諧振特性，可應用 GSM900/DCS/PCS/IMT2000 等系統
之多功能天線。本研究中，除探討接地面大小、槽孔大小與饋入線長短對諧振點及阻抗
頻寬的影響外，並與相關文獻所提出之結果作比較與分析，進而提出不同之設計技術。

並列摘要

Printed antenna has many advantages such as light, thin, simple structure and easy
fabrication, so it already becomes the principal prototype of antennas in wireless
communication equipments. The thesis presents the designs of printed antenna which can be
applied in SAR system operated at C-Band of in wireless communications. In addition to
simulate the antenna characteristics by use of the antenna design software for obtaining
optimal antenna structures, the prototype of the proposed antenna has also been fabricated and
tested for achieve agreement with results from simulation. In case of the SAR antenna design,
technology of embedding slots to the patch to obtain longer current path for reducing the
antenna size was applied and studied. Finally, a two-port dual-polarization SAR antenna
element has been approached. In the thesis, besides detailedly discussing the effects between
slot size and both resonance frequencies and impedance bandwidth, an 2 by 2 antenna array
formed by the proposed antenna element has also been constructed to obtain improved high
antenna gain. As to the antenna design for application in wireless communications, the
coplanar waveguide (CPW) feeding planar antenna was selected as a prototype for
investigation. A CPW-fed antenna with multi-bands covering the
GSM900/DCS/PCS/IMT2000 operating bands has finally been achieved. In the thesis, in
addition to discuss the effects between the antenna structure and the radiation performance,
the proposed results have also been compared to those from the literature to show the
importance of the proposed design.

參考文獻

[1] S.A. Long and M.D. Walton, "A dual-frequency stacked circular-disk antenna," IEEE

Trans. Antennas Propagat., vol.27, pp.270-273, 1979.

[2] J.S. Dahele, K.F. Lee, and D.P. Wong, "Dual frequency stacked annular-ring microstrip

antenna," IEEE Trans. Antennas Propagat., vol.35, pp.1281-1285, 1987.

[3] R. Waterhouse, "Small microstrip patch antenna," Electron. Lett., vol.31, pp.604-605,