National Changhua University of Education Institutional Repository : Item 987654321/10990
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題名: Design of dual-frequency circularly-polarized slot antennas with switchable frequency
作者: Hsieh, Tsung-Hsun;Row, Jeen-Sheen
貢獻者: 電機工程學系
關鍵詞: Slot antenna;Circular polarization;Reconfigurable antenna;Dual frequency
日期: 2010-09
上傳時間: 2012-06-05T02:01:21Z
出版者: John Wiley and Sons Inc.
摘要: A reconfigurable design for circularly-polarized (CP) slot antennas with dual-frequency operation is presented in this article. The
proposed antenna structure is composed of an annular-ring slot, fed by an L-shaped strip, and four parasitic patches, symmetrically placed
along the circumference of the ring slot. The slot antenna operates at a one-wavelength resonant mode, and its resonant frequency has a
noticeable reduction with increasing the dimensions of the parasitic patches. Furthermore, while the resonant frequency is decreased, both
good CP radiation and impedance matching can be simultaneously obtained as long as the open-stub length of the L-shaped strip is
properly selected. For the proposed antenna, the effects of various parasitic-patch dimensions on resonant frequency are investigated, and
the obtained results indicate that the resonant frequency ranges between 1050 and 1665 MHz as the length of the parasitic patches is changed.
Therefore, a CP antenna with the capability of switching between two operating frequencies can be realized by employing diodes toreconfigure the length of the parasitic patches. A prototype designed for the dual-frequency operation (L1/L2) of the Global Positioning System is implemented. Details of the antenna designs and experimental results are presented and discussed
關聯: Microwave and Optical Technology Letters, 52(9): 2023-2029
顯示於類別:[電機工程學系] 期刊論文

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