淡江大學機構典藏:Item 987654321/114794
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    題名: 平面式及單層極化可切換天線
    其他題名: Planar and single-layer polarization switchable antenna
    作者: 蘇千芳;Su, Chien-Fang
    貢獻者: 淡江大學電機工程學系碩士班
    李慶烈;Li, Ching-Lieh
    關鍵詞: 極化掃描;單層;可調式天線;Polarization;Single-Layer;Reconfigurable Antenna
    日期: 2017
    上傳時間: 2018-08-03 15:04:16 (UTC+8)
    摘要: 近年來極化可調式天線受到相當大的關注，因為它能利用於許多應用上，像是極化掃描、頻率可重複使用以及感測系統。
    本文提出了一個新穎的平面式及單層極化可切換天線，所提出的天線設計極化可切換至垂直極化或水平極化。
    本論文所提出的天線可以印刷於印刷電路板上並且利用CPW到ACPS結構來饋送天線，此天線利用偏壓電路來控制二極體做線性極化切換並透過ACPS耦合到CPW來產生CPW的奇模態，而CPW的奇偶模態對提出的天線能分別產生垂直極化或水平極化。
    利用所提出的天線與文獻中的可切換槽孔天線相比較會發現我們所提出的天線具有相對小型的尺寸，並且具有天線結構與天線性能不會隨著接地平面的尺寸改變而改變的優點。此外可以容易調整兩個正交極化的諧振頻率。這個設計可以實現於電路板的邊緣，使其更適合用於實際應用。


    這在我們所提出的天線的垂直極化與水平極化的中心頻率皆為2.4 GHz,另外垂直極化與水平極化的-10 dB反射系數頻寬皆達到4.56 %以上，此外還測量了天線參數，例如:反射系數、天線兩個輸入端的隔離度、天線的增益及輻射場型圖，並利用實測來驗證所提出的設計。
    Polarization reconfigurable antennas have received considerable interest since they are useful for many applications such as polarization diversity, frequency reuse, and sensor systems. In this paper, a novel polarization switchable semi-loop antenna is presented. Polarization of the proposed antenna design can be switched to vertical polarization or horizontal polarization.
    The proposed antenna can be printed on a printed circuit board and utilized a CPW fed to ACPS structure to feed our antenna. This antenna design has a bias circuit to control two PIN diodes. When diode 1 is in the ON state and diode 2 is in the OFF state it is used to produce even mode of the CPW, and another one is when diode 1 is in the OFF state and diode 2 is in the ON state, which is coupled to CPW using ACPS, produces odd mode of the CPW. By exciting even mode or odd mode of the CPW, the proposed antenna can generate vertical polarization or horizontal polarization, respectively.
    Compared to the polarization switchable slot antennas found in the literature, the proposed design has a relatively compact size and has the advantages that the antenna mechanism and antenna performance will not be changed as the size of the ground plane changed. Also, resonant frequencies of the two orthogonal polarization can be easily adjusted. This design can be realized at the edge of the circuit board, making it more suitable for practical applications.
    The center frequency of the vertical polarization and horizontal polarization are both 2.4 GHz and the −10 dB reflection coefficient bandwidth of the vertical polarization and horizontal polarization both are over than 4.56 %, respectively. Antenna parameters such as reflection coefficient, isolation between two input ports, antenna gain, and radiation patterns are also measured to validate the proposed design.
    顯示於類別:[電機工程學系暨研究所] 學位論文

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