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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69494


    Title: 共平面波導饋入槽孔偶極天線之寬頻與多頻應用;CPW-fed slot dipole antennas for broadband and multiband applications
    Authors: 劉得維;Liu,Te-wei
    Contributors: 電機工程學系
    Keywords: 槽孔偶極天線;多頻帶天線;寬頻天線;共平面波導;slot dipole antenna;multiband antenna;broadband antenna;coplanar waveguide
    Date: 2016-01-25
    Issue Date: 2016-03-17 20:46:50 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本篇論文介紹兩支共平面波導饋入槽孔偶極天線分別對於寬頻與多頻的應用。首先第一支天線為共平面波導饋入之電感式耦合的槽孔偶極天線,在論文中有對於寬頻天線一連串的設計步驟作說明,天線結構是在矩形槽孔末端分別連接上五對細長形的槽孔,每一個共振頻率分別由各別的共振路徑所控制。天線產生的五個模態分別涵蓋DCS (1.71 GHz to 1.88 GHz),PCS (1.85 GHz to 1.99 GHz),WCDMA (1.92 GHz to 2.17 GHz),WLAN (2.4 GHz to 2.5 GHz) 和LTE2500 (2.5 GHz to 2.69 GHz)。實作出來的天線10-dB 比例頻寬達到80%。這支天線的輻射場型在x-z平面和y-z平面的水平(ϕ)極化趨向於全向性,而在垂直(θ)極化則是呈現一個8字形。
    第二支天線為共平面波導饋入之電容式耦合的多頻槽孔偶極天線,天線中心頻率分別設計在2.49 GHz,3.57 GHz和5.25 GHz其中10-dB 比例頻寬分別為12.9%,2.52% 和5.33%。在電路中央的矩形槽孔末端分別連接多對細長形槽孔實現多頻響應,此類設計有很高的設計自由度。三個頻帶分別可應用於WLAN2400 (2.4 GHz to 2.5 GHz),WiMAX (3.4 GHz to 3.69 GHz)和WLAN5200 (5.15 GHz to 5.35 GHz)。天線的場型在H-plane接近一個全向性的形狀。
    ;This thesis introduces CPW-fed slot dipole antennas for broadband and multiband applications. In the second section, we introduce an inductively-coupled CPW-fed slot dipole antenna. This thesis presents a series of broadband uniplanar antenna design. The design shows five pairs of protruded slot line in conjunction with the ends of rectangular aperture pairs. Each operation band is controlled by a respective resonating path resulting in a high design freedom. The antenna produces five modes to cover DCS (1.71 GHz to 1.88 GHz), PCS (1.85 GHz to 1.99 GHz), WCDMA (1.92 GHz to 2.17 GHz), WLAN (2.4 GHz to 2.5 GHz) and LTE2500 (2.5 GHz to 2.69 GHz). The fabricated antenna with 10-dB fractional bandwidth is up to 80%. The proposed antenna achieves a near omnidirectional radiation while horizontal (ϕ) polarization and bidirectional radiation while vertical (θ) polarization in the x-z plane and the y-z plane.
    In the third section, we introduce a capacitively-coupled CPW-fed slot dipole antenna. The proposed antenna presents 12.9%, 2.52% and 5.33% of greater than 10-dB return loss (RL) at center frequency of 2.49 GHz, 3.57 GHz and 5.25 GHz, respectively. By adding the multiple protruded slots, one can achieve multiband resulting in a high design freedom. The three operation frequencies applied in WLAN2400 (2.4 GHz to 2.5 GHz), WiMAX (3.4 GHz to 3.69 GHz) and WLAN5200 (5.15 GHz to 5.35 GHz). The proposed antenna achieves a near omnidirectional radiation H-plane patterns.
    Appears in Collections:[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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