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標題: | 共平面波導饋入多頻帶開槽偶極天線 Multi-band slot dipole antennas fed by coplanar waveguide |
作者: | You-Chieh Chen 陳祐傑 |
指導教授: | 許博文(Powen Hsu) |
關鍵字: | 天線,開槽天線,多頻帶天線,共平面波導, antenna,coplanar waveguide,multi-frequency antenna,slot antenna, |
出版年 : | 2011 |
學位: | 博士 |
摘要: | 本論文提出了多種應用於無線通訊系統之共平面波導饋入雙頻或多頻帶開槽偶極天線。首先,先探討耦合寄生開槽對於共平面波導饋入開槽偶極天線的影響,發現能改良第一高階共振模態之輻射場形,使之與基態之場型一致,所以此天線能夠以相同的場型同時操作於此兩頻帶。第二,本論文提出一可操作於三頻帶之空腔耦合開槽偶極天線。此天線之低頻、中頻帶可藉由調整由空腔伸出之下方以及中間之開槽對所獲得,而高頻帶則是由上方伸出之開槽對以及空腔對之大小所決定。
接著,本論文提出一個小型的三頻帶開槽領結形天線。與其他多頻帶天線不同的是這些天線的尺寸都是由最低頻的操作頻率所決定,而此天線則是由高頻的操作頻率所決定,因此先天上就是一個縮小化的設計。此天線之中頻與低頻操作頻帶可藉由加入兩個不同長度的金屬條於靠近開槽領結的邊緣中獲得,而不需額外增加天線的尺寸。 最後,本論文提出一個共平面波導電容性饋入雙頻帶開槽偶極天線。藉由增加一對開槽段在延伸出去的共平面波導信號線中,第二諧波的共振頻率會隨之降低而不會增加天線的尺寸,而且基態的效能幾乎不受影響。由於使用電容性饋入,相較於其他共平面波導電感性饋入之開槽偶極天線之尺寸,小了將近一半。 Several dual- or multi-band slot dipole antennas fed by CPW for wireless communication systems are proposed in this dissertation. First of all, the effect of parasitic slots on the radiation patterns of the first harmonic mode of a coplanar waveguide-fed slot dipole antenna is presented. By adding four parasitic slots, the radiation patterns of the first harmonic mode of the slot dipole can be modified to be similar to those of its fundamental mode. Therefore, this antenna would operate as a dual-band operator with similar radiation patterns. Secondly, a aperture-coupled slot dipole antenna capable of tri-band operation is proposed. The lower and middle bands can be obtained by varying the lengths of the lower and middle pairs of the protruded slots, respectively, while the upper frequency can be determined by adjusting the lengths of the upper protruded slot pair and the coupling aperture pair. Thirdly, a compact bow-tie slot antenna capable of tri-band operation is proposed. Unlike most of other multi-frequency antennas having their sizes determined by the lower resonant frequency, the size of the proposed antenna is determined by the upper resonant frequency and thus it is compact in nature. The middle and lower operating frequencies are obtained by inserting two metal strip pairs near the ends of the bow-tie slot without increasing the overall antenna area. Finally, a dual-band slot dipole antenna capacitively fed by a CPW is proposed. By adding a pair of slot stubs into the extended CPW signal strip, the resonant frequency of second harmonic mode of the slot dipole can be perturbed and reduced without increasing the antenna area while the performances of the fundamental mode are retained. This antenna is compact when compared with other CPW-fed inductively-fed slot dipole antennas. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30385 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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