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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44417
Title: | 頻率可調之微型化開槽天線 Miniaturized Slot Antenna with Frequency Tunability |
Authors: | Chun-Wei Tseng 曾俊維 |
Advisor: | 陳士元 |
Keyword: | 微型化天線,槽孔天線,頻率可調, Miniaturized antennas,slot antennas,reconfigurable antennas, |
Publication Year : | 2009 |
Degree: | 碩士 |
Abstract: | 本論文首先提出一種以電容性負載進行縮小化的槽孔天線。這個方法是利用電容取代傳統的開路或短路的邊界條件,以縮短槽孔天線在相同共振頻率下所需的長度。由於吾人以微帶線偏移饋入槽孔天線,不僅能達到較佳的阻抗匹配,更無需額外的匹配電路。本論文亦提供一增加該微型化槽孔天線頻寬之方法,對於槽孔長度約為1/17真空波長的微型化槽孔天線,可達到3.2%的頻寬,淨空區之長寬分別為1/16真空波長及 1/19真空波長。最後,吾人利用變容二極體取代一般電容,以達到調整微型化槽孔天線之共振頻率之目的。經模擬與實驗證實,該天線共振頻率之可調範圍涵蓋1.18-2.42 GHz之頻寬。 A novel miniaturized slot antenna terminated by a lumped capacitor is presented in this thesis. A lumped capacitor is placed at the truncated open end of a quarter-wavelength slot antenna to lower the resonant frequency; in other words, to reduce the slot length for the same resonance. The proposed slot antenna is offset fed by a microstrip line with an open stub, which is used mainly to tune out the input reactance of the antenna. With the conventional feeding structure, there is no need for any extra matching circuit. In this thesis, design guidelines for bandwidth enhancement of the miniaturized slot antenna are also discussed. A prototype antenna of slot length λ0 /17 etched on a small rectangular metallic area of dimensions λ0 /16 λ0 /19 provides an impedance bandwidth of 3.2%. Lastly, a varactor diode is used instead of the chip capacitor to attain the frequency tenability for the miniaturized slot antenna. The resultant design exhibits a very wide frequency tuning range between 1.18-2.42 GHz. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44417 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-98-1.pdf Restricted Access | 2.79 MB | Adobe PDF |
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