應用左手傳輸線於串聯式天線陣列之可行性探討;Feasibility Study of Using Left-Handed Transmission Line on Series Antenna Array

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Title:	應用左手傳輸線於串聯式天線陣列之可行性探討;Feasibility Study of Using Left-Handed Transmission Line on Series Antenna Array
Authors:	廖元維;Wei, Liao Yuan
Contributors:	電機工程學系
Keywords:	左手傳輸線;天線陣列
Date:	2017-07-26
Issue Date:	2017-10-27 16:11:43 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文在於串連式天線陣列與左手傳輸線的設計與探討。在天線陣列的部份，我們在各天線單元的饋入點前加上四分之一波長阻抗轉換器，使其S11¬達到單一共振模態。我們也改變饋入線的形狀，使其在各天線單元間有360的相位差。在天線陣列遠場的部份，我們發現這樣的天線陣列會有增益飽和的現象，也發現這樣的天線陣列的主波束還會因頻率的改變而變形。為了解決輻射場型變形的問題，我們利用文獻[9]的原理的相位響應斜率小之特性設計左手傳輸線。本論文是利用Layout的方式來設計左手傳輸線，但是在設計的過程中我們遇到一些問題。這些問題主要有三個：介入損耗過大，左手傳輸線的物理長度不夠與左手傳輸線的電氣長度與天線陣列所要的規格有落差。針對這些問題，我們使用模擬軟體來做分析並探討其實作的可行性。本論文所使用的全波模擬軟體為HFSS，電路模擬軟體為ADS。 ;The design of series antenna array with left-handed transmission line (LH TL) are discussed in the thesis. In the section regarding the antenna array, we add a quarter-wavelength impedance transformer at the feed point of each antenna element to obtain a single resonant mode. We also change the shape of the feed line so that it has a phase difference of 360 between the antenna elements. For the far field of the antenna array, we find that such an antenna array will have a gain saturation phenomenon. Also, the main beam of antenna array will be deformed due to changes in frequency. In order to solve the problem of deformation of radiated field, we use the theory of LH TL to design transmission lines, and some problems in the processing of design are encountered. There are mainly three problems: too much insertion loss, the insufficient physical length of the LH TL, and the unfit electrical length of LH TL for the specifications of series antenna array. To understand these problems, we use simulation software to do the analysis and investigate the feasibility of its implementation. The full-wave simulation software used in the thesis is HFSS, and the circuit simulation software is ADS.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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