English  |  正體中文  |  简体中文  |  Items with full text/Total items : 58017/91564 (63%)
Visitors : 13712589      Online Users : 58
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/52545

    Title: 平面倒L/F天線饋入方式的比較研究
    Other Titles: Investigation of feeding methods for the inverted L/F antennas
    Authors: 陳曦;Chang, Hsi
    Contributors: 淡江大學電機工程學系碩士班
    李慶烈;Li, Ching-lieh
    Keywords: 倒L天線;寄生;偏移饋入;offset-fed;ILA
    Date: 2010
    Issue Date: 2010-09-23 17:54:29 (UTC+8)
    Abstract: 近幾年來,行動通訊網路一直是無線通訊最廣泛的應用,伴隨著網路世界的快速發展,網路已成為應用軟體重要的搭載平台,而由固定寬頻網路發展出無線區域網路,乃是非常重要且關鍵的一步,它能使消費者可連接(access)的網路區域延伸涵蓋任何角落。不需網路線只需透過無線行動裝置即可上網,然而,在這些輕巧的行動裝置中,天線要如何整合至電子產品,則需要設計上的巧思,其中縮小天線的面積尺寸為重要的關鍵技術。
    In recent years, mobile communication network has been the most widely used wireless application, along with the rapid development of the Internet world wide web. Nowadays, network has become an important platform to carry various software application. Furthermore, the development of wireless LAN out of the fixed broadband networks is a very important and critical step, which enables consumers to access network almost from any place. No need for the cable can one access the network via simply the wireless mobile devices. However, with these compact mobile devices the antenna should be
    carefully integrated, which requires design ingenuity. Among which, technologies to reduce the antenna size are important ones .
    In this thesis the characteristics of the basic inverted L antenna are examined first. As a good comparison of the original inverted L antenna, an offset-fed inverted L antenna is proposed to improve the ILA, for which the impedance mismatch problem at the fundamental frequency (1.8GHz) is resolved, but still retain the low profile, small size and other inherent advantages of the ILA antenna. The offset-fed approach is is entirely different from the design concept of the traditional inverted F antenna (IFA).
    Then, associated with the ground surface, the introduction of several coupling strips of different geometrical shape is employed to increase available frequency range for the offset feed antenna. The goal is to achieve the dual-band antenna design. By exploring the characteristics of such antennas, the return loss, the real part of impedance and imaginary impedance of the original antenna were carefully compared, by which the uses of coupled strip are tested with the aim of dual-band design.
    Finally, the paper investigate effect of changing the feeding position of the traditional inverted F antenna. Simulation results show that by simply changing the feeding position the resonant frequency can be substantially moved around, while a very good impedance matching is maintained, which is quite interesting and of practial use.
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Thesis

    Files in This Item:

    File SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback