Title page for etd-0612112-104507


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URN etd-0612112-104507
Author Ying-chieh Liu
Author's Email Address No Public.
Statistics This thesis had been viewed 5353 times. Download 736 times.
Department Electrical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title LTE/WWAN and LTE MIMO Antennas for Ultrabook Computers
Date of Defense 2012-06-02
Page Count 70
Keyword
  • isolation
  • MIMO (Multiple-input and Multiple-output) antennas
  • parallel resonant circuit
  • slot
  • WWAN (Wireless Wide Area Network) antennas
  • LTE (Long Term Evolution) antennas
  • ultrabook computer antenna
  • Abstract In this thesis, WWAN/LTE and LTE MIMO antennas for ultrabook computers are presented. The MIMO antenna system comprises an eight-band LTE/WWAN antenna and a three-band LTE antenna. The bandwidth of the eight-band LTE/WWAN antenna is enhanced by using an embedded parallel resonant circuit, which can result in dual-resonance excitation of the lowest resonant mode of the antenna. The bandwidth of the antenna‚Äôs lower band can hence cover the LTE700/GSM850/900 operation. A design technique of improving the isolation of the MIMO antenna system is also presented. The isolation enhancement is obtained by embedding a 0.5-wavelength slot in the conductive supporting plate of the upper cover of the ultrabook computer. The embedded slot can attract the excited surface currents in the conductive supporting plate and decrease the coupling between the MIMO antennas through the coupling of the surface currents. The isolation between the MIMO antennas can hence be enhanced. Moreover, this technique will not lead to decreased radiation efficiency and impedance matching of the MIMO antennas, which is attractive for practical applications.
    Advisory Committee
  • Shu-Yi Lin - chair
  • Hong-Twu Chen - co-chair
  • Wen-Shan Chen - co-chair
  • Hua-Ming Chen - co-chair
  • Kin-Lu Wong - advisor
  • Files
  • etd-0612112-104507.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2012-06-12

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