Title page for etd-0508117-105642


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URN etd-0508117-105642
Author Zhi-hua Feng
Author's Email Address kk0617953@gmail.com
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Department Electrical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title MIMO Antennas in the Metal-casing Smartphone for 2 × 2 and 4 × 4 MIMO Operation
Date of Defense 2017-06-03
Page Count 67
Keyword
  • 2 × 2 MIMO system
  • GPS antennas
  • LTE antennas
  • WLAN antennas
  • loop antennas
  • inverted-F antennas
  • smartphone antennas
  • mobile antennas
  • Metal-casing smartphone
  • 4 × 4 MIMO system
  • Abstract MIMO antennas in the metal-casing smartphone for 2 × 2 and 4 × 4 MIMO operation are presented.
    The first design includes four LTE antennas and two WLAN antennas and the second design includes four LTE antennas.
    In the two designs, all antennas are disposed at the two short edges of the smartphone. In the first design, Antennas 1 and 3 can cover LTE 824~960/1710~2690 MHz.
    Antenna 2 can cover LTE 1710~2690 MHz and GPS operation. Antenna 4 can cover LTE 1710~2690 MHz. Antennas 5 and 6 can cover WLAN 2400~2500/5000~6000 MHz.
    However, when Antennas 1 and 2 are excited, a strong coupling between the two antennas occurred in the high band,
    which causes a high envelope correlation coefficient (ECC) thereof. Therefore, in the second design,
    new four LTE antennas (Antennas 1 and 2 at the top short edge and Antennas 3 and 4 at the bottom short edge) are devised to achieve low ECC and good isolation.
    The main feature of the second design is that the radiating metal-frame of Antenna 2 is shorted-circuited to the system ground plane between the two feed ports of Antennas 1 and 2,
    so that the shorted metal-frame can also be used to direct the excited surface currents in the system ground plane.
    In this case, good isolation and low ECC between two LTE MIMO antennas can be obtained.
    In this design, Antennas 1 and 3 can cover LTE 880~960/1710~2690 MHz. Antennas 2 and 4 can cover 1710~2690 MHz.
    The four LTE MIMO antennas can be applied in the 2 × 2 LTE low-band MIMO and 4 × 4 LTE high-band MIMO systems.
    Advisory Committee
  • Yuan-chih Lin - chair
  • Ting-Wei Kang - co-chair
  • Kin-lu wang - advisor
  • Files
  • etd-0508117-105642.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2017-06-13

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