Title page for etd-0524117-174738


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URN etd-0524117-174738
Author Che-chi Wan
Author's Email Address wancc@ema.ee.nsysu.edu.tw
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Department Electrical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title MIMO Metal-Frame Antennas for the Metal-Casing Smartphone
Date of Defense 2017-06-24
Page Count 52
Keyword
  • Metal-casing smartphone
  • Wideband decoupling
  • Metal-framed smartphone
  • Smartphone antennas
  • LTE antennas
  • MIMO system
  • Abstract LTE MIMO frame antennas for the metal-casing smartphone are presented. The first design includes six antennas (Ant1 to Ant6) and is for the LTE/WLAN MIMO operation. All the antennas are disposed at the short edges of the smartphone. Ant1, Ant2, and Ant5 are disposed at the top edge of the smartphone. Ant1 provides LTE operation in 824~960/1710~2690 MHz. Ant2 covers 1710~2690 MHz for the LTE operation and 1575~1610 MHz for the GPS operation. Ant5 provides WLAN operation. Ant3, Ant4 and Ant6 are disposed at the bottom edge of the smartphone. Ant3, Ant4 and Ant6 follow the design rule of Ant1, Ant2 and Ant5, but Ant4 does not cover the GPS operation band. Ant1 and Ant3 can be applied in 2 × 2 LTE MIMO operation in 824~960 MHz. Ant1, Ant2, Ant3 and Ant4 can be applied in 4 × 4 LTE MIMO operation in 1710~2690 MHz. Ant5 and Ant6 can be applied in 2 × 2 WLAN MIMO operation. However, it is found that the isolation and ECCs of the 4 × 4 LTE MIMO operation in 1710~2690 MHz need to be improved. To solve this coupling issue in the MIMO antennas design, a second design is devised. Two self-decoupled LTE MIMO Antennas are proposed. The first antenna covers 880~960 MHz in the low band and 1710~2690 MHz in the high band. The second antenna covers 1710~2690 MHz in the high band. The second antenna is an inverted-F antenna (IFA) using a frame section along the short edge of the metal casing as the IFA’s radiation strip. The frame section is gap-coupled to a feed network and also short-circuited to the system ground plane at a position between the two antennas. In this case, the excited surface currents on the ground plane will be directed to the frame section of the second antenna, without entering into the feed ports of the antennas. The coupling between two antennas can thereby be greatly decreased and good independent radiation patterns of the two antennas can be obtained. Therefore, isolation and ECCs for the 2 × 2 LTE MIMO operation can be improved. Moreover, two additional antennas of the same can also be disposed at the opposite short edge to achieve a much higher channel capacity for the 4 × 4 LTE MIMO operation.
    Advisory Committee
  • Hong-twu Chen - chair
  • Shun-yun Lin - co-chair
  • Kin-lu Wong - advisor
  • Files
  • etd-0524117-174738.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2017-06-24

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