Title page for etd-0615115-102845


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URN etd-0615115-102845
Author Zih-Guang Liao
Author's Email Address No Public.
Statistics This thesis had been viewed 5350 times. Download 0 times.
Department Electrical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Low-Profile Open-Slot Antenna
for the LTE Metal-Framed Tablet Computer
Date of Defense 2015-07-11
Page Count 52
Keyword
  • Metal Frame
  • LTE antennas
  • low-profile antennas
  • tablet computer antennas
  • open-slot antennas
  • Abstract In this thesis, low-profile open-slot antennas applied to cover the LTE operation in the metal-framed tablet device are presented. The first antenna design is a low-profile (5 mm) LTE dual-feed open-slot antenna with active switches. In this design, the active switches are simplified as a conducting strip for the ON-state and an open circuit for the OFF-state. In the lower band, the inverted-L open slot is excited to generate the fundamental resonant mode by the first feed. In the higher band, the antenna is  excited by the second feed to generate the 0.25-wavelength slot resonant mode created by the open-slot radiator formed between the slot opening and the microstrip feedline as a virtual shorting and the 0.5-wavelength slot resonant mode by the closed-slot radiator formed between the slot end and the microstrip feedline as a virtual shorting. By further adding wideband matching circuits in the first and second feeds, the antenna can achieve two wideband operations to cover the LTE bands. The second design is a U-shape open-slot (U-slot) antenna with a low profile of 6 mm for the LTE operation. The antenna can generate 0.5-wavelength and 1.0-wavelength slot resonant modes to cover the desired higher band. By using an inverted-U strip connecting across the U-slot, the antenna can create an additional open-slot radiator to generate a 0.25-wavelength slot resonant mode at lower frequencies. The desired lower wideband is then achieved by the antenna using a high-pass matching circuit.
    Advisory Committee
  • Saou-Wen Su - chair
  • Chih-Hua Chang - co-chair
  • Po-Wei Lin - co-chair
  • Hong-Twu Chen - co-chair
  • Kin-Lu Wong - advisor
  • Files
  • etd-0615115-102845.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-07-15

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