Title page for etd-0618116-171245


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URN etd-0618116-171245
Author Yu-Ching Wu
Author's Email Address No Public.
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Department Electrical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Small-Size IFA Frame Antenna for the LTE Metal-Casing Smartphone
Date of Defense 2016-07-10
Page Count 58
Keyword
  • Metal frame
  • mobile antennas
  • inverted-F antenna
  • MIMO system
  • small-size antennas
  • LTE antennas
  • Metal casing
  • Abstract Two small-size frame antennas for the LTE metal-casing smartphone are presented. Both antennas are based on the inverted-F antenna (IFA) structure. The first antenna uses a frame section of 53 mm (about 0.16 wavelength at 900 MHz) along the short edge of the metal casing as the IFA’s radiating strip. By adding the matching circuit to the IFA structure, the antenna can provide a dual-wideband LTE operation to cover the low band of 824~960 MHz and high band of 1710~2690 MHz. The second antenna follows the design rule of the first antenna and achieves a simplified structure. A fundamental mode and two higher-order modes of the IFA’s radiating strip can be generated for the second antenna. By adding the wideband matching circuit in the feeding strip of the antenna, additional resonances in the low and middle bands are created to widen the bandwidths thereof. At the same time, a resonant mode in the high band can be generated by a parasitic shorted monopole, which is also formed by a small frame section along the short edge of the metal casing. With three resonant modes generated and a metal clearance of 2 mm only, the antenna can provide a triple-wideband LTE operation to cover the 824~960/1710~2690/3400~3800 MHz bands. Moreover, by selecting different inductances of the inductor at the shorting strip of the IFA, the resonant mode of the antenna’s low band can be shifted, so that the low band of 704~960 MHz can be covered. For the MIMO study, two second antennas are applied for the 2 × 2 MIMO operation. Good envelope correlation coefficients (ECCs) of the two antennas can be obtained, and much higher channel capacities can be achieved.
    Advisory Committee
  • Wei-Yu Li - chair
  • Po-Wei Lin - co-chair
  • Kin-Lu Wong - advisor
  • Files
  • etd-0618116-171245.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-08-08

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