Title page for etd-0611112-191444


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URN etd-0611112-191444
Author Yeh-chun Kao
Author's Email Address No Public.
Statistics This thesis had been viewed 5353 times. Download 125 times.
Department Electrical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Bandwidth Enhancement of the LTE/WWAN Handset Antenna by Improving the Current Distribution in the System Ground Plane
Date of Defense 2012-06-02
Page Count 63
Keyword
  • Distributed parallel resonance (PR) circuit
  • LTE/WWAN antennas
  • Mobile phone antennas
  • Body effects
  • Specific absorption rate
  • Hearing aid compatibility
  • Surface current in the system ground plane
  • Abstract Bandwidth enhancement of the LTE/WWAN handset antenna achieved by improving the excited surface current distribution in the system ground plane is presented. To achieve this goal, the system ground plane is shaped to be of a C-shape in this thesis. In this case, the longitudinal excited surface current in the system ground plane can have a smooth distribution. The proposed antenna is disposed at one edge of the C-shaped system ground plane, and the antenna comprises a driven monopole strip, a shorted monopole strip and a distributed parallel resonance (PR) circuit. By controlling the resonant frequency of the distributed PR circuit, it can result in dual-resonance excitation of the lowest resonant mode contributed by the shorted monopole strip to cover the LTE700/GSM850/900 operation. The antenna also occupies a small volume of 44 × 10 × 5 mm3 (about 2.2 cm3). Good radiation characteristics of the antenna are also obtained. For practical applications, effects of the electrical connection between the system ground plane and the surrounding metal elements such as the battery’s metal casing and the handset metal midplate are studied. The simulated SAR (Specific Absorption Rate) and HAC (Hearing Aid Compatibility) results are also analyzed.
    Advisory Committee
  • Hua-Ming Chen - chair
  • Shun-Yun Lin - co-chair
  • Hong-Twu Chen - co-chair
  • Wen-Shan Chen - co-chair
  • Kin-Lu Wong - advisor
  • Files
  • etd-0611112-191444.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2012-06-11

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