Title page for etd-0720116-115231


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URN etd-0720116-115231
Author Chia-Heng Tsai
Author's Email Address legend1027@hotmail.com.tw
Statistics This thesis had been viewed 5564 times. Download 214 times.
Department Electrical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Frequency Reconfigurable MIMO Antenna with Wideband Sensing Capability and High Isolation for Cognitive Radio Applications
Date of Defense 2016-07-20
Page Count 77
Keyword
  • monopole antenna
  • frequency reconfigurable antenna
  • Cognitive radio
  • MIMO
  • varactor
  • Abstract In recent years, the development of wireless communication system has grown rapidly, efficient utilization of the available spectrum has become a more important feature for broadband communication system. Therefore, the cognitive radio (CR) concept has been proposed. A CR technology can provide better spectrum utilization by sensing the occupied frequency band and switching to another frequency. With the trend toward higher data rate, MIMO (Multi-Input Multi-Output) technology plays an essential role for the future wireless communication. Thus, the concept of CR system combination with MIMO technology is a potential solution.
      In this thesis, a frequency reconfigurable MIMO antenna with high isolation is proposed for CR applications. This structure is composed of two planar reconfigurable monopole antennas and a wideband sensing antenna on the single substrate. For MIMO antenna system, mutual coupling is a considerable problem. The wideband sensing antenna at the center of the substrate is used to enhance the isolation between two reconfigurable antennas. The dual-element MIMO antenna can cover a wide range frequency band from 2.18~6.19 GHz by tuning varactor diodes. The frequency reconfigurable ratio that can be achieved is 2.85. The wideband sensing antenna is capable of sweeping the frequency band over 2.17~6.15 GHz. The proposed antenna structure can be applied to cognitive radio system applications.
    Advisory Committee
  • Chih-Wen Kuo - chair
  • Cheng-Yu Ho - co-chair
  • Yu-De Lin - co-chair
  • chen-chao Wang - co-chair
  • Hsin-Lung Su - co-chair
  • Ruey-Bing Hwang - co-chair
  • Ken-Huang Lin - advisor
  • Files
  • etd-0720116-115231.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2016-08-20

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