Title page for etd-0707103-213454


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URN etd-0707103-213454
Author Wei-Ren Li
Author's Email Address No Public.
Statistics This thesis had been viewed 5350 times. Download 6997 times.
Department Electrical Engineering
Year 2002
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Design and implementation of the four-beam smart antennas based on butler matrix
Date of Defense 2003-06-13
Page Count 51
Keyword
  • Butler Matrix
  • Smart antenna
  • Microstrip Antenna Array
  • Abstract The switched-beam antenna is one type of the smart antennas, which consists of the antenna array and the beamforming network. The four-beam smart antenna generates four beams to cover a 120° area, which can be used to improve the carrier-to-interference ratio and the frequency reuse of a cellular system.
    Due to the attractive features of microstrip antennas such as low profile, easy fabrication, and low cost, we use microstrip antennas as array elements. In this thesis, we propose a novel four-beam beamforming network which consists of a 4×4 Butler Matrix and four 180° power dividers. This network is able to provide low side-lobe level. A modified Butler Matrix not only simplifies the circuit of the 8×8 Butler Matrix, but also meet the requirement of the original Butler Matrix. From the result of measurement, the side-lobe level of each beam of the modified Butler Matrix is less than –10 dB. We also show that this method is applicable to any  Butler matrix. 
    Advisory Committee
  • Chih-Wen Kuo - chair
  • Tzong-Lin Wu - co-chair
  • Keh-Yi Lee - co-chair
  • Ming-Chih Hsieh - co-chair
  • Ken-Huang Lin - advisor
  • Files
  • etd-0707103-213454.pdf
  • indicate access worldwide
    Date of Submission 2003-07-07

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