Design of a broadband switched-beam antenna array with reduced mutual coupling effects for wireless communication

  • Authors:

  • Yu-Ti Kuo;Jwo-Shiun Sun;Chih-Kai Hu;Yi-Chieh Lee

  • Affiliations:

  • National Taipei University of Technology, Taipei City, Taiwan;National Taipei University of Technology, Taipei City, Taiwan;National Taipei University of Technology, Taipei City, Taiwan;National Taipei University of Technology, Taipei City, Taiwan

  • Venue:
  • ARP '07 The Fourth IASTED International Conference on Antennas, Radar and Wave Propagation
  • Year:
  • 2007

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Abstract

A broadband four-port switched-beam antenna with reduced mutual coupling effects is designed and implemented. The proposed switched-beam antenna system including a broadband Butler matrix as a feeding structure and four bowtie-shaped microstrip antennas as driver elements provide good radiation patterns only using four radiating elements. To reduce the side-lobe level of antenna array, metallic strips between radiating elements can be considered. Four bowtie-shaped with reflected-ground plane antennas in conjunction with the broadband four-port Butler matrix are applied to create radiation pattern in different directions and to obtain a front-to-back ratio for 20dB. From the measured results, the side-lobe level is approximately below -10dB.