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Multi-beamwidth antenna beamforming network using Butler matrix

A. M. IBRAHIM1, S. K. A. RAHIM1, A. Y. ABDULRAHMAN1, K. G. TAN2, A. W. REZA3,*

Affiliation

  1. Wireless Communication Centre, Fakulti Kejuruteraan Elektrik, Universiti Teknologi Malaysia, 81310 UTM Skudai, Malaysia
  2. Faculty of Engineering & Technology, Multimedia University, 75450 Melaka, Malaysia
  3. Faculty of Engineering, Department of Electrical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

A reduced size dual beam antenna system is presented in this paper. The design of scaled down antenna system with a dual beam capability is realized by using a single Butler matrix instead of cascaded Butler matrices. The signals from output ports of the Butler matrix act as a beamforming network with narrow beam width for long distance communications (LDC), whereas signals from the output port of each Wilkinson Power Divider have broad beam width, which is suitable for short range communications (SRC). Hence, 50% size reduction in the overall beamforming network structure is achieved while still maintaining the same dual beam capabilities, like cascaded Butler matrices structure. The produced narrow beams have an angular width of approximately 27.3⁰ each, while the broad beams have an angular width of about 97.7⁰ each. The proposed antenna has an enormous potential in point-to-point and point-to-multipoint communications, particularly in intelligent transportation system (ITS) applications..

Keywords

Dual beam antenna, Beamforming network, Butler matrix.

Citation

A. M. IBRAHIM, S. K. A. RAHIM, A. Y. ABDULRAHMAN, K. G. TAN, A. W. REZA, Multi-beamwidth antenna beamforming network using Butler matrix, Optoelectronics and Advanced Materials - Rapid Communications, 7, 3-4, March-April 2013, pp.258-262 (2013).

Submitted at: Aug. 3, 2012

Accepted at: April 11, 2013