Beamforming networks using cascaded Butler Matrices

• Main Authors: Abdul Rahim, Sharul Kamal, Gardner, Peter
• Format: Book Section
• Language: English
• Published: IEEE 2007
• Subjects: QA75 Electronic computers. Computer science; TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/11641/1/Beamforming%20Networks%20Using%20Cascaded%20Butler%20Matrices_2007.pdf; http://eprints.utm.my/id/eprint/11641/; http://apps.isiknowledge.com/
• Institution: Universiti Teknologi Malaysia

This paper describes a smart antenna system, which employs the advantages of cascaded Butler Matrices in wireless communication system. By using the narrow beams available from the first Butler Matrix, it is possible for a receiver to increase the gain in the desired signal directions and reduce the gain in interference directions. Hence, high-gain narrow beam signals for long-range application are produced. A technique is introduced which uses a second Butler Matrix, acting as a mirror of the first Butler Matrix, reconstructing the antenna patterns of the individual radiating elements. The resulting outputs have broad beam width that can be used for short-range communication. This beamforming network using Butler Matrices provides a method, which could be applicable in wireless communication system applications.