Compact Butler Matrix Design

Norjannah , Nordin (2008) Compact Butler Matrix Design. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

 With the growing technology of wireless local area network (WLAN), the demand for wireless communication to increase its capacity increases as well. As the number of users increase, the co-channel interference fading also increases. This reduces the transmission quality in wireless systems and limits their performances. The technology of smart antennas seems to be able to reject interference signals and increase desired signal level, which will enhanced capacity. The beamforming network is a network that controls the phases and amplitudes of the excitation current for smart antennas. A signal processor will control which port of the beamforming network is used to feed or receive signals while the beamforming network will feed the signal to an array of antennas. The purpose of this project is to design a compact 4 x 4 beamforming network based on Butler matrix concept. Two designs for the Butler matrix were developed. The first design is a large layout which is 263.73 cm 2 while for the second design it is more compact where the size was reduces for 53.59 % from the first design. In order to produce the reduction size of the design, the length of transmission line has been optimized and meander line techniques have been used. The Microwave Office 2006 software was used to simulate both designs. Both designs were export to CorelDRAW12 software before printed and then fabricated on the FR4 PCB. End of the project, it is found that Design 2 display better characteristics in both simulation and fabrication compared to Design 1. It also has the added advantage of being compact in size.

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