Beamforming Network Design By Using Blass Matrix

Khairul Muid , Khalid (2008) Beamforming Network Design By Using Blass Matrix. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is to design Blass Matrix beam forming network. Blass Matrix is the method where to solve the problem multiple transmission line and the interferences also to increase the capacity channel. 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 transmi ssion quality in wireless systems and limits their performances. 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 beam forming network is used to feed or receive signals while the beamforming network will feed the signal to an array of antennas. The Blass matrix enables the beamforming network to be explained through a matrix expression. The Blass matrix is simple and easy to fabricate. The design components included hybrid coupler and phase shifter. This project used the Microwave Office 2006 to simulate and design the hybrid coupler and Blass Matrix beamforming network. At the end, the design has been fabricated on the FR4 board microstrip. The magnitude of design Blass Matrix for port I noticed that di fferent between each port were more less -3dB. The phase different was more less I oo for each output when referred to the port 1. The size of the layout was 28.59 em in length and 18.66 em in width.

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