Reconfigurable Beamforming Network By Using Passive Phase Shifter

Azahari, Salleh and Abd Shukur, Ja’far and Mohamad Zoinol Abidin, Abd. Aziz and Zulkifli, Shariff (2010) Reconfigurable Beamforming Network By Using Passive Phase Shifter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research presented the design of reconfigurable beamforming using phase shifter at input port which operated at Industrial, Scientific and Medical (ISM) frequency (2.4 GHz). Recently, the growing technology of communication systems is rapidly increasing the use of mobile and computer. This will be increasing the demand of data and capacity system. The smart antenna used to rejecting the interference signal, improve the signal to noise ratio (SNR) and increasing the channel capacity of the system. The beam forming network (BFN) is a network that controls the phases and amplitudes of the excitation current for smart antennas. The switched beam system produces the fixed multiple narrow beams and select from them the suitable beam that gives the strongest signal level. The problem is to ensure the mobile in the dynamic range, the system will shift beam one by one until meet the mobile. In this project, phase shifter used to reconfigurable phase of Beamforming network. Result simulation is obtained by using computer simulation technology (CST) in term of S-parameter in magnitude and phase and phase differences between ports. The 4×4 Butler Matrix, was fabricated on Flame Retardant Board type 4 (FR4 board). The beam position was calculated by using result progressive phase shift. Lastly, the simulation and measurement result was compared. The new beam positions are 1R, 2R, 2L, 1L if compare to conventional beam positions are 2R, 1R, 1L, 2L. As a conclusion, the project successful obtained the new beam position of 4×4 Butler Matrix.

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