Design Of A Beamforming Network Using Butler Matrix

Nowadays, communication systems are moving towards higher data rate transmission. MIMO is one of the techniques which is new and widely explore by the researchers. MIMO concept can achieve by implement Beamforming Network into the system. This paper describes the design, simulation and fabrication of a 4 x 4 Butler Matrix for the 2.4 GHz (WLAN). A Butler Matrix is a multiport component which when loaded with radiating elements enables production of a beam of microwave energy in a specified direction in transmission line, dependent upon which input port is activated.The circular and mitered bends was applied in designing the beamforming network based on Butler Matrix technique . . Results from simulation and fabrication is then being compared in term of return loss (Sii), transmission coefficient (Sji), isolation (Sij) and the phase difference{~) between each port (4x4). The measurement patterns result achieved by this project is then compared with the simulation result. The design has been measured by using Advantest R3767 Network Analyzer.