The mitered and circular bend method of Butler Matrix design for WLAN application

Abstract

A beamforming network using Butler Matrix technique at WLAN application is presented. This paper describes the design, simulation and fabrication of a 4 times 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 (beta) between each port (4times4). 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.