4-Stage Switched Beam Phased Array Antenna Using Butler Matrix

Analysis and design of switched beam phased array antenna at millimeter wave frequency is described in this work. To achieve proposed phased array antenna first we have designed an inset feed patch antenna at 35GHz. A passive beam switching network, Butler Matrix, is modelled at 35 GHz where output of the designed beamforming network is fed to linear 1X4 antenna array to scan at angles 15°, -15°, 45°, -45°. The proposed structure is modelled and simulated in HFSS 3D EM simulator.