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This paper presents the design and simulation of a broadband 3×4 Butler matrix for the IEEE 802.11 b/g/n and ISM bands. The aim of this study is to develop an antenna array feeding networks for Multiple-Input Multiple-Output (MIMO) applications, based on an asymmetric Butler matrix. The asymmetric structure allows to create a further beam on the array's normal axis, in addition to the same beams which...
The design and simulation of a wideband four-port steerable beamforming networks using a 4×4 Butler matrix for the 2.4 GHz applications is presented. The aim of this work is to develop an antenna array feeding network based on Butler matrix with a large bandwidth in order to cover the IEEE 802.11b/g/n band. In order to achieve wideband features, the matrix uses two-section branch-line couplers and...
A broadband Butler matrix by combining the proposed broadband forward-wave directional coupler and a broadband middle network is proposed. Test samples of both the proposed coupler and Butler matrix are fabricated on Ro4003 and the sizes are 0.4 and 1.02 , respectively. For the Butler matrix, the amplitudes of the output...
A broadband Butler matrix with simple structure is presented, consisting of broad band rectangular patch hybrid couplers and novel broad band phase shifters using lambda/8 open and short stubs. Jumping genes evolutionary algorithm is employed to obtain the optimum design. It is measured to have a wide bandwidth of 35.6% centered at 3.65 GHz.
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