National Institute of Posts and Telecommunications Rabat

Rabat, Morocco

National Institute of Posts and Telecommunications Rabat

Rabat, Morocco
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Nachouane H.,National Institute of Posts and Telecommunications Rabat | Najid A.,National Institute of Posts and Telecommunications Rabat | Tribak A.,National Institute of Posts and Telecommunications Rabat | Riouch F.,National Institute of Posts and Telecommunications Rabat
International Conference on Next Generation Networks and Services, NGNS | Year: 2014

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 are created by the symmetrical version. The proposed circuit presents a high isolation and wideband features. The circuit can be used for both transmission and reception systems to ensure the Multi-User MIMO (MU-MIMO) service. © 2014 IEEE.


Nachouane H.,National Institute of Posts and Telecommunications Rabat | Najid A.,National Institute of Posts and Telecommunications Rabat | Tribak A.,National Institute of Posts and Telecommunications Rabat | Riouch F.,National Institute of Posts and Telecommunications Rabat
International Conference on Multimedia Computing and Systems -Proceedings | Year: 2014

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 four-section branch-line crossovers instead of the standard ones. The proposed circuit exhibits a high isolation and wideband 4×4 Butler matrix designed and simulated by using a single-layer FR-4 substrate, which covers the frequency band ranging from 2.1 GHz to 2.75 GHz. The return losses and the isolation are better than 28 dB and 30 dB, respectively, with its good performance is more suitable for IEEE 802.11b/g/n and ISM applications. © 2014 IEEE.

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