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A flat and low profile, wideband and high gain Substrate Integrated Waveguide (SIW) Transmission Line (TL) Butler Matrix (BM) beamforming network (BFN) for beamforming and beam-steering applications at 28 GHz (5G) is presented in this paper. Four distinct beams steering between −35° to 35° with sidelobe and return-loss level below −10 dB are generated by connecting the proposed BFN to microstrip antennas...
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