Wide-Angle End-Fire Multibeam Metantenna Employing Dual-Layer SIW 9×9 Butler Matrix for 5G Millimeter-Wave Applications

A wide-angle end-fire metantenna fed by a novel dual-layer substrate-integrated waveguide (SIW) 9×9 Butler Matrix (BM) suitable for millimeter-wave applications is proposed in this paper. By introducing a newly-designed dual-layer SIW 9×9 BM and a wide-beamwidth end-fire metantenna, the half-power angular coverage of the proposed multibeam metantenna is up to ±100°. Compared with other similar works, the proposed multibeam metantenna exhibits wide-angle coverage, making it an attractive candidate for 5G millimeter-wave systems.