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This paper summarizes an investigation around millimeter-wave (mmWave)multimode circular antenna array based beamformer capable of specially encodeddata transmission in a wide coverage area. The circular antenna array iscapable of an entire 360 deg. azimuth sector coverage where broadcast, uni-castand multi-cast radio transmissions are possible. Orbital angular momentum (OAM)mode transmission along the elevation axis, i.e., perpendicular to the azimuthplane, can also be achieved. These two types of spatially encoded beamformingmakes coverage in almost an entire hemisphere possible. The circular array isdeveloped using twelve multilayer patch antennas with unique radiationperformance aiding in both azimuth and elevation radiation. The proposed arrayarchitecture and its radiation performance makes it a good candidate forspatially encoded beamforming for mmWave 5G.

Millimeter-wave Multimode Circular Array for Spatially Encoded Beamforming in a Wide Coverage Area