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