  The transmitted signals in the fifth generation (5G) wireless networks suffer
from significant path loss due to the use of higher frequencies in Sub-6 GHz
and millimeter-wave (mmWave) bands. Inter-user interference in an ultra-dense
network offers additional challenges to provide a high data rate. Therefore, it
is desirable to generate narrow beams to extend the coverage of a 5G network by
increasing antenna gain and improve its capacity by reducing the inter-user
interference. This fact leads us to address the use of large aperture uniform
concentric circular antenna (UCCA) arrays for 5G beamforming in massive
multiple-input-multiple-output (MIMO) technology. Our analysis demonstrates
that a UCCA with a larger antenna element spacing is capable of generating a
significantly narrower beam with a moderate side-lobe level than a rectangular
planar antenna (RPA) array while operating with the same number of antenna
elements. This capability of the UCCA is analyzed to discover the performance
gain of a 5G network.
