A 32 element circular-shaped corporate feed antenna array for millimeter-wave femtocells

A millimeter-wave circular antenna array using corporate feed for fifth-generation(5G) femtocell applications were designed and analyzed. The evolution of the proposed antenna is from a single to a thirty-two-element patch antenna. This array antenna indicates low return loss at multiple frequency bands like 20GHz, 25GHz, 30GHz, and 35GHz with reflection coefficient values like -23.35dB, -16.87dB, -16.91dB, and -9.54dB when measured using a vector network analyzer, including almost 93% antenna efficiency and obtained maximum gain values like 6.18dBi, 3.10dBi, 3.94dBi, and 2.95dBi when measured in an anechoic chamber. The 8×4 circular array antenna has achieved better accord between simulated and measured results. The proposed antenna attains good circular polarization with 3dB axial ratio values of 0.344dB at 28.23GHz and 2.49dB at 38.63GHz and follows left-hand circular polarization (LHCP) at all the considered resonating frequencies which can be used for manufacturing of 5G femto-base stations.