Dual-Band Dual Polarization Aperture Shared Antennas for MIMO Sub-6 GHz and mmWave Beamforming

This article proposes a dual-band, dualpolarization antenna system for 5G small cells based on the aperture-shared antennas principle. The system supports MIMO capabilities in the sub-6 GHz band and enables 30degree beamforming in the millimeter-wave band. The lowband antennas are perforated square patches operating at 3.6 GHz, while the high-band antennas consist of three subarrays of four crossed patches designed to operate at 26 GHz. Simulated results demonstrate bandwidths of 154 MHz in the microwave band and 1.73 GHz in the millimeter-wave band, with maximum gains of 6.93 dBi and 9 dBi, respectively. Millimeter-wave beamforming is achieved by activating specific ports.