Abstract
This article presents an eight-element, 28-/39-GHz dual-band, dual-polarized phased array for user equipment, such as computers, cell phones, or other small base stations. The array is based on a dual-band stacked-patch antenna, which can operate simultaneously at 28 and 39 GHz in both polarizations, meeting the fifth-generation (5G) 2 x 2 polarization multiple-input-multiple-output (MIMO) standard at both frequencies. The array is fabricated on a low-cost printed-circuit board and has a measured effective isotropic radiated power (EIRP) of 27-30 dBm at P1dB with a 3-dB bandwidth of 26.5-29 and 36-40 GHz. The array scans to +/- 40(?) at 28 GHz and +/- 30(?)-40(?) at 39 GHz in the azimuth plane. In simultaneous dual-beam operation at the same band, complex modulation measurement with 64 quadrature amplitude modulation (QAM) 400-Mbaud waveforms shows an error vector magnitude (EVM) of < 5% up to an EIRP of 20 dBm for the V-and H-polarized beams. The array needs to be calibrated at 28-and 39-GHz band separately so is currently incapable of interband carrier aggregation (CA). To the best of authors' knowledge, this is the first demonstration of a 5G frequency range 2 (FR2) dual-band, dual-polarized active phased array.