Single- and Dual-Polarized 22–46 GHz Multiband Phased Arrays for 5G MIMO

This paper presents wideband single and dual-polarized phased-arrays for multiband 5G systems. The antenna element incorporates a dipole-fed split-ring multimode resonator (SRR), enabling continuous operation in the 22-46 GHz (N257-N261 bands). The antenna is fabricated using a low-cost printed-circuit board, which facilitates interconnection with the TX/RX beamformer. For demonstration, the single-polarized antenna is employed in an 8 × 8 phased array, while the dual-polarized antenna is implemented in a 4 × 2 phased array. Post-calibration measurements show that the single-polarized 8 × 8 phased array exhibits an EIRP of 42-48 dBm and a scanning capability exceeding 55° at 22-46 GHz, which is ideal for customer premises equipment (CPE) application. The dual-polarized phased array achieves a saturated EIRP of 23-32 dBm at 21-44 GHz for each polarization. The high polarization isolation supports 2 × 2 multiple-input multiple-output (MIMO) applications. System level measurements were conducted using 5G-NR and 64 QAM modulation at 400 Mbaud. The dipole-fed SRR antenna offers the broadest operational bandwidth among single and dual-polarized planar phased array designs, making it a strong candidate for multi-standard 5G applications.