A 25-29 Ghz 64-Element Dual-Polarized/Dual-Beam Small-Cell With 45 Dbm 400 Mhz 5gnr Operation And High Spectral Purity

This paper presents a 25-29 GHz 64-element small-cell (RF to IF) dual-polarized/dual-beam phased-array for 5G communication systems. The small-cell includes dual-polarized antennas, sixteen 2 x 2 beamformers, a dual -channel driver (TX/RX), a dual -channel transceiver, filters, and a local oscillator (LO) on the printed-circuit board. This small-cell provides a measured EIRPPsat of 55 dBm for each polarization with <-40 dBc LO leakage at an IF of > 4 GHz, and 40-140 dBc single-sideband rejection at an IF of 2-8 GHz. The TX output spectrum is measured at an IF of 5 and 6 GHz, and all the spurs are <-55 dB lower than the desired RF signal at 10-dB back-off operation. A complex modulation measurement using OFDM 5GNR 64-QAM 400 MHz waveform (PAPR = 11-12 dB) is performed and a 43-45 dBm EIRP is achieved at 4-5% EVMRMS (-28 to-26 dB) for the small-cell. To our knowledge, this is the first demonstration of a high-performance, low-spur phased-array for 25-29 GHz 5G systems.