Mobile station radio frequency unit for 5G communications at 28GHz

This paper presents a millimeter wave mobile station radio frequency unit (MS RFU) operating at 28GHz with two receive (Rx) and two transmit (Tx) chains for MIMO or diversity where each chain utilizes beam steering to enhance signal to noise ratio (SNR). Each phased array employs 4 substrate integrated waveguide (SIW) antenna elements incorporated within the main printed circuit board (PCB). The RFU supports up to 800MHz signal BW and 64QAM OFDM signal with −27dB EVM.