Beam Control Free 28GHz 5G Relay Transceiver and 24GHz Wireless Power Receiver Using On-Chip Butler Matrix

This paper presents a wirelessly-powered relay transceiver for expanding millimeter-wave 5G coverage. By incorporating an on-chip butler matrix, the beam control free 5G relay transceiver is realized. Beamforming can be performed at several beam angles even without an external power source. The prototype of the proposed relay transceiver consists of array antennas on PCB and on-chip butler matrix and rectifiers fabricated in a Si CMOS 65nm process. The proposed relay transceiver achieves in the -45° to 45° beam directions. wireless power transmission (WPT) generates 0.12 mW with 0dBm input power at 24GHz while achieving RF-DC conversion efficiency of 12.2%. The 28GHz communication performance in both RX and TX modes is measured with a 100MHz bandwidth 64QAM.