Research On Q-band 5G Millimeter-wave Transmitter Array

With the rapid development of mobile internet and mobile communication,demand for wireless transmission rate and data traffic of mobile communication increase rapidly.However,the low frequency of radio spectrum becoming increasingly saturated,now days,mobile communication in millimeter wave become the research focus for next generation wireless communication.Q band transmitter array for 5G millimeter wave communication has been studied in this thesis.A single transmitter channel is designed and tested,and a multi-channel transmitter array is tuned and tested by OTA in a small microwave anechoic chamber.Based on the characteristics of the Q band millimeter wave transmitter,super-heterodyne structure is used in the single channel transmitter module,imaging suppression scheme is implemented.The transmitter scheme is verified by link simulation of ADS,and the design and test of single transmitter channel is completed.According to the results of single channel measurement,this transmitter has the gain of 25dB and gain flatness less than 3dB within 400MHz bandwidth at center frequency.On this basis,the research on millimeter wave transmitter array for Q band is carried out.The 2x8 transmitter array has been constructed based on RF front-end,IF amplification and power management module.After tuning performance of individual channels,the measured channel gain is 20dB and all channel have gain flatness less than 3.8dB in 41-42GHz.With the cooperation of Keysight Technology,simulation and OTA test of antenna spatial pattern for transmitter array with 1x8 channels show the similar results.At frequency of 39GHz,the EVM of this array is better than 4.2%with the symbol rate of 50Msps.1OOMsps?200Msps and the modulation of 16-QAM or 64QAM.