Q-band Point-to-point Mobile Communication Transceiver Module

The millimeter wave transceiver front-end is a core component of the millimeter-wave wireless communication system,which crucial indicators directly affect the working status of the entire communication system.This thesis introduces the application scenarios of millimeter wave wireless communication based on the characteristics of millimeter wave.The Q-band is one of the atmospheric windows with small attenuation of millimeter wave transmission.High-speed long-distance point-to-point wireless communication can be easily realized by high-gain antennas,which has great application prospects.This thesis introduces a Q-band point-to-point wireless communication transceiver front-end.Firstly,the characteristics of point-to-point wireless communication technology is briefly introduced,and several common wireless communication transceiver architectures and frequency synthesis implementation methods are analyzed.Then propose the entire system design according to the target indicators,the whole system is divided into two pilot-frequency transceivers with low local oscillator and high local oscillator,and the design of the two transceivers is substantially the same.The transceiver front-end is divided into five modules by modular and hybrid integration,which are millimeter wave transceiver module,frequency source module,intermediate frequency channel switching module,intermediate frequency module and power supply and signal processing module.The transmitting and receiving frequencies of the low local oscillator pilot-frequency transceiver front-end are 41GHz±375MHz and 37GHz±375MHz,respectively,the high local oscillator pilot-frequency transceiver front-end has the opposite operating frequency.The transmitting link adopts an up-conversion structure,and the intermediate frequency(IF)signal is 3.2 GHz±375 MHz,the PLL generates a 9.45GHz/10.05 GHz signal and doubles the frequency,then up-converts the IF signal,the RF signal is amplified by three stages and output by the circulator to the antenna.The receiving link use harmonic mixing,Phase-locked loop output signal is multiplied by one time,afterward down-converting with the received RF signal to 0.8GHz ± 375 MHz,increasing the dynamic range of the receiver by the AGC loop of the IF module,finally IF is sent to the baseband processing.In this thesis,the each module circuit are analyzed,fabricated,tested,and cascading tests on the entire link.Transmit link cascading test indicates that the output power and 1dB compression point are greater than 17 dBm and 21 dBm,respectively.The local oscillator suppression is better than 60 dBc,the in-band power flatness is 2dB,the spur suppression is greater than 50 dBc,and the phase noise is better than-67dBc/Hz@1KHz,-82dBc/Hz@10KHz,-85dBc/Hz@100KHz.The receive link gain is greater than 70 dB,the noise figure is lower than 5dB,the AGC dynamic range is exceed than 30 dB,the RF out-of-band rejection is greater than 50 dBc,and the spurious suppression in the IF-band is better than 30 dBc.Finally,the circuits were improved and the whole transceiver system is tested.The results show that the entire communication system can meet the 16 QAM modulation requirements.