Low-cost RF Front-end Design Of K-band Ultra-low Altitude "low, Slow And Small" Target Detection Radar

At present,the LSS-Target(low,slow and small target)detection radars on the market mostly use phased array pulse system,with long detection distance and high ranging accuracy.However,because of too many TR components,the highly cost and the ranging blind areas of0 ～ 100 m,it cannot meet the application requirements of ultra-low-altitude alert protection in some areas such as conference venues and grassroots organizations.Based on the above research background,following research work on the RF front-end of the K-band ultra-lowaltitude LSS-Target detection radar was studied in this paper:(1)Aiming at the application background of ultra-low-altitude LSS-Target detection in this subject,a linear frequency modulation continuous wave detection working system was selected,and RCSs of two typical LSS-Target targets in K-band were measured and simulated respectively.The overall front-end design of the BGT24ATR12 low-cost RF transceiver chip was proposed,and the design indexes of the RF front-end based on the radar detection index requirements were demonstrated.(2)Passive circuit was designed according to the overall front-end scheme and design requirements,which includes a dual-receiving microstrip array antenna(including a radome),a substrate integrated waveguide(SIW)bandpass filter,and a microstrip hybrid loop power Synthesizer.Aiming at the contradiction between the antenna transmit and receive isolation index and size,a coplanar compact electromagnetic band gap structure(UC-EBG)was designed between the transmit and receive antennas,which effectively suppressed the coupling effect between the transmit and receive antennas.(3)Aiming at the problem that the power output and noise figure of the BGT24ATR12 chip cannot meet the requirements of the front-end indicators,a power amplifier circuit and a low noise amplifier circuit were separately designed.The overall design of the RF transceiver circuit with the bandpass filter and power synthesis was completed based on the test of the separate board.In addition,the design of the front-end power management system and the intermediate frequency amplifier circuit was also completed.(4)The transmission and reception performance of the RF front-end was tested,and its output power and sensitivity basically met the design index requirements.A 90 ° vertical interconnect structure based on the performance verification was designed and simulated to solve the problem that the RF modules were separated from each other.The microstrip array antenna and the RF transceiver circuit were integrated on the microwave hybrid substrate to realize the integrated front-end design.