The Development Of Eight-millimeter Wave Integrated Anti-collision Radar Front End

Nowadays,with the development of the information society and the continuous improvement of the production capacity of various transportations,traffic safety has gradually become the focus attention of the publics,and collisions are the main cause of many ground and air traffic accidents.Therefore,collisions avoidance systems are critical to present traffic and aircraft safety.The background of the era of Internet of Everything is focused in this paper,and an eight-millimeter wave integrated anti-collision radar frontend system is developed.The development process of the entire eight millimeter wave anti-collision radar system is describeyhd carefully in this paper.This subject starts from the overall plan,and the working system of the eight-millimeter wave anti-collision radar is determined to be FMCW(Frequency Modulated Continuous Wave),then the overall metrics for the entire front end is planned,and the overall scheme of the entire eight-millimeter wave integrated anti-collision radar front-end is designed under the technical indicators.In the research and development of T/R components,the first step is the research and development process of passive components in the eight-millimeter band,a 34-36 GHz circulator is selected,its insertion loss is less than 0.18 dB and isolation is better than 27 dB.The substrate integrated waveguide filter is studied in this subject,after the effects of each parameter is analyzed,several types of eight millimeter wave substrate integrated waveguide filters are designed and simulated in this paper,and a comprehensive comparative analysis is carried out in this subject,finally an eight-millimeter wave substrate integrated waveguide filter is developed,its tested center frequency is 34.95 GHz and bandwidth is1.45 GHz.Meanwhile a waveguide microstrip conversion structure is developed for connecting the circulator and the integrated eight-millimeter wave microstrip circuit,and its insertion loss is less than 0.1dB and return loss is more than 15 dB,the eight millimeter wave splitter has also been researched and simulated with two distribution ratios.The amplifier affects the overall core indicators for nonlinear devices in T/R components,the material selection of LNA and PA MMIC is GaAs,and a low noise amplifier applied to eight millimeter waves is developed based on the analysis of the amplifier theory,its tested noise figure is less than 2.72 dB and gain is more than 20.0dB.A power amplifier that can be used in the eight-mm band is simulated,its gain is more than 25 dB and return loss is more than 25 dB.The choice of mixer MMIC is a miniaturized passive double balanced mixer,and a lumped-parameter LC low-pass filter with 1.45 GHz passband range is intergrated at the IF output of the mixer in the receive branch.Finally,various components are successfully developed and their performance meet indicator requirents,all the discrete devices in the whole system are integrated together into a shielding box of 63 mm × 58 mm × 23 mm,and some core indicators are tested,the system’s noise figure is less than 3.45 dB,the transmission power is more than 15.5dBm,and the working bandwidth is 1.45 GHz.It lays a solid foundation for the next step of developing high-performance airborne millimeter wave anti-collision radar.