Research And Fabrication Of Front-end Of E-band 4D Millimeter Wave Radar

As an important part of vehicle safety,millimeter wave anti-collision radar promotes the development of intelligent transportation.Among them,4D millimeter wave radar has attracted wide attention because it can accurately measure the pitching Angle and realize point cloud imaging,and has higher resolution and accuracy than traditional millimeter wave radar.Through the study of E-band 4D millimeter wave radar front-end circuit,the following design work is completed:1.Design of multi-channel cascade scheme.By comparing many main manufacturers,TI's AWR1243 is selected as the transceiver chip.2.Design of RF module circuit.Based on the principle of power splitter,the Wilkinson power splitter used in local vibration power splitter network is designed.The insertion loss is about 3.2d B,the return loss is about 27 d B,and the port isolation degree is about 33 d B.By loading open branch microstrip lines into the half-wave resonator,a microstrip filter applied to cross channel is designed,which achieves low insertion loss in the RF and local oscillator channels of the chip,and inhibits the signals of the cross channel,ensuring the signal purity of the respective channels.3.Antenna array element and layout design.Firstly,the principle of microstrip antenna and array antenna is introduced.According to the design index,the design index of antenna is calculated based on the principle of basic radar equation.The current distribution of Dolph-Tchebyscheff is applied to the design modeling and simulation of microstrip linear array and surface array antenna with 79 GHz center frequency.Then combining the concept of minimal redundant array with the principle of MIMO,a simple method to determine the minimum redundant array is proposed and applied to the antenna layout.Then MUSIC algorithm is used to verify the rationality of the layout design.Finally,the RF module circuit and antenna module are simulated as a whole,and the simulation results also meet the design indicators.4.Design schematic diagram and PCB layout.Read the user manual of AWR1243,according to the power requirements of the system and the design requirements of other peripheral circuits,conduct device selection and schematic design,and draw PCB layout.5.Test and verify.The feasibility of the E-band 4D millimeter wave radar frontend circuit is further verified by testing the transmitter bandwidth,direction diagram and basic performance of the radar.