| The application of millimeter wave radar to ensure driving safety has reached a consensus in the field of vehicle safety at home and abroad.As an important sensor of intelligent driving technology,it helps to give the driver a better physical and mental experience under the premise of ensuring the safety of the vehicle and improve driving pleasure.In this paper,based on the characteristics of vehicle radar antennas,a Substrate Integrated Waveguide(SIW)structure is used to study and design a 77 GHz millimeter wave vehicle-mounted angle radar antenna.At the same time,a 77 GHz SIW slot array antenna has designed,which can be applied to vehicle forward radar.Finally,the microwave monolithic integrated chip(MMIC)is used to design the circuit schematic diagram of the car corner radar and the RF front-end circuit of the 24 GHz car collision avoidance height measurement radar.The specific work content is as follows:1.Design of 77 GHz angle radar antenna.SIW has low electromagnetic leakage,easy planar integration and less crosstalk with the circuit after integration,which is suitable for high-performance radar.The antenna of the vehicle-mounted angle radar needs to have the characteristics of a wide beam in the azimuth plane,a narrow beam in the pitch plane and a low side lobe.Firstly,according to this goal,the parameter extraction model of the SIW slot antenna is designed.The slot parameters are extracted according to the Taylor distribution,the 1×14 unit SIW wide-side longitudinal slot resonant antenna is designed.Secondly,in order to facilitate the testing and system integration of the SIW antenna,the rectangular waveguide-SIW and microstrip-SIW high-efficiency transmission feed structures are designed.And the three-transmission and four-reception layout network is designed.Finally,the SIW angle radar antenna is processed and measured,simulated and measured results are in good agreement.The measured results show that the linear array antenna’s-10 dB bandwidth is 1.9 GHz(75.5-77.4 GHz),the gain is 12.2 dBi,the E-plane 3 dB beam width is 98.3 °,the 6-dB beam width is 148.4 °,and the H plane 3 dB beam width is 15.4 °.The lobe level is below-28 dB.2.77 GHz vehicle forward radar SIW array antenna design.The vehicle forward radar antenna has a narrow beam width,high gain,and low side lobe.Firstly,based on this goal,the characteristics of the sub-arrays of the 4 × 14 SIW array are analyzed.The sub-arrays need to have small mutual coupling and the radiation phases are superposed in phase.Secondly,the feed network of the array SIW power splitter is designed.The output amplitude and phase of the power splitter need to provide the low side lobe level of the E side of the array.Finally,the 4 × 14 SIW array antenna was processed and measured,the pattern of the simulation and measured results was in good agreement.The measured results show that the impedance bandwidth is 1.1 GHz(76-77.1 GHz),the maximum antenna gain is 17 dBi,the H-plane 3 dB beamwidth is 14.3 °,the side-lobe level is less than-34.6 dB,the E-plane 3dB beamwidth is 24.8 °,Sidelobe level-18.4 dB.3.Design of millimeter wave RF front-end transceiver circuit.Based on the Texas Instruments AWR1243 chip,the 77 GHz angular radar circuit schematic design was carried out.Aiming at 24 GHz altimetry anti-collision radar,BGT24MTR12 and HMC863LP4 E are used as core chips to design,process and test the 24 GHz RF front-end circuit.The measured output power is greater than 18.5 dBm and the output signal linearity is good,which meets the design requirements.Finally,three integrated methods are analyzed,and the coplanar integrated design of the side-feed antenna and the heterogeneous integrated design of the back-feed antenna are carried out.At 24-24.25 GHz,S11 and S22 are all less than-10 db,and the insertion loss is less than 0.7db,the simulation results meet the requirements. |
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