| Wireless communication technology has been popularized in all aspects of people's lives with the rapid development of information today,radio frequency antenna as an important component of wireless communication system,the radiation characteristics of antenna will affect the performance of wireless communication system directly.The future of RF antennas will move towards miniaturization(reduce the size of the antenna under conditions of constant antenna characteristic),integration(integration with RF modules),high performance(multi-band,beam scanning,broadband,low crosspolarization level,high gain,low sidelobe).Microband patch antenna is the most basic and most commonly used antenna form,compared with other antenna forms,microband patch antenna has the advantages of convenient processing,easy integration with circuit design,low cost and ability to operate in multi-polarization,multi-frequency mode and other advantages.Based on the basic theory of microband patch antenna and the integrated method of array antenna,this paper analyzes the integrated layout of string feed antenna array,threebeam fused antenna array and antenna vehicle radar,and does the following work:(1)A micro-belt patch line array antenna with a string feed 10 unit is designed,the antenna operating frequency is 77 GHz,the gain of the line array antenna is 15.2d Bi,the mainlobe width of E-plane is 11.2 degrees,and the sidelobe level of E-plane is-24.3d B.At the center frequency 77 GHz frequency point,S11 is-35.2d B,the impedance bandwidth is much greater than 1GHz,and the simulation results meet the design index requirements.Based on the line array,2×10 planar array and 6×10 planar array are designed,of which the gain of 2×10 planar array antenna is 17.8d Bi,the H-plane mainlobe width is 38.5 degrees,6×10 planar array antenna is 20.2d Bi,and the H-plane mainlobe width is 17 degrees.(2)In order to meet the testing requirements of the W-band antenna,a waveguidemicrostrip probe transition structure is designed,the insertion loss of transition structure is less than 1.6d B in the 75-82 GHz band,and the test results of the S11 parameters meet the requirements.At the same time,based on the detection needs of rear radar on the side,rear and side rear of the vehicle,a three-beam-shaped antenna is designed,with three beams pointing in the direction of-45 degrees,0 degrees and 45 degrees.(3)The antenna and the vehicle radar are integrated design,the layout of the antenna and the selection scheme of the hardware are designed based on TI's AWR1843 model radio frequency chip(3T4R),and then the antenna radiation direction map and radar multi-target detection test are carried out on the processed detection radar,and the test results meet the requirements. |
PDF Full Text Request