Research And Design Of High-performance Airborne Array Antennas

In recent years,airborne antennas have developed rapidly and been widely used in various fields.The airborne antenna is the"eye"of the airborne system,and its performance determines the working status of the entire system.Combined with project requirements,a low-profile airborne antenna and two wide-beam airborne antennas are designed.The main work of the paper is as follows:In chapter 3,an airborne low-profile panel antenna is designed.The antenna element is designed according to the principle of the microstrip antenna cavity model.Through Shorting arm loading and magnetic material ferrite loading,the antenna profile height is only7.5mm(0.01?,?is the wavelength of 400MHz).The operating frequency band of the antenna is 380MHz?440MHz.The left-handed circular polarization is realized in the operating frequency band by the single feedpoint.The antennas are composed of 2×8 arrays and processed for measurement.The results show that the standing wave matches well and meets the requirements of the project.In chapter 4,two airborne wide-beam magnetoelectric dipole antennas are designed.An array element adopts a double-layer magneto-electric dipole antenna,in which the lower magneto-electric dipole adopts bending technology to miniaturize the antenna,and the upper layer is loaded with(38)-shaped magnetoelectric dipole to expand the antenna beam width.Another type of magnetoelectric dipole antenna broadens the beam width by folding the horizontal electric dipole.The array antennas are placed on the front and rear sides of the wing beam,with 800 elements on each side.This paper only simulates a single-sided array.The array is optimized by Covariance Matrix Adaptation Evolution Strategy(CMA-ES)algorithm to reduce antenna sidelobes.The simulation results show that the active VSWR is below 2 at frequencyf_t(f_t is the operating frequency),the array gain reaches 30d Bi at various scanning angles,and the sidelobe level is less than 14d B.Meet the requirements of project.The final machining test,verifies the accuracy of the antenna from design to simulation.