Research And Design Of S-band Low Sidelobe Digital Multi-beam Antenna

Multi-Beam antennas are the focus of this article due to their increased height and flexible airspace coverage.This article takes the S-band multi-target tracking and receiving system as the background to research and design multi-target solutions and digital multi-beam antennas.(1)Study and discuss the implementation of multi-beam antennas,study the form of multi-beam antennas suitable for multi-target tracking systems from the working principle and structure,and choose digital multi-beam antennas as the solution from the perspective of the beam and the overall system gain.Based on the specific tracking distance,the scanning range of the antenna is determined to be the antenna elevation angle and the azimuth angle0°?360°,and the specific implementation index requirements of the S-band array antenna are given,and the space is beam decomposed,the space is beam-decomposed according to the principle of optimal coverage gain.The corresponding airspace is decomposed into 25 beams.(2)According to the index requirements of the array antenna,this report designed three different forms of circular polarization antenna.The first unit designed is a microstrip antenna that excites a circular polarization mode in the form of a single feed point,which has the characteristics of low profile and low quality.The second unit designed is a cross dipole antenna with a vibrator antenna,the vibrator has a symmetrical structure and a better circular polarization performance.The third unit designed is a conical double-arm spiral unit,which uses two antiphases to realize the in-phase superposition of the double-arm spiral.Considering the bandwidth of the standing wave,the axial ratio and the gain from scanning to the edge of the beam,the designed cross-shaped dipole antenna is selected for array arrangement.two feed networks of Wilkinson and Tare designed for comparison and simulation verification.(3)Analyze the array on the basis of the unit,choose the 4×6 form of antenna array arrangement,at the edge of the beam scan,the S-band antenna array gain is greater than19.5d Bi,analyze the Taylor and Chebyshev falling lobe method in the design of the array in this paper The applicability of using MATLAB programming to get the current excitation,and finally the antenna port standing wave ? 1.5,the sidelobe level ? 25 d B obtained by the simulation.And carried out physical processing,actual verification in a 3D darkroom.Finally,the full text is summarized and the next step of research is prospected.