Simulation Analysis Of Compound Technology Based On Paraboloid Infrared And Millimeter Wave Metal Grid

With the rapid development of modern computer technology and electronic confrontation,traditional single-mode guided weapons can not adapt to the environment of modern battle field due to its self-defects.The multiple modes guided weapon has gradually appeared on the stage history with the advantages of combining multiple frequency bands,and has become a new generation guidance technology developed by various military powers.As one of the key technology in the field of multiple mode guidance,the beam combiner has the extremely important research status.The infrared/millimeter wave double beam combiner is considered to be one of the most promising research directions.As to the problem of supplying multiple modes seeker with a beam of infrared and millimeter wave.The key technology of the high infrared signal transmission and reflection of millimeter wave signal beam combiner and the main research results summarized as the following several parts:First of all,summarizing the existing types of beam combiners in domestic and foreign and generalizing their advantages and disadvantages,the structure types is determined,their system composition and working methods is described.Introducing the basic principle and technical indicators of infrared/millimeter wave beam combiner.After comparing and analyzing several collimation and recombination schemes,the infrared/millimeter wave combiner structure of the parabolic metal mesh grid is designed and optimized according to the requirements of the technical specifications and the grid structure of the infrared/millimeter wave optical-electrical Characteristic.The overall structure consists of an infrared collimation system,a millimeter wave collimation system and a beam combiner.Using electromagnetic simulation software combined with finite-difference time-domain(FDTD)and finite element method(FEM),this system is theoretically analyzed and simulated.Secondly,based on technical indicators,optical collimation system of the 3-5microns band infrared beam is designed,and on the basis of this system,the off-axis parabolic metal mesh structure is simulated.According to Fourier transform,diffraction imaging and other principles,the infrared collimation system with off-axis metal grid is analyzed for light intensity distribution,imaging position,imaging resolution,the contrast of image and signal-to-noise ratio,and metal grid infrared transmission.A mathematical model of a parabolic metal grid is established for the millimeter-wave collimation system.Based on the equivalent circuit theory,theshielding effectiveness of the system for millimeter-wave signals is simulated and analyzed.The effect of metal mesh processing error on the beam phase of millimeter beam is analyzed.The influence of parabolic metal mesh on millimeter beam diffraction is studied.Giving the effect of the static electromagnetic field distribution of a millimeter wave reflection system.Finally,The problem of contradictory parameters between infrared and millimeter wave systems are analyzed.Based on the simulation results and theoretical calculations,the reasonable parameter design scheme of infrared/millimeter wave system is given,that can make the system better transmit infrared signal and have good millimeter wave shielding properties,which will finally realize the better quality common-path infrared/millimeter wave collimated beam.