Research On Effcet Of Wing Torsion Deformation On Electromagnetic Characteristics Of Airborne Antennas

With the development of aviation technology,flexible large-wingspan aircraft has been more and more widely used in high-altitude and long-time flight due to its high aerodynamic efficiency.The wing load and the external aerodynamics make the light-weight and flexible large-span wings more likely to twist and deform during flight.The torsional deformation of the wing may bring a series of effects,such as changes in the RCS of the aircraft,distortion of the airborne antenna pattern,etc.In order to study the regular pattern of influence,this thesis selects some typical scenarios for calculation and analysis:the effect of wing deformation on the RCS of the aircraft under different incident angles in the scattering problem,and the effect of wing deformation on the integrated radiation pattern of two common forms of airborne antennas,the spine airborne antenna and the wing antenna in radiation problem.The electromagnetic field numerical calculation method is combined with the mechanical deformation of the wing to model and analyze it.The quadrilateral meshing of the undeformed wing and array antenna is modeled by the bilinear curved surface and line structure of the higher-order moment method,and the wing mesh model is modeled by mechanics software to give it mechanical materials attributes and loading deformation load,to achieve the torsional deformation of the wing.When studying the effect of torsional deformation on scattering,it is found that as the plane wave incidence angle changes from the wing direction to the nose direction,the maximum of RCS increases due to the increase in the degree of deformation.The more obvious the degree is,and the greater the impact on the plane where the maximum is.Simulation analysis of the radiation characteristics of the airborne antenna after torsional deformation found that when the main lobe of the microstrip yagi antenna array pointed to the nose,each torsional deformation had no effect on the directional pattern,and when the main lobe of the array pointed to the wing,the E-plane pattern,there is basically no effect,and the direction of the H-plane pattern becomes worse as the degree of deformation increases.For a microstrip Yagi antenna array in the form of a wing antenna,as the degree of deformation increases,the gain of the antenna array decreases and the main lobe beam direction is deflected.At the same time,in the same deformation degree,the wing antenna has the same H-plane pattern as the plane.The fuselage does not affect the H-plane,but the gain is reduced compared to the antenna array,the directivity becomes worse.