Structural Deformation And Electrical Performance Analysis Of Spaceborne Active Phased Array Antennas

Spaceborne active phased array antennas serve as the "eyes" and "ears" of satellite systems such as space communications,navigation,electronic reconnaissance,and environmental monitoring.On the one hand,they meet the requirements for the structure and performance of spaceborne information equipment and have a large physical caliber,lighter weight and antenna structure that can be expanded and collapsed,on the other hand,it meets the requirements for the electrical performance of space-borne information equipment,with higher antenna gain,fast beam scanning,longer range and more beam forming,etc,has become one of the key equipment in the field of spaceborne antennas,and has very broad development prospects and important application values.(1)Aiming at the problem of rigid-flexible coupling between the central rigid body and the flexible antenna,a finite element model of the whole star system of the phased array antenna-satellite body-solar wing windsurfer is first established based on the given model analysis parameters.Then the antenna system is structurally optimized,and the modal and dynamic response analysis of the established whole star system model is performed.The structural deformation of the satellite antenna under its own maneuvering conditions is solved.Finally,analyze the variation of RMS(shape surface accuracy)of phased array antenna array with time;(2)Aiming at the problem of structural thermally induced deformation of satellite systems in space,this article first introduces the on-orbit thermal analysis environment of spaceborne antennas and the main heat transfer methods of spacecraft in space.Then,the thermal analysis software is used to simulate the space environment of the satellite system in orbit,and the temperature field analysis of the antenna system while in orbit is realized.Then,based on thermal analysis and elastic deformation theory,the thermal deformation of the antenna structure under the condition of space thermal load is studied,and the influence of the space thermal environment on the mechanical properties of the antenna is explored.Finally,analyze the variation of RMS(shape surface accuracy)of phased array antenna array with time;(3)Aiming at the impact of antenna structure deformation on the electrical performanceof the antenna,this article first introduces the radiation mechanism and feeding method of the microstrip antenna,and designs the structure for the spaceborne microstrip antenna unit with a center frequency of 5.4GHz and operating in the C band.The size of the antenna unit is determined by analysis and optimization.The basic theory of the microstrip array antenna is introduced,the arrangement of the element array and the feeding method are determined.Finally,the electromagnetic field analysis software is used to calculate the influence of the antenna structure deformation on the electrical performance of the antenna;...