Structure Design and Thermal Deformation Analysis of Large Spaceborne Flat Slotted Antenna

Large spaceborne flat slotted antennas recently boom rapidly in the field of space applications. The structural element of large flat slotted antenna is introduced. A new connected scheme of antenna is put forward and unidirectional floating fixing method is applied to outside four flange of antenna. This fixing method could ensure that antenna move along one certain direction freely when temperature rises or drops. Thermal deformation is analyzed in ultimate high temperature and ultimate low temperature. The results are thermal deformation RMS value in Y direction decreases from 0.53 mm to 0.3 mm in ultimate high temperature and decreases from 0.33 mm to 0.1 mm in ultimate low temperature. It shows that the thermal deformation RMS values satisfy the design requirements on board, so electrical performance can be assured.