| The paper summarizes the structure of spaceborne deployable paraboloid antenna inland and outland, and introduces the state-of-the-art about several large spaceborne deployable paraboloid antenna outland in detail. And then analyzes the limitations of spaceborne structure designed inland. It points out the problem of antenna structure design and its necessity and significance as well. Based on the electromechanical coupling property of large spaceborne developing antenna, the article shows an analysis of the structural-thermo-electromagnetic coupled problem of a large spaceborne deployable paraboloid antenna with the diameter of 12m and 108m, with the sequence coupling analysis method.Use parameterized modeling method and ANSYS software to make a finite element modeling for the large spaceborne deployable paraboloid antenna, and then put the finite element modeling to I_DEAS software via program conversion. Use the TMG module to compute the key point's temperature when the antenna runs in the earth synchronous orbit. Based on ANSYS software it has the function to run several field coupling, to make the antenna's surface temperature distortion derivation, and to get antenna's node temperature distortion displacement at different moment. And use the least squares technique to paraboloid fitting the finite element node on the distorted antenna. Through researching common electromagnetic analytical method, we select FEKO electromagnetic analytical software to analyze and compute the distorting and distorted parabola feed.Seen from the result, antenna major lobe becomes wide, antenna minor lobe becomes high, at the far antenna minor lode position. Temperature distortion's major influence is antenna directivity diagram, and it can hardly influence antenna major lobe , which all dues to the influence from the sun's heat. The simulation result and the predicted situation is anastomose, which identifies the rationality of this analytical method.
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