We have been investigating a modular antenna reflector to reduce the cost and time for designing, fabricating and testing. In this modular antenna, the displacement errors at the connecting points cause the shape distortion including the alignment error. In this study, we propose an error estimation method which calculates the variance of the displacements. By using this method, we calculate the error variance for a modular structure when we change the number of modules and the way of connecting modules. Considering the result, it is represented quantitatively that the shape distortion is reducing by mutual two dimensional constraints and elasticity.
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