<FONT face=Verdana>For the problem of electromechanical separation and negligence of feed position error in reflector antenna design. From the angle of electromechanical coupling

the distortion of main reflector and position error of feed were introduced in the formula of antenna’s far field pattern. So the effect of structure parameters including feed support structure on the main electrical parameter (such as gain

side lobe

beam width

pointing accuracy) could be researched. Due to the proposed formula

a new electromechanical coupling optimization model of whole antenna including feed support structure parameters was proposed. Simulation was done via an 8m reflector antenna. Result shows that the optimization model is more efficient than tradition ones. Finally the proposed optimization model is applied to a 40m reflector antenna with good results.