Considering surface’s random error and systematic error of reflector antenna

the difference of both errors is discussed by comparing Ruze formula

best-fit paraboloid and mechanical-electromagnetic-field coupling model.Since the deformation error is not concerned in Ruze formula

reflector’s precision is required too high sometimes so that the difficulty of antenna’s design and manufacturing is increased considerably.In contrast

the precision of the reflector required by the developed coupling model could be decreased.For the same surface precision

the higher electronic performance could be obtained by the coupling model than by Ruze formula.The experimental results of three antennas respectively are given to demonstrate the difference between them.In addition

the coupling model also paves a road for realization of mechatronics design of reflector antenna in engineering.