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We investigate the distribution of electromagnetic body force in a fluid boundary layer produced by a coplanar waveguide(CPW)and focus on the fluid dynamic control effects of a rudder.The electromagnetic body force along the CPW direction can be created by the mutual coupling of landscape orientated electric and magnetic fields.With CPWs arranged on the rudders surface,a direct-force-control rudder can be realized by adjusting the microwave sources.It is also found that a streamwise microwave electromagnetic body force can markedly enhance lift force and suppress rudder vibration,thus improving response time lag significantly.Fhrthermore,navigation stall caused by a large angle of attack can be avoided.