as practiced in present un screened loop coils the preferred application of these coils are especially thin body coils bore tube integrated loop coils thin screened head coils and flat screened loop coils furthermore a new planar resonant patch array mr rf coil which is capable of three axis b 1 control including circular polarization is provided by the invention it can be realized by the above structures which can have three orthogonal fundamental resonance modes these modes can be tuned to the same rf frequency excitation of these modes by means of currents allows to control the rf excitation field b 1 field in three axis this includes the generation of circular polarization with a choosable normal direction a design example according to fig1 comprises a patch array of 6 by 6 metal plates or patches 1 each of 4 by 4 cm size placed 1 cm above a metallic ground plane pec 3 adjacent patch edges are connected by an edge capacitor the patch edges at the outer fringes of the array are connected with a fringe capacitor c f to a vertical circumferential metal strip 31 making the connection to the ground plane 3 two fundamental modes are substantially.