ULTRA-LOW-PROFILE LOW FREQUENCY ANTENNA

摘要

The antenna includes a magnetic core (10) having coil winding channels in three intersecting axial directions orthogonal to each other, defining X-axis (X), Y-axis (Y) and Z-axis (Z) orthogonal to each other, receiving respective X-coil (DX), Y-coil (DY), and Z-coil (DZ), wherein a Z-coil winding channel (12Z) surrounds the magnetic core (10) around the Z-axis (Z), providing partial grooves (40) confined between two parallel surfaces. The thickness of the magnetic core (10) in the Z-axis (Z) direction is of less than 1,2 mm and each partial groove (40) has a width in the Z-axis (Z) direction equal or less than 0,4 mm and the depth of each partial groove in a radial direction perpendicular to the Z-axis (Z) is at least two times of its width. The Z-coil (DZ) is wound within said groove (40) and extends radially from 1/3 to 2/3 of the depth of the groove (40) and the outer edge of the Z-coil is at a distance of the entrance of the groove (40).