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Effectiveness of using multiple AT coils as pairs for improving the depth–spread. The composite coil structure is shown in the top left corner, with the red arrows showing each coil’s current direction. In this design, two 80° tilted coils with an internal angle of 20° form a pair; the proposed coil design is comprised of two of these pairs with opposite polarities and an internal angle of 60°, and the coil O.D. changes from 4.5 to 30 cm with 1 cm winding width.
