A common solution for the transmitter coils in dipolar C shaped magnets is a couple of D-shaped resonant coils on each pole. The RF field parallel to the planes of the poles is produced by the straight current filaments and the return currents, represented by the circular arcs, give unwanted contributions. We avoided such effect by building a transmission line transmitter in the form of straight resonator strips (for a similar approach for receiving antennas see [1,2]).
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