Optimal coils with zero mutual inductance for electromagnetic induction systems

Electromagnetic induction (EMI) systems often use separate transmit and receive coils. In these systems, it is desirable for the transmit and receive coils to have both minimal mutual coupling and a maximum field product, thus maximizing the detection depth. A mathematical representation is chosen for a pair of spiral coils that allows the coils to be optimized using an iterative convex method. This method, which is very fast, allows the coils to be optimized for the desired properties of minimum mutual coupling and a maximum field product. We then present results showing a pair of nonuniformly-wound, double-sided spiral coils.