Patent ID: 9548537
Date: 2017-01-17
CPC Classifications: A61F,H01Q,H04B,H04R

Claim:
1. A magnetic field transmitter generating a time varying magnetic field in response to a time varying input signal, comprising: a) a transmitter coil winding constructed of continuous conductor loops, having an inner perimeter and an outer perimeter separated by a distance, the transmitter coil winding having a coil winding resistance R and a coil winding inductance L, the inner perimeter of the loops of the transmitter coil winding, the coil winding resistance and the coil winding inductance being selected such that: b) a backing plate of low reluctance magnetic material having an upper surface and a lower surface, the lower surface of the backing plate being attached in close proximity to a lower surface of the transmitter coil winding, the backing plate having an outer perimeter that is approximately coincident with the outer perimeter of the transmitter coil winding.