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Transmitter with improved sensitivity and shielding

  • US 9,548,537 B2
  • Filed: 06/09/2015
  • Issued: 01/17/2017
  • Est. Priority Date: 08/29/2012
  • Status: Active Grant
First Claim
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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;

    i) the inner perimeter circumscribes an effective coil area in a range between 0.79 in2 and 4.9 in2;

    ii) the coil winding resistance and the coil winding inductance produces a break frequency fb for the transmitter coil winding of between 20 Hz and 2000 Hz, where the break frequency is defined by the formula fb=R/(2π

    L) wherein the coil winding resistance R is defined by the formula R=ρ

    l/A and the coil winding inductance L is defined by the formula L=N2 (uo π

    Re)/2; and

    iii) the loops of the transmitter coil winding having an annulus width and an annulus depth which are each smaller compared to a distance from a center of the loops of the transmitter coil winding to the inner perimeter of the loops of the transmitter coil winding; and

    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.

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