I am interested in increasing the range of NFMI - near field magnetic inductions, used in hearing aids.
However the limiting factor is a range of 10cm, typically seen in hearing aids with a coil diameter of 1.5mm.
According to the magnetic field strength formula
According to the formula: A desired magnetic field intensity(B), can be achieved at an increased distance(r) of 100cm, with a radius(a) increase of 31.7 times the initial radius
Am I right in assuming this, or will there be practical problems/ unseen effects for such an antenna with large radius to work with magnetic induction of low frequencies such as 10MHz.