The radiation from an electrically small off-centered loop in a dissipative homogeneous spherical medium

Conclusion

It was found theoretically again that the increase in the received field strength after an electrically small loop embedded in a biological body was possible when the loop was off-center. The direction of the magnetic dipole of the off-centered loop should be perpendicular to the radial axis to give a stronger radiated maximum power density. For a loop close to the surface of the sphere, the frequency of the transmitter can be optimized to have stronger power density such that the diameter of the sphere should be an integer times the effective wavelength of the medium. Given the loss tangent, effective wavelength in the medium, and diameter of the sphere, the maximum power density of the loop close to the surface of the sphere is stronger than that of the loop at the center and can be predicted theoretically, as shown in Fig. 2.