Evaluating short magnetic antennas in terms of electric wire antennas theory

摘要

The magnetic field pattern around ferromagnetic objects of large permeability is similar to the electric field pattern around conductive objects, if the shapes of the magnetic and electric objects were identical. Hence, the MMF behaviour in the gap between two ferromagnetic arms immersed in a magnetic field is similar to the open circuit voltage of a short electric dipole antenna immersed in a similar electric field. The experimental work demonstrates that the affinity between the electric and magnetic cases exists both in uniform and also in non-uniform surrounding fields (electric and magnetic). The experimental results support the results obtained by the theoretical evaluation. Furthermore, we show that the present work developments are of value in interpreting the results of measurements performed by employing ELF and ULF cored search coils in probing non-uniform magnetic fields.