Improvement of Surface Waves Attenuation Performance With a Magnetic Thin Film Loading

In this paper, the propagation property of surface electromagnetic waves of a composite structure realized by a grounded dielectric slab covered by a magnetic thin film is analyzed. Based on the method that the magnetic thin film is modeled with the impedance boundary condition, the transcendental equations are derived and are solved using iterative techniques. The attenuations of surface waves are shown for a representative geometry. It is found that the use of the magnetic thin film results in a significant improvement of the surface electromagnetic waves attenuation performance at low frequencies but almost no contribution to the whole thickness. In addition, the cutoff frequency of propagating surface waves can be increased by adjusting the magnetic susceptibility.