Diffraction by a small aperture in a conducting screen in the presence of ferrite spheres

A theoretical study is presented of electromagnetic wave diffraction by an aperture in an infinite ideally conducting screen with saturation-magnetized ferrite spheres on both sides; this effect can be exhibited by such ferrite devices as strip filters, tunable solid-state oscillators, and power limiters. A solution is obtained under the assumption that the sizes of ferrite specimens, the size of the aperture, and the distance between them, are small in comparison with the length of the diffracted wave. Experimental results are presented and discussed for the case of YIG spheres with a ferromagnetic resonance band.