Edge-On Backscattering Augmentation Design of Thin Conducting Plate Based on Dielectric Resonator
The quasi-superdirective reradiation based on the magnetic dipole resonance occurring within a passive dielectric resonator is presented to augment the backscattering cross-section of thin conducting plates at edge-on incidence.It is demonstrated that a hybrid electromagnetic resonance mode reradiating like a magnetic dipole can be induced within a properly dimensioned cuboid dielectric under the illumination of a plane electromagnetic wave.Using this cuboid dielectric as a basic unit cell,a supercell consisting of two identical dielectrics closely cascaded along the propagation direction of the impinging wave is formed.It is observed that both the magnetic and electric fields induced within the two dielectrics of the supercell exhibit opposite senses along with almost equal magnitudes.Because of the internal field distribution with opposite phases and almost equal magnitudes,the supercell acts as a two-element quasi-superdirective magnetic dipole array and the resultant quasi-superdirective reradiation effectively contributes to the backscattering cross-section enhancement.Further,the supercells with halved profile are loaded onto the surfaces of thin conducting plates according to the image theory.The results indicate that the magnetic-dipole-based quasi-superdirective reradiation assisted by dielectric resonators with a profile of only 0.078λ0 noticeably modifies the edge-on scattering characteristic of thin conducting plates.Effective augmentation of backscattering cross-section for edge-on incidence is therefore achieved within relatively wide band and angular ranges.
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