Wide band three-dimensional polarization selective electromagnetic murky diffusion spherical shell hyper-structure with a transmission band formed by subwavelength units

A Murky Diffusion Shell (MDS) hyper-structure is proposed and realized with an experiment showing its invisibility and its transmission function in the electromagnetic frequency range. A predefined spatial distribution is found to possess a completely different property with its homogeneous constructing unit cell, proving structure plays a prominent role. Thus we define MDS, which is analogous to a cloud of electromagnetic smoke or fog, as a form of new concept, a hyper-structure. Proper probability density is found to generate wide band low reflectivity in mono-static and bi-static observation angles. The directional structure in MDS also generates transmission characteristics with polarization, frequency, and azimuth selectivity to enable possible information communication with the outside for inclusion. MDS could easily fit in an arbitrary 3D or 2D shell shape with a smooth surface or a discontinuous edge, and does not need a PEC lining. MDS shell is fabricated and the experiment measurements show monostatic scattering reduction reaches well below -10dB with a bandwidth ratio of 69.3% and a bi-static scattering reduction that reaches well below -10dB with a bandwidth ratio of 82.8% when the PEC disk object is wrapped by MDS, which complies with the simulation results.