Design of Artificial-Material-Based Antennas Using Inverse Scattering Techniques

Inverse Design of Artificial Materials Based Lens Antennas through the Scattering Matrix Method

“…It is worth highlighting that a number of advantages are in order in using I-SMM rather than the usual inverse scattering formulation [26] for the design of artificial-materials-based devices. First, by virtue of the embedded SMM, the I-SMM is more efficient with respect to [26] from a computational point of view.…”

“…It is worth highlighting that a number of advantages are in order in using I-SMM rather than the usual inverse scattering formulation [26] for the design of artificial-materials-based devices. First, by virtue of the embedded SMM, the I-SMM is more efficient with respect to [26] from a computational point of view. In fact, in [26] we were forced into a very fine discretization of the region of interest in order to accurately represent the small circular inclusions at hand, while in this case the computational burden just depends on the number of cylinders and on their diameters.…”

“…the dielectric permittivity of a lens) in such a way to realize the given field (or power pattern) specifications. Recently, a design approach based on the ISP in conjunction with artificial material technology was proposed in [26]. By still adopting the contrast source inversion (CSI) [27] method for the solution of the ISP, in [26] the possibility of enforcing desired properties on the permittivity distribution, as well as of realizing multi-modality lenses, was explored for the first time.…”

“…Recently, a design approach based on the ISP in conjunction with artificial material technology was proposed in [26]. By still adopting the contrast source inversion (CSI) [27] method for the solution of the ISP, in [26] the possibility of enforcing desired properties on the permittivity distribution, as well as of realizing multi-modality lenses, was explored for the first time. Last, but not least, it has been shown that the adoption of a proper representation basis for the unknown, allowing for the direct synthesis of an artificial-materials-based lens, is able to overcome results based on the search of a smoothly varying profile followed by homogenization procedures.…”

On the Use of Electromagnetic Inversion for Metasurface Design

“…The inverse scattering algorithm allows us to limit the solution space to purely isotropic dielectric lenses. In this situation, the solution to the mathematical problem may not exist; however, the inverse scattering algorithm may still result in an acceptable solution [24]. Finally, the instability of the mathematical problem is related to the so-called smoothing effect [29] of the free space Green's function operator, which acts as a low-pass filter for high spatial frequency information.…”