Filippo Costa

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In this paper a planar electromagnetic absorber is introduced whose performance is maintained over a wide change of the incidence angle for both TE and TM polarization. The absorber comprises an array of patches over a grounded dielectric slab, with clear advantage in terms of manufacturability. It is shown that a high value of the relative permittivity of(More)
A novel chipless RF identification based on a multiresonant high-impedance surface is proposed. The structure is based on a finite metallic frequency-selective surface (FSS) comprising 2 × 2 (30 mm × 30 mm) or 3 × 3 (45 mm × 45 mm) unit cells. The FSS unit cell is formed by several concentric square loop resonators. The thin(More)
The paper describes a method to combine the information on the number of citations and the relevance of the publishing journal (as measured by the Impact Factor or similar impact indicators) of a publication to rank it with respect to the world scientific production in the specific subfield. The linear or non-linear combination of the two indicators is(More)
Metamaterial absorbers synthesized by extremely-thin High-Impedance Surfaces (HIS) are analyzed by resorting to a simple transmission line model. The equivalent circuit representation, which takes into account also the high-order Floquet modes effects, allows to interpret the absorption properties of the analyzed structure and to derive closed form(More)
A reliable encoding/detection scheme for chipless radio frequency identification (RFID) tags, free from any normalization procedure, is presented. The key strategy of the present approach consists in storing the information in the difference between vertically and horizontally polarized reflection coefficients of a completely passive tag. The measured(More)
In this paper deals, an equivalent circuit model of high impedance surfaces (HIS) employing arbitrarily shaped Frequency Selective Surfaces (FSS) is presented. The conventional modelization of the HIS based on the averaged expressions for FSS impedance reveals sufficiently accurate both for normal and oblique incidence for simple FSS shapes, such as(More)
A simple approach to estimate the surface impedance of a thin ink deposition on dielectric substrates is described. The measured sample is transversally accommodated in a waveguide, and the scattering parameters are measured. Then, the surface impedance value is recovered by recurring to an efficient transmission-line approach. Closed-form relations are(More)
We present three monolithic metamaterial-based THz bandpass filters, the skewed circular slot rings, meandered slots and Jerusalem cross slots, to fit in the THz gap. These THz bandpass filters are comprised of a metal-dielectric-metal (MDM) structure that supports multiple resonances of electric dipole, magnetic dipole, and standing-wave-like modes. By(More)
A methodology to obtain wideband scattering diffusion based on periodic artificial surfaces is presented. The proposed surfaces provide scattering towards multiple propagation directions across an extremely wide frequency band. They comprise unit cells with an optimized geometry and arranged in a periodic lattice characterized by a repetition period larger(More)
Multi-resonant metamaterial absorbers based on High-Impedance Surfaces (HIS) are proposed to be employed as a trasponder for Radio Frequency IDentification (RFID). The HIS comprises a Frequency Selective Surface (FSS) whose unit cell is formed by several concentric loop resonators. Every absorption peak of the reflection coefficient is associated to one of(More)