Metamaterials are a new class of ordered composites that exhibit exceptional electromagnetic properties not readily observed in nature. In particular, artificial materials with both negative permittivity and permeability have attracted widespread interest in recent years. These composites are constructed from an array of metallic in dielectric and magnetic substrates and exhibit unusual electro...

In this paper, BaLa‌xGdxFe12-2xO19 (x=0.2, 0.4, 0.6 and 0.8) were synthesized via sol-gel auto-combustion method. Fourier transform infrared spectroscopy (FTIR) of samples was represented that the bands at 400 and 500 cm-1 were related to the formation of hexaferrite phase. The (x-ray diffraction) XRD patterns were matched exactly with the structure of barium hexaferrite. (Field emission scanni...

We demonstrate that the ratio of group to phase velocity has a simple relationship to the orientation of the electromagnetic field. In nondispersive materials, opposite group and phase velocity corresponds to fields that are mostly oriented in the propagation direction. More generally, this relationship (including the case of dispersive and negative-index materials) offers a perspective on the ...

The 4th Prof. Vijaya Agarwala Memorial National Symposium on Microwave Absorbing Materials (VAMMAM-2020)” was held during 23 - 24th, August 2020 at Indian Institute of Technology Roorkee in association with Centre Nanotechnology and Common Research Development Hub (CRTDH) for New Materials/Stealth Applications Department Applied Mechanics Motilal Nehru Allahabad, Prayagraj, India.

In this paper, reduced graphene oxide functionalized with cobalt ferrite nanocomposites (CoFe@rGO) as a novel type of electromagnetic wave (EW) absorbing materials was successfully prepared by a three-step chemical method including hydrothermal synthesis, annealing process and mixing with paraffin. The effect of the sample thickness and the amount of paraffin on the EW absorption properties of ...

Abstract Multilayer gradient absorbing materials are difficult to be modeled and simulated in practical applications. To solve this problem, a method of the inversion equivalent electromagnetic parameters multilayer based on annealing algorithm is proposed paper. The reflectivity material different forms polarization obliquely incident at angles calculated, then used calculate incidence angle s...

This paper presents a general and systematic analysis of the problem of electromagnetic scattering by an arbitrary finite fixed object embedded in an absorbing, homogeneous, isotropic, and unbounded medium. The volume integral equation is used to derive generalized formulas of the far-field approximation. The latter serve to introduce direct optical observables such as the phase and extinction ...

In this study, a new closed-form expression is developed to determine the equivalent electromagnetic parameters (permittivity and permeability) of biaxial anisotropic honeycomb radar-absorbing materials (RAMs). Based on medium theory, nonmagnetic substrate absorbing coating structure are one kind material, then, effective properties irregular hexagonal (compressed or stretched) honeycombs obtai...