Abstract-In this paper, the applications of chiral layers and metamaterials as radar absorbing materials are investigated. A perfect electric conductor plate covered by a chiral metamaterial is considered and after the formulation of the problem, reflection of the structure under an oblique plane wave incidence of arbitrary polarization is investigated. Then several examples of the applications of chiral layers in nondispersive, dispersive, and chiral nihility conditions are provided to design of zero reflection coatings. Finally, application of chiral metamaterial structures as microwave absorbers is discussed. In some of the provided examples, the method of genetic algorithm is used to optimize chiral coatings for the minimization of co-and cross reflected power.
In this article a new method for creating mixer component in infrared and THz is suggested. Since the nonlinear property of admittance creates frequency components that do not exist in the input signal and the electrical conductivity is associated with admittance, in our work we have proven and simulated that the nonlinear property of graphene admittance can produce mixer component. The simulation results show that the mixer component is larger than other components, therefore the mixer works properly. Because of nano scale of graphene structure, this method paves the road to achieve super compact circuits.
Combining traveling-wave ring resonators and microstrip inductors in a planar microstrip line circuit, negative values of electric permittivity and magnetic permeability can be obtained. This phenomenon arises from negative permeability of the traveling-wave ring resonators and negative permittivity due to the behavior of shorted stubs within the rejected frequency band. Thanks to the nonreciprocal behavior of the travelingwave ring resonators we can achieve 16 dB isolation between s21 and s12 in the left-handed region. Therefore, a novel approach is presented here to synthesize a nonreciprocal magnetless lefthanded media in microstrip technology. Full wave simulation results confirm the left-handed behavior of the interaction. The concept can be extended to active nonreciprocal network.
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