Method for constructing constitutive parameters of metamaterial based on transformation optics

Abstract

The invention provides a method for constructing constitutive parameters of a metamaterial based on the transformation optics. The metamaterial is used for preparing an OAM (Orbital Angular Momentum)beam generator. The constitutive parameters of the metamaterial comprise constitutive parameters of a transformation cylinder. The transformation cylinder is used for transforming a plane beam into avortex beam with a topological charge. The method for constructing the constitutive parameters of the metamaterial based on the transformation optics comprises the steps of obtaining a proportionalitycoefficient of the topological charge according to the vortex beam with the specific topological charge; determining a first functional relation between a plane wavefront and a target vortex wavefront by using a method of the transformation optics based on the proportionality coefficient; and substituting the first functional relation into a first formula, and substituting an obtained result intoa second formula to obtain the constitutive parameters of the transformation cylinder. According to the method, the transformation cylinder constitutive parameters of the metamaterial used for preparing the transformation cylinder can be accurately constructed according to the topological charge of the vortex beam to be formed based on the principle of the transformation optics.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for constructing constitutive parameters of metamaterials based on transformation optics. Background technique [0002] In the prior art, people often use a plurality of different antennas to transmit one kind of information at the same time, which can reduce the influence of channel fading and further improve the reliability of the communication system. Electromagnetic waves not only have energy, but also have orbital angular momentum (OAM). OAM is the basic physical characteristic of electromagnetic waves, reflecting the phase change parameters of electromagnetic waves around the azimuth direction of the propagation direction axis. For electromagnetic waves of any frequency, all OAM beams constitute a set of mutually orthogonal and infinitely many eigenmodes. OAM communication is to use the topological charge (value l) of the OAM mode, a group of electr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for constructing the constitutive parameters of metamaterials based on transformation optics, aiming to solve the problem of the accuracy of the constitutive parameters of the transformation cylinder constructed according to the topological charge of the vortex beam to be formed in the prior art low problem

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