Method for determining metamaterial unit structure having maximum bandwidth characteristic

Abstract

The invention provides a method for determining a metamaterial unit structure having a maximum bandwidth characteristic. The method comprises the steps of: defining a design variable, setting the initial value and threshold value of the design variable, calculating the fitness of the design variable, estimating the probability of passing individuals genetically to the next generation, and carrying out crossing, mutation, judgment and other operations to determine the metamaterial unit structure having the maximum bandwidth characteristic. The method provided in the invention makes use of an improved genetic algorithm to conduct optimization selection on the initial value and conducts dynamic change on mutation probability, thus improving convergence of optimization methods and better obtaining a globally optimal solution. Thus, a locally optimal solution is avoided.

Description

technical field [0001] The invention relates to the field of metamaterials, in particular to a method for optimizing the structure of a metamaterial unit by using a genetic algorithm. Background technique [0002] At present, the patch-type metamaterial unit usually prints a metal configuration with a specific structure on a dielectric substrate. When an electromagnetic wave is incident, the metal configuration will undergo electrical resonance and magnetic resonance respectively. Near the resonant frequency, the metal configuration The equal permittivity and equivalent magnetic permeability can be shown as negative values. When the frequency of exciting electric resonance and magnetic resonance coincides, the entire metamaterial unit structure will show negative refraction properties. [0003] When determining the unit structure of patch-type metamaterials, the idea of ​​topology optimization is usually used for reference. The two sides of the dielectric substrate can be s...

AI Technical Summary

Problems solved by technology

However, the convergence of the gradient optimization method greatly depends on the selection of initial values, and it is often difficult to provide a suitable initial configuration

Moreover, the convergence of existing optimization methods is low, and there are many local optimal solutions, so it is difficult to design the structure of metamaterials through existing optimization methods

[0004] Therefore, it is necessary to provide a method to determine the structure of the metamaterial unit with the maximum bandwidth characteristics, so as to solve the problems of low convergence and local optimal solution existing in the prior art

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