Tunable microwave material with negative refractive index

Abstract

A material with a tunable negative refraction index belongs to the technique field of microwave materials. The material is formed by periodically stacking a sheeting-shaped isolation-typed ferrimagnetic material with an equivalent negative permeability and a sheeting-shaped material with an equivalent negative specific inductive capacity; the sheeting-shaped isolation-typed ferrimagnetic material is a ferrite garnet ferrimagnetic material with the specific inductive capacity being 13.8, the saturation intensity being 1830 Gs, the loss tangent being 0.0004, and the thickness being 1mm to 2mm; the sheeting-shaped material with the equivalent negative specific inductive capacity is a metal array formed by parallel metal lines sedimentated on a polytetrafluoroethylene glass fiber circuit substrate with the thickness being 0.254mm to 0.508mm; and for each metal line, the thickness is 0.018mm to 0.035mm, the width is 0.2mm, and the interval among the metal lines is 1.508mm to 2 mm. The material with the negative refraction index has wide operating frequency; the frequency band realizing negative refraction index can change along with the change of externally-applied magnetic field. The material with the tunable refraction index has wide application foreground in the fields such as stealth materials, antenna works, microwave devices and millimeter wave devices.

Description

Technical field [0001] A tunable microwave negative refractive index material belongs to the technical field of microwave materials. Background technique [0002] The real part of the dielectric constant and permeability of natural substances in nature are non-negative at the same time in the entire electromagnetic spectrum, and the real part of the refractive index is positive. So far, natural materials with negative dielectric constant and magnetic permeability have not been found in nature. Before 1967, the Soviet scientist Veselago theoretically analyzed the electrokinetic theory behavior of electromagnetic waves in an isotropic homogeneous medium where the hypothetical permittivity and magnetic permeability were negative at the same time, and predicted that the interaction between electromagnetic waves and this hypothetical material would produce extraordinary Special transmission / refraction / reflection characteristics. In this imaginary material, the phase velocity of the el...

AI Technical Summary

Problems solved by technology

However, there are still great difficulties in realizing the frequency tunability of negative refractive index media.

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