A Negative Magnetic Permeability Metamaterial and MRI Magnetic Signal Enhancement Device

Abstract

The invention relates to a negative magnetic permeability metamaterial and an MRI magnetic signal enhancement device. The negative magnetic permeability metamaterial includes a substrate and a plurality of first artificial microstructures and second artificial microstructures arranged in periodic arrays on both sides of the substrate. , the first artificial microstructure and the second artificial microstructure are connected through a metal via, the first artificial microstructure and the second artificial microstructure are covered with a protective layer, and the first artificial microstructure and the second artificial microstructure are a square Spiral ring. The resonant frequency of the metamaterial can be greatly reduced by adopting the present invention. In addition, since the artificial microstructure in the metamaterial is a magnetic microstructure, by designing the frequency of the magnetic microstructure under the condition of negative magnetic permeability to be the same as the working frequency of the MRI imaging device, It can enhance the magnetic signal received by the receiving coil, thereby enhancing the imaging effect, and making an MRI magnetic signal enhancement device is of great significance to the development of the metamaterial industry.

Description

technical field [0001] The invention relates to the field of metamaterials, in particular to a negative magnetic permeability metamaterial MRI magnetic signal enhancement device. Background technique [0002] At present, there have been a lot of research on magnetic permeability in the international community, among which the research on positive magnetic permeability has become mature, and the research on negative magnetic permeability metamaterials is now a hot research topic at home and abroad. Negative magnetic permeability has Quantum polarization can polarize incident waves, so it has a wide range of effects, such as magnetic resonance imaging in the field of medical imaging. Negative magnetic permeability materials can enhance the imaging effect of electromagnetic waves. In addition, negative magnetic permeability materials It also plays an important role in lens research. In the field of engineering, magnetic permeability usually refers to relative magnetic permeabil...

AI Technical Summary

Problems solved by technology

At present, the geometric shape of the existing artificial microstructure is "I" shape or such as figure 1 The opening ring similar to the "concave" shape is shown, but none of these structures can achieve a magnetic permeability μ significantly less than 0 or significantly reduce the resonant frequency of the metamaterial. Only by designing an artificial microstructure with a special geometric figure can the artificial Electromagnetic materials achieve a magnetic permeability μ value far less than 0 in a specific frequency band, and have a lower resonance frequency

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