Impedance matching element

Abstract

An embodiment of the invention relates to an impedance matching element arranged between a first medium and a second medium. The impedance matching element is formed by stacking a plurality of metamaterial sheet layers along a direction perpendicular to the surfaces of the sheet layers. Each of the metamaterial sheet layers comprises a substrate and a plurality of artificial microstructures attached on the substrate. The substrate is divided into a plurality of lattices. The artificial microstructures are arranged in the lattices. Each of the lattices and the artificial microstructure in the lattice form a unit lattice. The impedance of the unit lattice of the impedance matching element is continuously changed along a sheet layer stacking direction. The impedance of each of the unit lattices forming a head sheet layer and a tail sheet layer is the same as the impedance of the corresponding position of the first medium or the second medium in contact with the head sheet layer and the tail sheet layer, respectively. According to the impedance matching element provided by the embodiment of the invention, an impedance gradient layer is formed by stacking a plurality of the metamaterial sheet layers, and the impedance matching element is arranged between two media and is capable of eliminating the impedance sudden change of the interface of the media, so that the problem of the energy loss of electromagnetic waves caused by the reflection of the electromagnetic waves in passing through the interface of two media.

Description

Technical field [0001] The present invention relates to the field of electromagnetic communication, and more specifically, to an impedance matching element made of metamaterials. Background technique [0002] With the continuous development of science and technology, electromagnetic wave technology has gradually penetrated into all aspects of our lives. An important characteristic of electromagnetic waves is that they can propagate in any medium or vacuum. In the process of electromagnetic waves propagating from the transmitting end to the receiving end, the loss of energy directly affects the distance of the electromagnetic signal and the quality of the transmitted signal. [0003] When electromagnetic waves pass through the same medium, there is basically no energy loss; when electromagnetic waves pass through the interface of different media, partial reflection occurs. Generally, the greater the difference between the electromagnetic parameters (dielectric constant or permeabi...

AI Technical Summary

Problems solved by technology

However, the current research on impedance matching in the process of electromagnetic wave transmission is still limited to circuits, and there is no relatively mature technology for impedance matching in space propagation.

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