Electromagnetic Enhancement Effect And Application Of Active Electromagnetic Metamaterials

In recent years,electromagnetic metamaterials such as left-handed materials and near-zero refractive index materials have gradually entered the public eye.Their unique electromagnetic properties can be widely used in antenna satellites,radar detection,microwave and millimeter-wave circuit devices,military stealth and other fields.Therefore,it has become a research hotspot for experts and scholars.In the study of electromagnetic metamaterials,it can be found that electromagnetic waves often appear novel phenomena at the interface and internal propagation process of their media.These unique behaviors also provide new possibilities for the development of electromagnetic devices.In this paper,by adjusting the dielectric constant ε,permeability μ and wave impedance(?),and comparing with the characteristics of artificial electromagnetic metamaterials such as left-handed materials and near-zero refractive index materials,the propagation characteristics of electromagnetic waves on the surface and inside of near-zero real-part impedance active metamaterials(NZRPIM)are studied,and novel electromagnetic applications are proposed accordingly.Firstly,the abnormal reflection characteristics of electromagnetic wave on the surface of zero real impedance active metamaterial(ZRPIM)are discussed.By establishing the theoretical model of optical medium to optical dense medium(ZRPIM),based on Maxwell equations and Snell’s theorem,the full-angle total reflection and reflection increase of electromagnetic wave on the surface of zero real impedance active metamaterial are investigated.Then,a microwave amplification method and device based on the reflection enhancement of zero real impedance metamaterial surface are invented.Then a double-slab structure is proposed,in which one slab is made of near-zero real impedance active metamaterials,and the other slab is made of ordinary transparent materials.We prove that when the electromagnetic beam is incident on a double-layer slab structure,the transmission may be significantly enhanced due to the existence of cross-terms caused by the coherent superposition of forward and backward waves in a slab made of near-zero real impedance active metamaterials.Therefore,the corresponding transmitted wave may be strongly affected by the spacing between the two slabs or the refractive index of the existing fluid.This double-slab structure can be used to design and manufacture high-sensitivity and adjustable refractive index sensors.