Metamaterial radome based on frequency triggering mechanism

Abstract

The invention provides a metamaterial radome based on the frequency triggering mechanism, aims to improve the transmission rate of the radome under the premise of ensuring the physical strength of theradome, improves electromagnetic protection flexibility and widens the transmission band. The metamaterial radome comprises a radome supporting layer and a multi-layer super-surface structure, wherein the radome support layer 1 is a cover made of a dielectric flat plate or a dielectric housing material and is used for ensuring the physical strength and mechanical loading of the radome, the multi-layer super-surface structure adopts a laminated structure composed of at least two first dielectric substrates and a second dielectric substrate sandwiched between the adjacent first dielectric substrates, two sides of the first dielectric substrate are respectively printed with at least three uniformly-arranged annular metal patches for realizing frequency triggering characteristics of the radome, and the dielectric constant of the first dielectric substrate is greater than the dielectric constant of the second dielectric substrate.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a metamaterial radome, in particular to a metamaterial radome based on a frequency trigger mechanism, which can be used in the field of electromagnetic protection. technical background [0002] As a new type of artificial electromagnetic material, metamaterials have a strong frequency trigger mechanism and electromagnetic wave regulation ability, and can meet the multiple requirements of broadband and large-angle wave transmission design and electromagnetic shielding design. The frequency trigger mechanism of metamaterials means that when an electromagnetic wave of a specific frequency is incident on the metamaterial, the resonant ring structure on the surface of the metamaterial will resonate, so that the electromagnetic wave incident on the surface of the metamaterial will be reflected or transmitted. [0003] Typically, antenna systems are provided with a radome, which is a cov...

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Problems solved by technology

The radome can effectively ensure the normal operation of the antenna and the entire microwave system. It has wind and sand resistance, high temperature resistance, and good mechanical bearing capacity. For example, in 2012, Zhang Jin wrote a master thesis titled "Structural Analysis of Large Radome" , introduces different radome structures, which can be divided into uniform single layer, A-type interlayer, B-type interlayer, C-type interlayer, multi-layer structure, artificial medium containing metal objects and space skeleton structure according to the cross-sectional form; according to the interlayer material and It is divided into foam interlayer and honeycomb interlayer structure; the main function of the above-mentioned radome structure is to protect the antenna system from the influence of harsh environments and realize simple wave transmission, but its defect is that it does not have electromagnetic protection capabilities

[0004] In order to achieve electromagnetic protection, a metamaterial radome based on frequency triggering characteristics has been proposed. For example, the application publication number is CN102760965 A, and the patent application titled "Large-angle wave-transmitting metamaterial and its radome and antenna system" discloses a The large-angle wave-transparent metamaterial radome includes multiple metamaterial sheets, each metamaterial sheet includes a substrate and a plurality of artificial microstructures of the same shape and size arrayed on the substrate, between adjacent layers The shape of the artificial microstructure is different, and it can achieve large-angle wave transmission in the 19-22GHz frequency band, and in the case of large-angle incidence, the loss is relatively stable, it can maintain a high wave transmission rate, and shield electromagnetic waves in other frequency bands; but The defect of the above technology is that on the one hand, the electromagnetic protection is not aimed at the frequency band where the electromagnetic interference is located, but directly shields the electromagnetic waves of all frequency bands except the wave-transparent frequency band, resulting in inflexible electromagnetic protection; on the other hand, the wave-transparent frequency band of the radome is relatively Narrow, the radome needs to be replaced under different frequency band requirements; finally, the mechanical load capacity of the radome constructed simply by using the metamaterial structure is often not enough, and the uniform single-layer, A-type interlayer, B-type interlayer, C-type interlayer, multi-layer structure , the artificial medium containing metal objects and the radome design of the space frame structure do not have the frequency selective design of electromagnetic wave penetration and electromagnetic protection

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