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Numerical Research on Tunable Metamaterial Absorber

Author: HuChangShou
Tutor: LiuLingYun
School: Hubei University of Technology
Course: Motor and electrical
Keywords: Permittivity Permeability Metamaterials Electric resonance
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 259
Quote: 0
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Abstract


In order to improve the ability of the equipment to survive and penetration , the world launched a stealth technology . Absorbing materials have also been widely applied to the civil aspects of the information dissemination , electromagnetic shielding , microwave radiation protection . Therefore has important practical value to study emerging the absorbing properties . Metamaterial absorbing physical characteristics to effectively reduce the reflection of electromagnetic waves can be used in stealth technology and microwave darkroom thus wide attention and research . In this paper , on the basis of computer simulation technology and has radar absorbing metamaterials research results , the design of two different types of metamaterial structure , the the ring high Absorbing rates metamaterial absorber and suck wave band tunable metamaterial absorber . In this paper, the transfer matrix theory to study the transmission characteristics of metamaterials through a numerical simulation study , the extraction of a finite thickness metamaterials transmission parameters and reflection parameters , calculate the radar absorbing rate . At the same time , research metamaterial absorber structure in the frequency band of microwave absorbing performance, using numerical simulation techniques to study the changes of the various parameters of the metamaterial absorber absorbing properties in the microwave frequency range . The main conclusions include : 1 monolayer ring metamaterial absorber reaches the absorption peak at 10.2GHz Department , radar absorbing 91.3 % . The multilayer combination Absorber at 9.72GHz at peak microwave absorbing rate of close to 100 % . Simulation shows the ERR ( ring resonator ) also has electric resonance , not only proved by opening closed ERR ERR electric resonance , magnetic resonance metamaterials also destroyed , which indicates that the ERR electrical resonance with short wire The resonant consistent . In the structure of the combination of magnetic resonance formed by the ERR and short wire anti-parallel current drive generated . The electrical resonant mainly by the electrical response of the ERR edge effects, and short wires of the surface currents generated, and the opening size and major impact on the electrical resonance ERR . ERR opening size or the regulation of substrate electromagnetic parameters can achieve the radar absorbing band adjustment , adjusting the parameters of the substrate can be more obvious -control radar absorbing band .

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