Abstract
Optically Transparent Microwave Metamaterial Absorber (OTMMA) is of significant use in both civil and military field. In this paper, equivalent circuit model is adopted as springboard to navigate the design of OTMMA. The physical model and absorption mechanisms of ideal lightweight ultrathin OTMMA are comprehensively researched. Both the theoretical value of equivalent resistance and the quantitative relation between the equivalent inductance and equivalent capacitance are derived for design. Frequency-dependent characteristics of theoretical equivalent resistance are also investigated. Based on these theoretical works, an effective and controllable design approach is proposed. To validate the approach, a wideband OTMMA is designed, fabricated, analyzed and tested. The results reveal that high absorption more than 90% can be achieved in the whole 6~18 GHz band. The fabricated OTMMA also has an optical transparency up to 78% at 600 nm and is much thinner and lighter than its counterparts.
Highlights
Transparent microwave absorbers are a kind of absorbers that can absorb the microwave energy and transmit the visible light
It is seen that the proposed Optically Transparent Microwave Metamaterial Absorber (OTMMA) has perfect absorption performance better than 90% in the whole range of 6–18 GHz
An equivalent circuit model is adopted as springboard to navigate the design of OTMMA
Summary
Transparent microwave absorbers are a kind of absorbers that can absorb the microwave energy and transmit the visible light. Traditional optically transparent microwave absorbers reported in references are in the form of the Salisbury screen or Jaumann screen They all have deficiencies such as narrow absorption band or thicker structures [3,4,5,6]. Recent research works have reported many novel structure designs and analyzed the fantastic electromagnetic responses of their designs, which contributed valuable highlights to the development of metamaterial microwave absorbers. The characteristics of equivalent resistance varied with the absorption frequency are explored Based on these theoretical studies, we propose an effective approach to designing the OTMMAs with two controllable absorption peaks or a broad bandwidth for applications on stealth of the metal target. In order to validate the theoretical study, an ultrathin lightweight OTMMA operating in a 6–18 GHz band was designed, fabricated, tested and discussed
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