A design of a compatible multispectral metamaterial absorber with broadband and strong absorption in the microwave, visible‐light, and near‐infrared bands is presented based on conductive carbon black (CCB)‐filled polyethylene (PE) composite films. The CCB‐filled PE composite films are employed to not only attenuate the light energy for realizing visible and near‐infrared absorbers, but also provide a conductive film to construct resistive metamaterial surfaces for realizing a microwave absorber. Considering the two natural properties of the composite films, light attenuation property and electric property, a multilayered structure based on resistive metamaterial surfaces is designed to realize a broadband compatible absorber. These resistive metamaterial surface layers are realized by the prepared composite films. The effect of different resistances of resistive metamaterial surfaces, polarization, and incident angles on the microwave absorbing performance is also analyzed in detail. Finally, a compatible multispectral absorber with a total thickness of 17 mm (0.133λmax) is fabricated and measured. Simulated and measured results both show that the presented absorber can achieve an absorption of 96.8% over a frequency range from 2.35 to 18 GHz. On the other hand, a high absorption of about 95% is obtained in visible‐light and near‐infrared bands as well.
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.
In this paper, the optically transparent microstrip antenna made of transparent ITO (Indium Tin Oxide) films is investigated. The present transparent microstrip antenna comprises a thin sheet of quartz glass substrate with two conductive ITO film coatings and is fed through a coaxial probe. As an example, an X-band transparent microstrip antenna is designed, fabricated and measured. To discuss the effect of electromagnetic leakage of ITO film on the radiation efficiency, two rectangle cavity resonators with same dimensions are analyzed. The boundary conditions of the two resonators are the same except the top layers of one is copper while the other is ITO film with sheet resistance of 3/sq.
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