Abstract

In this paper, a typical “sandwich” disk-resistive film ultra-broadband Metamaterial Absorber (MA) is designed. The MA has a bandwidth of 17.2 Ghz, the top layer consists of nine disk-shaped resistance films, the dielectric layer is FR-4, and the bottom is all-loss-metal Al. The geometry parameters of unit cell is optimized using full finite-integral method and the simulation is done by CST2015 Microwave Studio software. The simulation shows that the average absorption both of TE and TM wave is greater than 90% from 22.6Ghz to 43.4Ghz. The results also show that the MA is insensitive to polarization. The absorption is more than 90% from 26.992Ghz to 42.6Ghz when the incident angle is from 0° to 45°. In addition, we also numerically studied the wave absorption with different thickness of dielectric layer, we found that when the thickness is 1 mm, the MA has the best absorption characteristics. Finally, the surface current distribution with a peak value of 27.3 Ghz is given, and shows that there is significant magnetic resonance inside the particle.

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