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Abstract
This paper presents a three-dimensional structure of metamaterial absorber, and the unit of the absorber is composed of six different size resistive films which are placed on the metal plane ground. The simulated results show that the absorber can realize ultra-broadband absorption, which is from 38 to 142 GHz when the absorption is larger than 90%. And the relative absorption bandwidth can achieve 115.5%. In addition, the proposed metamaterial absorber is polarization-insensitive, which has the same absorption spectra for TE and TM polarization waves. And the absorber has large incident and polarization angles. In the end, the power loss density is analyzed. Through observing the distribution of power loss density, a polarization-controlled metamaterial absorber can be implemented if subtract the resistance film of the horizontal direction or the vertical direction subtracted. And the polarization-controlled metamaterial absorber also has ultra-broadband absorption effect. We believe that the absorber will have many potential applications.