Tuning absorption spectrum by tuning the value of the tangent losses in metamaterial

Abstract

This study provides analytical results for a very simple design for an electromagnetic wave absorber with a negative refractive index. It is only a copper disk separating from ground copper by FR4. This structure is simple design and very thin. This research can be used for scientific applications such as absorption, sensors, weather satellites, solar cells and to reduce the effects of electromagnetic waves. The design was implemented and simulated by CST program. This design provides a 99% absorption band. In addition, controlling the design dimensions of the disc and the thickness of the insulating layer leads to good results in tuning the resonant frequency. On the other hand, the results of the engineering dimension control of the design showed the possibility of obtaining an absorber with a wide absorption band that can be used in applications of energy harvesting and protection from the effects of electromagnetic waves. It is also worth noting that the design can be developed to work in a wide range of frequencies such as microwave, terahertz, up to optical frequencies, which may contribute to potential applications in many areas of optical and engineering technology.