Design of a perfect and multi-resonant metamaterial absorber for electromagnetic energy harvesting applications

Abstract

In this work, a perfect absorber based on a split ring resonator structure is proposed and numerically analyzed. The software CST STUDIO was employed to carry out the numerical analysis and the optimization of the proposed structure. The electromagnetic properties of the proposed metamaterial cell were analyzed in the first phase of this study demonstrating that such structure resonates at 2.4 GHz and 4.2 GHz simultaneously. In fact, this structure has negative permittivity and permeability in these two bands. The optimization process has led us to obtain a compact resonator, which has a total size of 15 mm × 15 mm. Subsequently, the capacity of this structure as an absorber of electromagnetic energy is analyzed. The obtained results reveal that this structure has absorption efficiencies of 98.2% and 99.7% for the first and second bands respectively. Also, other characteristic parameters were evaluated. This shows that the proposed structure has a high electrical performance and can be used for the collection of electromagnetic energy, which can be used to power wireless sensor networks.

Design and Implementation of a 2.4-GHz Fully Integrated Butler Matrix for Smart Antenna System

“…As a result, the authors reported an antenna with a bandwidth of 415 MHz. On the other hand, due to their peculiar electromagnetic properties, such as negative permittivity and permeability, metamaterial structures have attracted the curiosity of researchers throughout the last two decades [18]- [21], [30]- [33]. In fact, the radiation pattern or the gain of antennas can be manipulated by incorporating metamaterial cells in the vicinity of the radiating part or etched into the substrate [22]- [24].…”