Multi-Band Electromagnetic Metasurface Absorber Design Using Concentric Split-Ring Resonators

In this paper, we present a novel multi-band meta-surface absorber design for low-powered Internet of Things (IoT) devices. The absorber design is composed of concentric metallic split-ring resonators that collectively are able to absorb energy over multiple frequency bands, covering 2.5 GHz, 3.6 GHz, and 5 GHz bands. The metallic rings are etched from the top layer of the dielectric laminate and backed with a solid metallic ground layer. Based on the numerical simulation results, the electromagnetic harvester shows good performance, with absorption strength over 70% on average over the three bands and with an adequate performance as the angle of the incident is varied. The design can be fabricated using printed circuit board technology.