Bendable Mn _x Ca _(0.90−x) Ni _0.10 Fe ₂ O ₄ substrate-based symmetrical metamaterial absorber for RF energy harvesting application to achieve sustainable development goals

This article presents a bendable substrate MnxCa(0.90−x)Ni0.10Fe2O4 based metamaterial absorber for RF energy harvestingfrom Wi-Fi frequency of 5 GHz to the achievement of the Sustainable Development Goals. The bendable metamaterial absorber (BMMA) energy harvester unit cell constructed with the physical dimension of 21 × 21 mm2. The proposed unit cell consist of cross sign shaped resonator surrounded by circular ring resonator is located middle portion and boundary split outer ring resonator. Based on the simulation findings, the proposed BMMA energy harvester provides maximum absorption efficiency of 99.42% at 5 GHz. Due to the axis symmetrical design, the energy harvester unit cell shows an excellent angle insensitive up to 90 degrees for polarization angle and up to 45 degrees for incident angle, for both TE and TM modes. The proposed BMMA exhibits single negative properties, and it shows excellent absorption efficiency under convex bending conditions. The lightweight, flexibility of the structure indicate that MnxCa(0.90−x)Ni0.10Fe2O4 based bendable metamaterial absorber energy harvester have significant potential for RF energy harvesting application from Wi-Fi frequency of 5 GHz and it achieve Sustainable Development Goals (SDGs), specially alignment with SDG 7 (Affordable and Clean Energy), SDG 9, SDG 11, and SDG 13.