Dual Band Metasurface Integrated With Wideband Power Combiner for RF Energy Harvesting

• Published in: IEEE microwave and wireless technology letters (Print) Vol. 33; no. 9; pp. 1 - 4
• Main Authors: Kumar, R. Aneesh, Saha, Chinmoy, Sethunadh, R.
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.09.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Broadband; Chebyshev approximation; Chebyshev transformer; Dual band; electric-inductive capacitive; Energy harvesting; Impedance; Input impedance; metasurface (MS); Metasurfaces; Power combiners; single square loop (SSL); Transformers; Unit cell; Wideband
• ISSN: 2771-957X; 2771-9588
• DOI: 10.1109/LMWT.2023.3284396

This letter presents a novel dual-band metasurface (MS) structure with a Chebyshev transformer-based wideband power combiner for RF energy harvesting (RFEH). The unit cell (UC) of MS formed by embedding an electric-inductive capacitive resonator (EICR) in a single square loop (SSL) provides dual-band characteristics at 2.2 and 4.6 GHz, respectively. The wideband power combiner in corporate feed architecture, represented by the circuit schematic, channels the power to a 50-<inline-formula> <tex-math notation="LaTeX">\Omega</tex-math> </inline-formula> load, mimicking the input impedance of any standard rectifier. The system is studied using numerical simulation followed by fabrication of the prototype and its validation with experiment. The proposed system provides close to 90% radiation to ac conversion efficiency at 50-<inline-formula> <tex-math notation="LaTeX">\Omega</tex-math> </inline-formula> load in dual-band.