Complementary split ring resonator arrays for electromagnetic energy harvesting

Abstract

By virtue of their ability to resonate at a wavelength much larger than the maximum dimension, Split-Ring Resonator (SRR) cells can be densely stacked to create energy harvesting arrays having per-unit-area power efficiency higher than a single SRR cell. While the concept of using metamaterial particles for electromagnetic energy harvesting had been demonstrated in our earlier work, the overall efficiency of an SRR array in comparison to classical antenna arrays is fundamental to the viability of this technology. In this work, we focus on a comparative study based on numerical fullwave simulations where an array of SRRs is compared to an array of microstrip antennas. We show that an SRR array can provide significant enhancement in power efficiency and bandwidth in comparison to the classical microstrip patch antenna. Experimental validation is provided showing SRR arrays can provide significant energy-absorption enhancement.

Electromagnetic Power Harvester Using Wide-Angle and Polarization-Insensitive Metasurfaces

“…Note that we can flexibly change the working frequency band, matching the load value by changing the value of each parameter of the MS structure. When compared to the periodic dimension of the previous works, such as the SRR element, is about 1/4 operating wavelength at 5.8 GHz [7], and the G-CSRR element is about 1/3 operating wavelength at 5.55 GHz [13], and the WG-CSRR element is about 1/5 operating wavelength at 5.6 GHz [14], the proposed design in this paper is about 1/8 operating wavelength at 2.5 GHz, which is more miniaturization. Note that the proposed closed square-ring resonant ring rather than the split-ring form from existing literature is adopted in this paper.…”

“…Different from the electromagnetic metamaterial absorber [4][5][6], the small split-ring resonators (SRR) were first used to collect energy in 2012 [7]. After that, some other SRRs [8][9][10], electric-inductive-capacitive (ELC) resonators [11], and ground-backed complementary split-ring (G-CSRR) resonator have also been proposed for electromagnetic energy harvesting [12,13]. The recently reported wideband ground-backed complementary split-ring (WG-CSRR) resonator structure can improve the bandwidth [14].…”

Design of an effective energy receiving adapter for microwave wireless power transmission application

“…18,19 It has been shown that, in contrast with a single resonator, an array of resonators with close proximity of each other can enhance the power harvesting efficiency. 16 Furthermore, it has been shown that electrically small resonators in an array form provide wider frequency bandwidth in comparison with conventional antennas. 17 capture efficiency for the incident electromagnetic wave.…”

“…16 Furthermore, it has been shown that electrically small resonators in an array form provide wider frequency bandwidth in comparison with conventional antennas. 17 capture efficiency for the incident electromagnetic wave. 13,14 The capture efficiency as well as the AC-to-DC conversion efficiency of the receiving adapter is very important to the overall efficiency of the MPT system.…”

“…In a conventional rectifying antenna array, the dimension of the element is generally comparable to a half free-space wavelength and the spacing between elements should be large enough to avoid the destructive mutual coupling between array elements. Some new types of electrically small energy collectors have been introduced, such as the ground-backed complementary split ring resonators (G-SRRs), 15,16 the wideband G-SRRs based on bow-tie cavities, 17 and the face-to-face split ring resonators. 18,19 It has been shown that, in contrast with a single resonator, an array of resonators with close proximity of each other can enhance the power harvesting efficiency.…”