Metamaterial electromagnetic energy harvester with high selective harvesting for left- and right-handed circularly polarized waves

Abstract

In this paper, a metamaterial electromagnetic energy harvester constructed via the capacitive loading of metal circular split rings is presented. Each energy-harvesting cell is loaded with a resistance that imitates the input impedance of a rectifier circuit. Specifically, the metamaterial energy harvester has high selective harvesting for left- and right-handed circularly polarized waves. Here, the energy absorption is mostly induced by the resistive load; thus, effective energy harvesting can be achieved. Moreover, the proposed energy harvester exhibits a high-efficiency harvesting for right-handed circularly polarized waves over a wide range of incident angles. Further, a transmission line model is adopted to interpret the energy harvesting mechanism, which shows that a good impedance matching and low dielectric loss can further enhance the harvesting efficiency. To demonstrate the design, a 15 × 15 unit-cell prototype is fabricated and measured, and the measured results reasonably agree with the simulated ones.

Metamaterials‐Based Photoelectric Conversion: From Microwave to Optical Range

“…[157] A metallic split ring with a capacitive load in the gap was designed, which can selectively harvest right-handed cir-cularly polarized (RCP) wave, while the harvesting of left-handed circularly polarized (LCP) wave is suppressed. [158] Such diversity feature makes the MEHs more versatile and effective in the complex environments, which are summarized in Table 1. Evidently, some of these MEHs are designed with more than one via, which is in favor of energy collection, but brings challenges to fabrication and application.…”

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

“…The open-ended surface currents distribution that was generated by various incident waves from the split-ring resonant lead to single-port collection with angle and polarization sensitive performance on a split-ring structure. So, the proposed square-ring MS structure can harvesting wide-angle, polarization-insensitive incident waves by optimizing the position of the harvesting point, and maintain high efficiency when compared to the structure described in the reference [6,[10][11][12] only collects single-polarized incident waves. By changing the value of each parameter of the MS structure (L, W, P, ε r , t), we can flexibly change the working frequency band, matching the load (R) value, to achieve the performance of effective energy harvesting.…”

“…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].…”

An Ultra‐Broadband Chirality Selective Metastructure Absorber using High Impedance Surface

“…Shang et al designed a capacitor loaded in a circular open ring to achieve complete absorption of RCPW and complete reflection of LCPW. [25] The chirality selective metastructure absorber (CSMA) is used to select the direction of reflection. However, those CSMAs are realized either by drilling holes in the dielectric plate or by loading electronic components, which not only increases the processing difficulty but also is not easy to apply in higher frequency bands (THz, [26,27] IR, [28] and optical visible spectral ranges [29] ).…”