Tri-band miniaturized wide-angle and polarization-insensitive metasurface for ambient energy harvesting

Abstract

In this paper, a tri-band miniaturized wide-angle and polarization-insensitive metasurface is proposed as an ambient energy collector. The metasurface is composed of a subwavelength butterfly-type closed-ring (BCR) array attached to a low-loss substrate with a metallic ground. Each unit cell of the energy harvesting metasurface has only one harvesting port. Its energy harvesting efficiency for different polarization and incident angles was analyzed, and the results show that the maximum harvesting efficiency is 90%, 83%, and 81% at the three frequency bands of 0.9 GHz, 2.6 GHz, and 5.7 GHz, respectively. Moreover, a prototype of the 7 × 7 BCR metasurface harvesting array was fabricated and measured. The experimental results validate that the proposed metasurface performs well under transverse electric and transverse magnetic polarization and is suitable for wide-angle incident energy harvesting in the three frequency bands.

Multiresonant Split Ring Resonator with Meandered Strips

“…[15][16][17][18][19] This second solution was often involved in producing multiband operation but a bandwidth broadening for a metamaterial-inspired antenna was shown as well. [17] Fractal-inspired cells were also considered for both a multiband operation [20] and a bandwidth enhancement [21,22] with application dedicated to ambient EM energy harvesting, nanoantenna, and EM wave absorbing, respectively. Other characteristic requirements can be achieved by such fractal structures, and a labyrinth metasurface showed a good angular robustness of the filtering behavior under oblique incidence.…”

Low-Cost Air Gap Metasurface Structure for High Absorption Efficiency Energy Harvesting

“…A ground backed complementary split ring resonator (G-CSRR) was realized on a 1.524 mm thick Rogers RT Duroid 5880 dielectric (ε R � 2.2, tanδ � 0.001) with a unit-cell maximum efficiency of 83% [7]. In [10], a butterflytype closed loop element was implemented on an F4B substrate (ε R � 2.65, tanδ � 0.001) of 4 mm thickness with a peak efficiency of 81%. Polarization insensitive structures were also developed with four rotated elements and multiple channeling vias [11][12][13] or opportunely placing a single channeling via [14,15].…”

Three-Dimensional Resistive Metamaterial Absorber Loaded with Metallic Resonators for the Enhancement of Lower-Frequency Absorption

“…The strong resonance from the metallic metamaterial and the loss from the dielectric substrate worked together contributing to nearly perfect absorption at one frequency. Based on this, various MAs with one-, two-or multi-band absorption were proposed [8][9][10][11][12][13]. However, the highly effective absorption always accompanies with the narrow bandwidth, which was the fundamental obstacle limited the practical application.…”