Design of an ultra-wideband omnidirectional and polarization insensitive flower petal antenna for potential ambient electromagnetic energy harvesting applications

Abstract

Developing a polarization insensitive, omnidirectional, and ultra-wideband (UWB) antenna is highly desired for improving the utilization of freely available electromagnetic (EM) radiation energy. In this study, we have designed an UWB antenna based on tapered flower petals and numerically analyzed to show that it is a promising candidate for energy harvesting applications in the infrared (IR) to UV–visible regime. The impacts of design strategy and parameters on the absorption performance are studied numerically. The antenna shows a high performance in both bandwidth and absorptivity (average absorption of 84.5% spanning a broad range from 25 to 800 THz) under normal incidence of plane waves. To get a better understanding behind such high and UWB absorption mechanism, we investigated the electric field (E-field) distribution over the structure. The antenna also generates less than 5% absorption deviation between normal to 45° incident angle and 0.05% absorption deviation between 0° and 90° polarizations for both transverse electric (TE) and transverse magnetic (TM) modes. This new design aspect and the numerical findings unfolds the new direction for numerous EM wideband applications such as THz technology, photo detection, bolometric sensing, camouflaging, spectral imaging, and ambient EM energy harvesting applications.

Advances in Smart Photovoltaic Textiles

“…Electromagnetic radiation may be scavenged by antennas and coils, which has recently shown substantial potential as an alternative energy source, (Figure f) . This technology is capable of harnessing and transforming electromagnetic energy into electrical energy. , A wearable energy harvesting device, for example, has recently been developed with MXene (Ti 3 C 2 Tx) 5G antenna technology. The device serves as a remote and battery-less power source, allowing constant monitoring and data transfer.…”

An elliptical nanoantenna array plasmonic metasurface for efficient solar energy harvesting

“…A(ω) = 1 − T (ω) − R(ω), where T, R, and ω, respectively, stand for transmission, reflection, and frequency, can be used to express the total absorption. The scattering parameters (S-parameters) and absorption (A) can also be connected using 78 In this scenario, the concepts of reflection and transmission are associated with the reflection coefficient (R(ω) = |S 11 (ω)| 2 ) and transmission coefficient (T (ω) = |S 21 (ω)| 2 ) of the S-parameters. 78 Fig.…”

“…The scattering parameters (S-parameters) and absorption (A) can also be connected using 78 In this scenario, the concepts of reflection and transmission are associated with the reflection coefficient (R(ω) = |S 11 (ω)| 2 ) and transmission coefficient (T (ω) = |S 21 (ω)| 2 ) of the S-parameters. 78 Fig. 7a-d illustrates the normalized impedance and effective parameters of the proposed nanostructure.…”

“…Therefore, the absorption can only be calculated using the S 11 parameter, and the absorption equation can be redefined as A = 1 − |S 11 | 2 . According to the impedance theory method, the relationship between reflectivity and the impedance of a medium at an interface is described by the following equation: 5,78…”

Ultrathin Broadband Metasurface Superabsorbers from a van der Waals Semimetal

“…Moreover, plasmonic responses tend to be narrowband [6,26] and do not absorb off-resonance light. The polarization dependence can be significantly reduced by patterning elaborate nanoantenna structures, [27,28] and broadband absorption can be achieved by resonance multiplexing [6,16,29,30] or by incorporating epsilon-near-zero materials in the dielectric spacer. [31] However, achieving polarization independent broadband absorption in purely plasmonic absorbers requires intricate geometries that make design and fabrication challenging.…”