Abstract A simple design of a broadband multifunctional polarization converter using an anisotropic metasurface for X-band application is proposed. The proposed consists periodic array the two-corner-cut square patch resonators based on FR-4 substrate that achieves both cross-polarization and linear-to-circular conversions. simulated results show displays linear conversion in frequency range from 8 to 12 GHz with efficiency above 90%. kept higher than 80% wide incident angle up 45°....

Abstract An efficient resolution for ultrathin metamaterial perfect absorber (MPA) is proposed and demonstrated in the VHF radio band (30–300 MHz). By adjusting lumped capacitors through vertical interconnects, miniaturized to be only λ/816 λ/84 its thickness periodicity with respect operating wavelength (at 102 MHz), respectively. The detailed simulation calculation show that MPA can maintain an absorption rate over 90% a certain range of incident angle wide variation capacitance....

Abstract In this paper, a broadband metamaterial microwave absorber is designed, simulated and measured. Differently from the traditional method which only based on unit cell boundary conditions, we carried out full-wave finite integration simulations using full-sized configurations. Starting an elementary structure, four kinds of coding blocks, 2 × 2, 3 3, 4 6 blocks were optimized then used as building (meta-block) for construction numerous 12 topologies with realistic size scale. We found...

Abstract In this article, we investigated the efficiency of a magnetic resonant wireless power transfer (MR-WPT) in conducting medium and found out an optimal frequency for designing system. environment, eddy current loss is generated by high-frequency alternating currents coils. It manifested increased radiation resistance resonator coil leads to decrease quality factor ( Q -factor), which reduces (WPT) medium. The -factor strongly depending on conductivity, frequency, thickness block. Two...

Metamaterials, recognized as advanced artificial materials endowed with distinctive properties, have found diverse applications in everyday life, military endeavors, and scientific research. Starting from monolayer metamaterials, multilayer ones are increasingly researched, especially the field of electromagnetic wave absorption. In this article, we propose a metamaterial-absorber (MA) structure comprising two resonant layers crafted copper FR-4 dielectric. The presented MA exhibited an...

Abstract This work proposes a facile wide incident angle metamaterial absorber (MA) using multilayer structure. The suggested MA consists of two ring-shaped resonant layers. Under normal incidence, the proposed MPA exhibits an absorption peak at 4.31 GHz with 98.9%. impact on characteristics our is investigated experimentally for both transverse electric (TE) and magnetic (TM) modes. In TE mode, 70 degrees, peaks 4.23 4.39 absorptions 88.7% 97.5%, respectively. TM intensity maintained 90% up...

We numerically and experimentally demonstrated a metamaterial perfect absorber (MPA) in MHz region based on planar sandwiched metal-dielectric-metal structure. First, the single-peak absorption was obtained at 400 MHz. The ratios of periodicity unit cells thickness to wavelength are 1/12 1/94, respectively. advantage structural design mechanism for low-frequency MPA described detail by comparison between calculation, simulation, experiment. Influence incident angle electromagnetic (EM) wave...

We numerically and experimentally investigated a dual-band metamaterial perfect absorber (MPA), utilizing the near-field coupling of double split-ring resonators (DSRRs). Owing to between resonators, two arms in each DSRR resonate different phases, leading absorption. The proposed MPA also exhibits polarization-insensitive behavior maintains high absorption above 90% up wide range incident angle more than 45°. Finally, further consolidate our approach, multi-band is studied by exploiting...

Cobalt doped magnetite nanoparticles (Co x Fe3-x O4 NPs) are investigated extensively because of their potential hyperthermia application. However, the complex interrelation among chemical compositions and particle size means correlation with magnetic heating properties is not trivial to predict. Here, we prepared Co NPs (0 ≤ 1) investigate effects cobalt content on properties. A detailed analysis structural features indicated similarity between crystallite sizes as well non-monotonic change...

In this research, we have designed a hybrid metamaterial absorber (HMA) based magnetic material from C to the Ku-band. The was prepared by ball milling method with differences in mass ratio of FeCo alloy C. HMA structure consists four layers: FeCo–C, metallic (two punched-in rings L-shape edges), dielectric (FR-4), and continuous layer. widest absorption spectrum FeCo–C (75%C) frequency range 6.9–16.8 GHz exceeding 90%. mechanism has also been carefully analyzed through distribution surface...

An integrated model utilizing external parasitic capacitors for a dual-band metamaterial perfect absorber (DMPA) is proposed and demonstrated in the UHF radio band. By adjusting lumped on simple meta-surface, thickness of reduced to be only 1/378 1/320 with respect operating wavelength at 305 360.5 MHz, respectively. The simulations experiments confirm that DMPA can maintain an absorption over 91% wide range incident angle (up 55°) independent polarization radiation. Additionally, we examine...

Abstract Our study introduces a metamaterial with straightforward disk-like configuration that exhibits two prominent absorption peaks at wavelengths of 3960 and 4197 nm, 96.3% 94.1%, respectively. The design not only proved to be convenient for the practical fabrication, but also revealed resilience changes in structural parameters. Moreover, this offers versatility across wide range applications, due polarization-independent behavior. Additionally, investigation on thermal emission by...

We report the design and simulation of a microwave metamaterials-based perfect absorber using simple highly symmetric structure. The basic structure consists three functional layers: middle is dielectric, back metallic plane front ring metal. influence structural parameters on absorbance absorption frequency were investigated. results show an exceptional performance near unity around 16 GHz. In addition, insensitive to polarization incident beam due Finally, four nine rings with different...

Flexible and ultrathin wide-band metamaterial absorbers are suggested demonstrated in the microwave-frequency range. By using resonators of different sizes conductive fibers on metallic-pattern layer, total thickness absorber is reduced to be only 1/349 with respect operating wavelength at 0.97 GHz. We present absorption mechanism terms impedance matching free space, distributions surface current three-dimensional for power loss. In simulation, was over 97% 0.97–6.12 GHz, corresponding...

Abstract Multi-functional microwave metamaterials offer a great solution for active components and modules that are potentially applicable in stealth, energy, wireless communication systems/devices. However, it is challenging to realize multi-functional behavior cost-effective simple metamaterial system. This paper proposes demonstrates inspired by origami building blocks can be controlled mechanical stimuli. By mechanically changing folding states, the proposed switched from an...

In this work, we numerically and experimentally demonstrated a bi-functional metamaterial (BMM) behaving as single-band perfect absorber (SPA) or dual-band polarization converter (DPC) by integrating parasitic varactor diodes capacitors on flexible substrate. the SPA mode, high-absorption (with absorption of 90% at 3.9 GHz) was achieved. While in DPC state, BMM revealed experimental cross-polarization conversion 4.6 5 GHz with corresponding PCR 96 92%. The coincident both simulation...

We investigate theoretically and numerically the tunability of magnetic property metamaterial in THz region via thermal control. One component meta-atom is InSb, playing an important role as alterable metal. When temperature InSb stack increases from 300 to 350 K, resonance peak transmission spectra shows a shift 0.6 0.85 accompanied by stronger behavior. The S-parameter retrieval method realizes negative permeability achieved above heating range.

Anti-oscillating plasmas have been the key to perfect absorption induced by magnetic resonance. This is an achievement in recent research on metamaterials (MMs), especially GHz and lower-frequency regions of electromagnetic waves. Here, a comprehensive view introduced means both resonance electric meta molecules. A conventional metal-dielectric-metal MM absorber proposed obtain dual-band absorption. It clarified that mechanism due fundamental (at 7.2 GHz) third-order 18.7 resonances....

Abstract We demonstrate a multifunctional metamaterial (MM) structure which can behave like perfect absorber (PA) or polarization converter (PC) by controlling the lumped varactor. In PC mode, MM revealed cross-polarization conversion in frequency range from 2.0 to 7.0 GHz with polarization-conversion ratio of nearly 100%. While PA state, triple-band high absorption was achieved. addition, we investigated numerically and modes scaling down geometrical dimension orientation proposed unit...

In this work, we proposed a flexible broadband metamaterial perfect absorber (FBMPA) by exploiting pasted conductive-graphene ink on polyimide substrate. For the flat FBMPA, an absorption over 90% was found to cover wide frequency range (from 7.88 18.01 GHz). The high-absorption feature polarization-insensitive and regarded as stable with respect oblique incidence up 30 degrees of electromagnetic wave. high maintained well even when wrapped. That is, FBMPA attached cylindrical surfaces (with...

A small-size metamaterial perfect absorber operating at low frequency is proposed. Due to the special design, unit-cell dimension with respect wavelength very small, a/λ ∼ 1/17, absorption of 377 MHz. The strongly dependent on length zigzag wire. In addition, more than 94% in a wide range incident angle electromagnetic wave up 50°. results show that proposed promising be applied into devices radio region.

We demonstrated a multi-band plasmonic metamaterial absorber (MA), based on the near-field coupled resonators. In addition to individual resonances of resonators in proposed structure, which were split-ring resonator (SRR) and cross-shape structures, another resonance was also excited owing coupling resonators, revealing triple-band absorption. Furthermore, control absorption behavior, top SRRs, identical SRRs made graphene ink pasted. By increasing resistance ink, strength weakened,...