A design methodology for developing lead-free bulk ceramics with large recoverable energy storage density was proposed in this study.

The findings in this study could broaden the applications of KNN materials a new field.

We propose to realize ultra-wideband polarization conversion metasurfaces in microwave regime through multiple plasmon resonances. An metasurface is designed using a double-head arrow structure and further demonstrated both numerically experimentally. Four resonances are generated by electric magnetic resonances, which lead bandwidth expansion of cross-polarization reflection. The simulated results show that the maximum efficiency nearly 100% at four resonance frequencies 1:4 3 dB can be...

Metasurfaces provide unprecedented routes to manipulations on electromagnetic waves, which can realize many exotic functionalities. Despite the rapid development of metasurfaces in recent years, design process metasurface is still time-consuming and computational resource-consuming. Moreover, it quite complicated for layman users as plenty specialized knowledge required. In this work, a method named REACTIVE proposed basis deep learning, learning has shown its natural advantages...

Phase gradient metasurface (PGMs) are artificial surfaces that can provide pre-defined in-plane wave-vectors to manipulate the directions of refracted/reflected waves. In this Letter, we propose achieve wideband radar cross section (RCS) reduction using two-dimensional (2D) PGMs. A 2D PGM was designed a square combination 49 split-ring sub-unit cells. The additional along two simultaneously, leading either surface wave conversion, deflected reflection, or diffuse reflection. Both simulation...

In this paper, we propose to achieve wideband linear-to-circular (LTC) polarization conversion by ultra-thin bi-layered metasurfaces. As an example, LTC metasurface operating in 11.4–14.3 GHz is designed and fabricated, which composed of two layers metallic pattern arrays separated a 1.5 mm-thick dielectric spacer. When linearly polarized waves impinge on the metasurface, transmission greater than 90% over wide frequency range from 11.0 18.3 GHz. Meanwhile, axis ratio lower 3 dB 9.8–18.3...

Lightweight structures with multi-functions such as electromagnetic wave absorption and excellent mechanical properties are required in spacecraft. A three-dimensional metamaterial absorber consisting of honeycomb resistive films was proposed fabricated through 3D printing silk-screen technology. According to simulation experiment results, the present can realize an absorptivity more than 90% a wide band 3.53-24.00 GHz, improve absorbing efficiency for transverse magnetic (TM) waves oblique...

Abstract Metasurfaces have provided unprecedented freedom for manipulating electromagnetic waves. In metasurface design, massive meta-atoms to be optimized produce the desired phase profiles, which is time-consuming and sometimes prohibitive. this paper, we propose a fast accurate inverse method of designing functional metasurfaces based on transfer learning, can generate patterns monolithically from input profiles specific functions. A learning network GoogLeNet-Inception-V3 predict phases...

Metasurfaces, composed of 2-D planar arrays sub-wavelength metallic or dielectric scatterers, have provided unprecedented freedoms in manipulating electromagnetic (EM) waves upon interfaces. The development metasurface has always been closely related to antennas. On the one hand, was developed from reflect arrays/transmit that are used as reflectors/lens antennas, and most fundamental theories metasurfaces directly borrowed antenna array theories; on other antennas flourished expedited by...

Abstract The power of controlling objects with mind has captivated a popular fascination to human beings. One possible path is employ brain signal collecting technologies together emerging programmable metasurfaces (PM), whose functions or operating modes can be switched customized via on-site programming pre-defined software. Nevertheless, most existing PMs are wire-connected users, manually-controlled and not real-time. Here, we propose the concept remotely mind-controlled metasurface...

We experimentally investigate the electromagnetic (EM) responses of a broadband reflective polarization rotator under normal incidence. It is found that can generate multi-order plasmon resonances at three neighboring frequencies. At each frequency, behaves as high impedance surface along one axis while metallic other axis. Thus, 180° phase difference generated between two orthogonal components reflected waves. When incident wave polarized by 45° with respect to symmetry rotator, waves...

A filter-antenna consisting of a monopole antenna and conical frequency selective surface (FSS) radome was designed investigated. coupled-resonator spatial filter (CRSF) used to design an FSS array with stable performances, then specific geometrical layout proposed construct radome. We technically investigated the combination Both simulated measured results show that keeps input reflection coefficient, radiation pattern within passband, reflects out-of-band signals. Such properties will...

Gradient metasurfaces (GMs) can provide pre-defined wave vectors that are along the surface of GMs. When additional vector is greater than incident waves, waves be coupled efficiently as spoof plasmon polaritons (SPPs) even under normal incidence. In this Letter, design SPP couplers was proposed based on A high-efficiency coupler designed using split-ring resonators. Both simulation and experiment show GM achieve nearly perfect SPP-coupling incidence at frequency.

The naturally occurring water has frequency dispersive permittivity at microwave frequencies and thus is a promising constituent material for broadband absorbers. Here, we develop as the dielectric spacer in substrate of metal-backed metamaterial (MM) designed hybrid low-permittivity material. Such design allows tight packaging easy fabrication absorber. We obtain absorption temperatures interest by designing MM inclusions. Additionally, performance water-substrate absorbers could be tunable...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this letter, a novel high-directivity microstrip patch antenna (MPA) based on planar zero-index metamaterials is presented. An averaging effect over the metamaterial structure yields an effective permittivity that approaches zero at 8.75 GHz, which results in with index of refraction. Both simulation and experimental show directivity effectively enhanced refraction characteristics metamaterial. </para>

Abstract A new concept of the coding phase gradient metasurface (CPGM) is proposed, which constructed using as elements. Different from previous (CM), both sequences and phases in elements are designed to manipulate electromagnetic (EM) wave for CPGMs, thus manipulation will be more flexible. As an example, wide-band, wide-angle CPGMs with zero non-zero based on Pancharatnam-Berry (PB) achieved co-polarization reflection unit cells under circularly polarized (CP) incidence. Both...

In this letter, we propose an anchor-shaped loop unit-cell structure for compact frequency selective surfaces (FSSs) with dual-bandstop behavior in two wireless local area network (WLAN) frequencies 2.4 and 5.0 GHz. The proposed FSS possesses 230- 300-MHz bandwidths insertion loss less than -20 dB around the central operating GHz, respectively. addition, exhibits excellent miniaturization 0.065 λ × 0.076 unit cells, where represents free-space wavelength. Furthermore, provides a stable...

In this paper, a transparent metamaterial absorber (MA) loaded with water substrate is presented, which can simultaneously achieve enhanced broadband microwave absorption and tunable infrared radiation. As proof, the indium tin oxide (ITO) films are first introduced here as frequency selective surface (FSS) on top layer reflective backplane ground layer. Next distilled combined polymethyl methacrylate (PMMA) employed hybrid in middle. Simulation experimental measurements show that...

Lossless coding metasurfaces and metamaterial absorbers have been widely used for radar cross section (RCS) reduction stealth applications, which merely depend on redirecting electromagnetic wave energy into various oblique angles or absorbing energy, respectively. Here, an absorptive metasurface capable of both the flexible manipulation backward scattering further wideband bistatic RCS is proposed. The original idea carried out by utilizing elements, such as absorbers, to establish a...

A highly selective tri-band bandpass frequency-selective surface (FSS) is presented by cascading three layers of periodic arrays. The middle layer composed double square loops (DSLs) while the two exterior are gridded-double (G-DSLs) structure. proposed FSS can provide multitransmission zeros which lead to a wide out-of-band rejection between each adjacent passbands and sharp behavior on both sides passband. Furthermore, exhibits stable response over range incident angles for TE TM...

Wireless link has need of an omnidirectional antenna like dipole, but with higher gains. Of course, there is no way achieving both them simultaneously. To solve this contradiction, we propose to design multibeam antennas, which divide the radiation pattern antennas into several beams. The antenna, based on spoof surface plasmon polaritons (SSPPs) mode coupling, consists a feed monopole and N double-side corrugated metallic strips circling around feed. fields are coupled SSPP waves that...

A gradient metasurface is proposed to obtain both surface wave coupling and anomalous reflection. The unit cell of the composed by six electric field coupled resonators in different rotation angle, which provides a phase gradient. simulation measured results show that this can work at 7.8 GHz as coupler 10.288 providing phenomenon At two frequencies, direction reflection polarization-controlled, efficiencies are polarization-invariant. left-handed polarization incidence, opposite situation...

Naturally occurring water is a promising candidate for achieving broadband absorption. In this work, by virtue of the optically transparent character water, water-based metamaterial absorbers (MAs) are proposed to achieve absorption at microwave frequencies and optical transparence simultaneously. For purpose, indium tin oxide (ITO) polymethyl methacrylate (PMMA) chosen as constitutive materials. The encapsulated between ITO backed plate PMMA, serving loss well material. Numerical...

On the basis of generalized Snell's law reflection, we propose to achieve frequency scanning radiation by decoupling spoof surface plasmon polaritons (SSPPs) from a corrugated metallic strip (CMS). Phase gradient metasurface (PGM) is utilized modulate dispersion behavior CMS. Since phase PGM contrary wave vector SSPPs, curve SSPPs can be translated into fast zone, leading radiation. As an example, demonstrate antenna operating at 8.8-10.7 GHz. A prototype was designed, fabricated, and...