We present a conformal metamaterial with simultaneous optical transparency and broadband millimeter-wave absorption for curved surface. By tailoring the reflection response of meta-atoms at oblique angles, it is possible to achieve excellent performance from 26.5 40.0 GHz within wide angular range 0° 60° transverse-electric transverse-magnetic waves. In meantime, by employing transparent substrates, including polyvinyl chloride polyethylene terephthalate, good transmittance (80.1%)...

We propose a strategy to convert linearly polarized wave from single point source an orbital angular momentum (OAM) by arbitrary polarization via anisotropic frequency selective surface (FSS) in the microwave frequency. By tailoring geometries of FSS elements, reflection-phases x and y polarizations are engineered encoded independently, which allows us design eventual state generated OAM vortex beam elaborately selecting individual coding sequences for each polarization. Two types FSSs...

A method for fast design of broadband terahertz diffusion metasurface is presented. The proposed composed by three kinds simply patterned elements with different resonant properties. To obtain the best performance lowest backward reflections, a genetic algorithm developed to manipulate resonances determination element geometries. An inverse discrete Fourier transform used predict scattering pattern high accuracy and low time consumption, significantly enhancing efficiency array-pattern...

In this article, we propose a wideband fully metallic impedance-matching horn lens antenna based on glide symmetry realized in the gap waveguide technology. A multiple iterative method is adopted, which overcomes limitation of large phase deviations at interface traditional antennas, thus increases directivity as result. Moreover, glide-symmetric configurations inner pins within are employed to construct artificial dielectric lens, with advantage ultralow dispersion, especially helpful...

We propose a hybrid dispersion compensation method to design wideband fixed-beam leaky-wave antennas (LWAs), with the tilting angle customizable in both forward and backward quadrants. In previous work, triangular dispersive prism constituted by metallic pins was presented compensate for of traditional LWAs achieve squint-free radiation relative bandwidth 20%. However, that suffered from drawbacks large geometry limited angular range. To overcome these limitations, here broadband gradient...

In the past few years, orbital angular momentum (OAM) has aroused great interest in scientific communities, because it shows potential for enhancing capacities of radio and optical communication systems. Here, we propose anisotropic metasurfaces to generate multiple OAM vortex beams at microwave frequencies. A phase compensation theory is presented, order determine distributions on metasurfaces, This enables independent control beam numbers, polarizations, orientations, topological charges...

Leaky-wave antenna (LWA) is known as a type of traveling with dispersive frequency responses, which has found important applications in modern communication, imaging, and radar systems. The beam scanning rate key consideration some since it can minimize the bandwidth requirement system, during broad angular regions. However, sweeping linearity, namely range per unit frequency, seldom considered at same time published literature. In this article, we propose waveguide-type LWA working from...

A novel approach is used to miniaturise the array size and broaden bandwidth (BW) of a multilayer antenna‐filter antenna‐ based frequency selective surface (FSS). Although such FSSs have broadly been investigated for higher selectivity less thickness, they still own high periodicity lower BW. The proposed fractal FSS with centre square slots consists three metallic layers, separated by two dielectric substrates unit cell sub‐wavelength order (0.2 λ ₒ). Central are added in external Minkowski...

ABSTRACT A novel combinatorial triangle‐type artificial magnetic conductor (AMC) structure for radar cross section (RCS) reduction is presented in this article. The AMC part conventional chessboard configuration replaced with four parts, so that the power can be transferred into more directions leading to peak scattered field reduction. simplified model constructed analyze behavior of proposed structure. simulated results show value reduced by than 5 dB compared and bistatic RCS below −10 a...

The medium-voltage direct current (MVDC) distribution grids have been given significant attention because of their wide applications in the grid integration renewable energy sources and improvement stability quality grid. However, due to absence natural zero crossings high rate short-circuit current, fault interruption MVDC systems is more problematic than that ac systems. Several types schemes proposed, vacuum interrupter-based dc circuit breaker (DCCB) a promising solution for...

Single-mode operation in a rectangular waveguide is very important, since the existence of multimodes may arouse distortions carried signals due to modal dispersion. High-order mode means multiple periods field transverse cross section, with distinct electromagnetic properties from dominant mode. Although numerous methods are proposed achieve selection within waveguide, they only permit specific high-order modes survive frequency range. However, it still remains great challenge control...

Staircase transmission constrained unit commitment (TCUC) formulations have been used for decades and are considered as energy‐based TCUC (EbUC). Recently, it has reported that EbUC may result in undeliverable energy schedules. Some power‐based (PbUC) proposed to address this problem. However, exact continuous time‐based power outputs of units usually approximated these PbUC ramp‐rate capacities not accurately modelled. Besides, the implicit coupling between constraints spinning reserves is...

In this article, a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1\times 12$ </tex-math></inline-formula> millimeter-wave (mmW) linearly tapered slot antenna (LTSA) array, fed by high-order waveguide modes, is introduced. Due to the antiphase characteristic between adjacent channels of power divider based on TE notation="LaTeX">${}_{2n,0}$ mode waveguide, cross-polarized E-field components can cancel...

A third-order miniaturized band-pass frequency selective surface (FSS) using Minkowski fractal islands is proposed with broader bandwidth and designed specifically for an oblique incidence angle of 60°. The operating band 1 GHz to 16 GHz. FSS design based on antenna-filter-antenna concept employing geometries patches a cross-shaped slot the ground. Presented structure demonstrates fractional (BW) 60% from 7 13 GHz, which corresponding 3 dB BW 6 (from GHz) both reflection (S <sub...

We propose a dual-polarized leaky-wave antenna (LWA) with orthomode based on metallic square waveguide for broadband endfire radiation applications. Several double-sided slots acting as elements are notched the to produce an pattern. To overcome restriction associated condition of linear array, core periodically loaded pins is used control dispersion proposed double-sided-slot waveguide. By optimizing height distribution loading along longitudinal direction using cosine function, stable can...

Middle voltage direct current distribution is a promising solution for the future electric power system its advantage in integration of renewable energy sources and improving stability grid. However, rapid rise short-circuit fault absence natural zero crossing makes DC interruption main problem system. And, dielectric recovery strength vacuum interrupter critical factor to improve capacity reliability interruption. In order measure interrupter, an experiment circuit designed this paper...

In this communication, a wideband Fabry–Pérot resonator antenna (FPRA) is proposed. An optimized partially reflective surface (PRS) with transverse permittivity gradient (TPG) composed of four nonrotationally symmetric sections employed in the design antenna. The use PRS results more than 31% improvement 3 dB gain bandwidth compared traditional rotationally PRS. Furthermore, two types nonresonant metamaterials (metallic-ring and etching-hole unit cells) are used to implement equivalent way,...

Background: Electromagnetic wave absorbers that has near perfect performance have been studied since 2008, various one dimensional and two structures optimized. High absorption at certain frequency can be easily realized. However, high covers broad band is relatively hard to Method: In this paper, a nickel nanograting designed by using rigorous coupled analysis theory. The effect of grating height width on analyzed physically equivalent medium theory Fabry-Pérot resonate Results: Because the...

In the rapid development process of cylindrical drip emitter, traditional CFD analyzing method was generally carried out based on planar model labyrinth channel. However, result obtained by this obviously different with experimental data. paper prototype channel proposed and analysis hexahedral mesh to solve problem. Then flow rate anti-clogging performance emitter were predicted stereo Consequently, simulation results verified finalized according its hydraulic experiment.

High order harmonic may affect antenna performance, reduce efficiency and cause electromagnetic interference. So suppression of the has been a focus issue in field design. It is demonstrated that photonic band gap (PBG) structure defect ground (DGS) provide an effective way for suppressing high harmonics antenna. In this paper, novel with wideband presented by using proposed complementary opening defected microstrip (CODMS). The cell great advantages miniaturization contains two fundamental...

The German federal government has set very high targets for renewable energy. In recent years, Germany’s energy developed rapidly. Germany leads the world in transformation, with wind and solar generating capacity accounting nearly half. experience practice developing are worthy of our country’s reference. this paper, development status power grid is introduced. And paper mainly analyzes achieving a proportion new access 2019.

Band-stop filters play an important role in wireless communications by blocking signals within specified frequency bands and allowing useful frequencies to pass through. As a special type of higher symmetry, glide symmetry achieves the reconfiguration band gaps manipulating dispersion relationships periodic structures, which is great value for filter designs. However, existing band-stop based on are mainly realized with three-dimensional transmission lines, only one gap reconfigured. Here,...