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...

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...

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.

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...

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...

Complex-amplitude holographic metasurfaces (CAHMs) with the flexibility in modulating phase and amplitude profiles have been used to manipulate propagation of wavefront an unprecedented level, leading higher image-reconstruction quality compared their natural counterparts. However, prevailing design methods CAHMs are based on Huygens-Fresnel theory, meta-atom optimization, numerical simulation experimental verification, which results a consumption computing resources. Here, we applied...

Polarization is one of the basic characteristics electromagnetic (EM) waves, and its flexible control very important in many practical applications. At present, most multifunction polarization metasurfaces are electrically tunable based on PIN varactor diodes, which easy to operate have strong real-time performance. However, there still some problems them, such as few degrees freedom planar structure control, complex circuit, bulky sample, high cost. In view these shortcomings, this paper...

We propose a broadband perfect polarization conversion metasurface composed of copper sheet-backed asymmetric double spilt ring resonator (DSRR). The convertibility results from metallic ground and multiple plasmon resonances the DSRR. Physics are governed by electric magnetic resonances. Both simulation measured show that ratio (PCR) is higher than 99% for both x- y-polarized normally incident EM waves fractional bandwidth about 34.5%. possesses merits high PCR broad bandwidth, thus has...

A two-dimensional (2D) coding phase gradient metasurface (CPGM) is proposed for radar cross section (RCS) reduction in this work. The 2D super cell employed to serve as the element. primary pattern of element will be modulated by designed gradient. Thus, a more flexible method scattering manipulation achieved both and sequences. specific patterns CPGM under modulation sequence were analyzed. controllable backward diffusion was realized based on Pancharatnam–Berry modulating sequence. Both...

Abstract In this paper, we propose a method of designing ultra-wideband single-layer metasurfaces for cross-polarization conversion, via the introduction Fano resonances. By adding sub-branches onto unit cell structure, induced surface currents are disturbed, leading to coexistence both bright and dark modes at higher frequencies. Due strong interaction between two modes, resonance can be produced. way, five resonances in all produced by metasurface. The first four conventional generated...

Wireless monitoring systems for the marine environment are important rapidly growing subsea developments. The power supply of wireless sensor nodes within systems, however, is a major challenge. This study proposes novel piezoelectric wave energy converter (pWEC) device to sensing nodes. Unlike previous studies, proposed utilizes contactless pWEC technology in which spring pendulum provides two-stage frequency amplification 3.8 times low-frequency environments. consists floating body, inner...

In this letter, we proposed to achieve wideband polarization-independent anomalous reflection for linearly polarized (LP) waves based on the phase gradient metasurface (PGM) with a dispersionless gradient. A polarization-keeping reflector circularly (CP) was firstly presented. Based reflector, reflective PGM designed realize but adverse gradients left- and right-handed (LCP RCP, respectively) waves. Under normal incidence, high-efficiency occurs both LCP RCP opposite-signed angles. LP wave...

A novel design of spoof surface plasmon polariton (SSPP) planar antenna is proposed based on the wave vector modulation transmissive phase gradient metasurface (TPGM). The consists TPGM placed a certain distance above SSPP guided structure, exhibiting directional radiation property according to generalized Snell's law. As an example, fed by rectangular waveguide designed using wideband polarization rotating TPGM. Simulated and experimental results, agreeing well with each other, show that...

Vortex beams with orbital angular momentum (OAM) can remarkably increase the channel capacity without signal process, thus attract more and attention of researchers, various novel methods generating vortex blow out. In this work, a circular-polarized beam reflector antenna was proposed via integrating generated metasurface focusing metasurface. The consists feed helical antenna. phase distribution combines OAM required which is used to generate from point source. measured results agree well...

The traditional frequency selective surface (FSS) needs further improvement with the development of stealth technology, and design multifunctional FSSs is essential. In this letter, an active absorptive FSS (AFSS) has been designed based on absorption structure spoof plasmon polariton (SSPP) switching activity FSS. embedded PIN diodes realizes shift two transmission/reflection bands by controlling bias voltage feed network, which switches from one band-pass response (at around 3.06 GHz) to...

Abstract Tailoring the phase and amplitude of electromagnetic waves has drawn great attention in microwave, terahertz, even optics domains. However, existing method for simultaneous control these two essential properties suffers from inadequate efficiency narrow bandwidth, especially microwave devices. Here, a strategy overcoming this difficulty is proposed by introducing ohmic sheet into Fabry–Pérot‐like cavity. The arbitrary modulation can be realized changing geometric parameters...

Polarization, as an important property of light, has been widely discussed in modern detecting and radar systems. A polarization converter that can be used to achieve dynamic control is regarded excellent alternative for implementing the integrated functionalities communication stealth. In this work, we propose a paradigm meta-converter states shifting from linear-to-linear (LTL) linear-to-circular (LTC) polarization. The strategy achieved by loading voltage-controlled PIN diodes on...

Abstract The integrated modulation of radiation and scattering provides an unprecedented opportunity to reduce the number electromagnetic (EM) apertures in platform while simultaneously enhancing communication stealth performance. Nevertheless, achieving full‐polarization, arbitrary amplitude, phase remains a challenge. In this paper, strategy that realizes space‐time coding within same frequency band, which enables simultaneous independent amplitude phase, is proposed. To address...

Abstract Vortex beams carrying orbital angular momentum have captivated great interest in the past few decades due to inspiring application potential both optical and microwave fields. More recently, assisted by Pancharatnam–Berry (PB) phase‐based meta‐atom, achieving spin–orbit‐converter becomes an encouraging topic. Commonly, however, spin–orbital‐converters are based on discontinuous phase distribution, which inevitably deteriorates their overall performance. To overcome this difficulty,...

Abstract The continuous increase in communication capacity is accompanied by an transmission frequency, which creates new demands on the efficiency modern. Signal relay can distance, however, conventional repeaters signal a specified direction, difficult to accommodate when receiving device suddenly appears around repeater. In this work, we propose repeater, implemented adaptively reconfigurable multi-beam reflective metasurface based multispectral detection. with varactor diodes designed...