We analyze an S-shaped inclusion for the realization of metamaterials exhibiting left-handed properties. Unlike most conventional inclusions used so far that are composed two separate geometries-typically a split ring and rod-the proposed in this paper is made only one element which yields overlapping negative permittivity permeability response over frequency band about 2.6 GHz. By adopting geometry, we manage to lower down level band, thus allowing occur. Therefore, structure works as stand...

Mode division multiplexing (MDM) using orbital angular momentum (OAM) is a recently developed physical layer transmission technique, which has obtained intensive interest among optics, millimeter-wave, and radio frequency due to its capability enhance communication capacity while retaining an ultra-low receiver complexity. In this paper, the system model based on OAM-MDM mathematically analyzed it theoretically concluded that such architecture can bring vast reduction in complexity without...

Communications using the orbital angular momentum (OAM) of radio waves have attracted much attention in recent years. In this paper, a novel millimeter-wave dual OAM mode antenna is cleverly designed, which 60 GHz wireless communication link with two separate channels experimentally demonstrated. The main body traveling-wave ring resonator feeding ports fed by 90° hybrid coupler. A parabolic reflector used to focus beams. All components are fabricated 3D printing technique and electro-less...

An ultralow reflectivity spiral phase plate (SPP) is proposed to generate an orbital angular momentum (OAM) beam at millimeter-wave frequency. The SPP composed of unit cells whose equivalent permittivity and thickness are designed satisfy the impedance matching condition based on transmission line theory. fabricated by a 3D printing technique. near-field far-field distributions clearly exhibit azimuth shifting, far field directivity pattern shows that direction, gain, 3-dB beam-width main...

A traveling-wave circular loop antenna with its phase distribution along the circle of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\bm{l}\bm{\varphi}$</tex-math></inline-formula> is demonstrated to generate twisted radio wave. Theoretical formulations radiation fields are deduced in cylindrical coordinate system and used analyze transmission characteristics, such as patterns, evolution polarization...

A one-dimensional metamaterial is realized using three connected Ω rings printed back-to-back and reversed on two sides of a dielectric substrate. Both transmission prism experiments are reported, yielding concordant results the presence left-handed frequency band. Experiments show reduced losses an enlarged

A cloak that can hide living creatures from sight is a common feature of mythology but still remains unrealized as practical device. To preserve the wave phase, previous cloaking solution proposed by Pendry and colleagues required transformation electromagnetic space around hidden object in such way rays bending inside region have to travel faster than those passing it by. This difficult phase preservation requirement main obstacle for building broadband polarization-insensitive large...

A multilayer phase-shifting-surface-based flat plate is designed to offer a combination of lens and spiral phase (SPP) for orbital angular momentum (OAM) beam generation convergence at 60 GHz. The proposed design consists series phase-shift unit cells control the emergent form purpose focusing. results simulation experiment verify that OAM with small divergence angle can be achieved.

Plane spiral orbital angular momentum (OAM) wave is a new form of OAM-carrying electromagnetic that propagates along the transverse direction. A traveling-wave circular slot antenna can generate plane OAM waves developed and experimentally demonstrated in this letter. The excited by 90° hybrid coupler. In order to ensure are propagating plane, ring horn added outside antenna. prototype with states l = ±3 for 10-GHz operation fabricated measured. near-field phase distributions clearly...

Based on metallic traveling-wave ring-slot structure, an easily realized four-orbital angular momentum (OAM)-mode antenna capable of generating four coaxially propagating waves with OAM modes <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$l$</tex-math></inline-formula> = xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathbf {-3}$ </tex-math></inline-formula> ,...

In conventional approaches to realizing microwave photonic filters (MPFs) with rectangular response, both positive and negative coefficients should be included in the systems, which is a difficulty incoherent MPFs. Electrical or optical ways realize MPFs bipolar taps, such as those using balanced detectors based on two opposite modulation slopes of dual-input Mach-Zehnder modulators, usually involve more components compared unipolar taps. this Letter, design response all proposed. There only...

Wireless communication using electromagnetic wave carrying orbital angular momentum (OAM) has attracted increasing interest in recent years, and its potential to increase channel capacity been explored widely. In this paper, we compare the technique of uniform linear array consist circular traveling-wave OAM antennas for multiplexing with conventional multiple-in-multiple-out (MIMO) method, numerical results show that based MIMO system can while distance is long enough. An equivalent model...

In this letter, we experimentally demonstrate terahertz (THz) photonic wireless transmission of high-speed quadrature-phase-shift-keying (QPSK) and 16 quadrature amplitude modulation (16-QAM) signals in the 350-GHz band, with an effort to extend reach ultrafast 100 Gbit/s. experiment, a narrowband unitraveling-carrier photodiode (UTC-PD) is used for heterodyne generation THz communication signals, which transparent optical formats. Experimental results show that 30 GBd/s QPSK (60 Gbit/s) 25...

The proliferation of wireless broadband services have significantly raised the demand for high data rates. Due to limited bandwidth radio frequency (RF) bands that are currently in use communication purposes, choice `Terahertz (THz) region' (0.3-10 THz) is getting favored thanks its merits bringing together and optical communications with photonics technologies. We report on an experimental demonstration a hybrid THz photonic-wireless transmission based orthogonal polarization dual-antenna...

Recently, remarkable efforts have been made in developing wireless communication systems at ultrahigh data rates, with radio frequency (RF) carriers the millimeter wave (30–300 GHz) and/or terahertz (THz, &amp;gt;300 bands. Converged technologies combining both electronics and photonics show great potential to provide feasible solutions superior performance compared conventional RF technologies. However, technical challenges remain be overcome order support high rates considerably distances...

We experimentally demonstrated an alternative approach of invisibility cloaking that can combine technical advantages all current major strategies in a unified manner and thus solve bottlenecks individual strategies. A broadband cylindrical cloak free space is designed based on scattering cancellation (the previous plasmonic cloaking), implemented with anisotropic metamaterials (a fundamental property singular-transformation cloaks). Particularly, nonsuperluminal propagation electromagnetic...

A novel technique for instantaneous microwave frequency measurement using an optical phase modulator is proposed and demonstrated. In the system, a signal with its to be measured modulated on two wavelengths at modulator, phase-modulated signals sent dispersive element, detected photo-detectors. Due chromatic dispersion of will experience different power fading, leading versus functions. fixed relationship between powers established. By measuring powers, estimated. Compared techniques...

An invisibility cloak that can hide an arbitrary object external to the itself has not been devised before. In this Letter, we introduce a novel way design remote cloaking device makes any located at certain distance invisible. This is accomplished using multi-folded transformation optics remotely generate hidden region around no field penetrate and does disturb far-field scattering electromagnetic field. As result, in stay position or move freely within remain Our idea further extended...

A new form of plane spiral orbital angular momentum (PS-OAM) carrying wave with the harmonics exp(-jlφ) as a complete set eigenmodes is proposed to realize beam steering. Such possesses fundamental characteristics an OAM-carrying wave, i.e., phase distribution, yet propagates along transverse directions. Hence, it owes unique advantages for use in realizing desired radiation beams, while avoids puzzles encountered by traditional beams. Various OAM mode grouping using superposition PS-OAM...

Photonics-aided terahertz (THz) wireless systems have been progressively developed to accommodate the forthcoming communication with extremely high data rates in recent years. However, restrained by obtainable signal-to-noise ratio (SNR) and dimensions explored THz photonic systems, achieving of Tbit/s beyond is still challenging. In this paper, we present a multi-dimensional multiplexing THz-over-Fiber system, efficiently benefiting from gain both optical wavelength space domains. Enabled...

We present a combined double S-shaped metamaterial structure that exhibits left-handed property over wide frequency band of 6GHz. The transmission experiment, phase measurement, and prism refraction experiment from the confirm presence negative index refraction.

A simple method for the generation of optical single sideband modulation 11-GHz radio-over-fiber system is presented. Based on stimulated Brillouin scattering in fiber, lower modulated signal amplified and upper attenuated as well, which improve performance. In experiment, about 2-dB signal-to-noise ratio gain attained at 10-Mb/s with quadrature-phase-shift keying format.