Even though ghost imaging (GI), an unconventional method, has received increased attention by researchers during the last decades, speed is still not satisfactory. Once data-acquisition method and system parameters are determined, only processing potential to accelerate image-processing significantly. However, both basic correlation compressed sensing algorithm, which often used for imaging, have their own problems. To overcome these challenges, a novel deep learning proposed in this paper....

Abstract In this work, a second-order Minkowski fractal broadband absorber based on conventional sandwich structure is proposed. The design was developed from the square-ring microwave absorber. improvement divided into two major parts: evolution of structural parameters as well patterns. first part realized analysis model and equivalent circuit, second by introducing internal coupling pattern using structure. This proposed exhibits an absorption greater than 90% between 0.283 terahertz...

In this paper, we present a novel metasurface design that achieves high-efficiency ultra-broadband cross polarization conversion. The is composed of an array unit resonators, each which combines H-shaped structure and two rectangular metallic patches. Different plasmon resonance modes are excited in resonators allow the states to be manipulated. bandwidth converter 82% central frequency, covering range from 15.7 GHz 37.5 GHz. conversion efficiency innovative new higher than 90%. At 14.43...

A wideband frequency-polarization-diverse reflection aperture (WFPRA) for coincidence imaging is proposed in this letter. The composed of polarization sensitive metamaterial cells with different resonant frequencies and rotation directions. cross-polarization information can also be used to generate test modes (uncorrelated spatial gain distributions) based on the conversion basic cell WFPRA. number uncorrelated significantly increased compared traditional case only one statistical dimension...

Traditional stealth technologies all have their problems such as high cost and large thickness. To solve the problems, we used novelty checkerboard metasurface in technology. Checkerboard does not conversion efficiency radiation converters, but it has many advantages small thickness low cost. So is expected to overcome of traditional technologies. Unlike other metasurfaces, improved further by using two types polarization converter units be arranged turn form a hybrid metasurface. Because...

A plasma-coding metasurface composite structure is proposed for broadband radar cross section reduction (RCSR). The consists of a plasma, coding metasurface, and an air gap between them. By designing the working frequency plasma electromagnetic (EM) waves can penetrate interact with EM are scattered in multiple directions by metasurface. These repeatedly reflected attenuated forming RCSR. In our work, inhomogeneous large characteristic span uniform combined investigated. covered has wider...

In this work, an ultrawideband spoof surface plasmon polariton (SPP) bidirectional endfire antenna is proposed based on wave vectors’ mismatching. One splitter structure connects two radiator structures to form the antenna, and types of slot lines are used design structures. Although SPP can transmit from structure, vectors in mismatched. Thus, will not be bounded mode when it propagates at decoupled by structures, thereby realizing a radiation pattern. The bandwidth depends decoupling...

“Magnetic window” is considered as an effective method to solve the communication blackout issue. COMSOL software package based on finite element utilized simulate propagation of right-handed circularly polarized wave in magnetized plasma sheath. We assume a double Gaussian model electron density and exponential attenuation magnetic field. The characteristics are analyzed by observation reflected, transmitted loss coefficient. numerical results show that sheath varies for different incident...

We propose a metasurface to achieve multi-band helicity dependent directional spoof surface plasmon polaritons (SPPs) coupling for circular polarized light in the microwave range. Our work shows that frequencies of SPPs on gradient are related dispersion relations metasurface, which indicate desired frequency can be manipulated by engineering. The proposed has counter-directional phase gradients different incidents and possesses multiple carefully designing geometric parameters each unit,...

An equivalent circuit model (ECM) is proposed for a Jerusalem cross metasurface structure loaded with plasma. Based on the microwave network theory, electromagnetic properties of composite are analyzed through this ECM. Due to wave-absorbing effect plasma, parallel conductive and inductive elements introduced ECM metasurface, forming structure. The element parameters extracted by genetic algorithm optimization. consistency between simulated reflection coefficient calculated ones proves...

The spatial modulation coincidence imaging (SMCI), as a novel kind of microwave method, is proposed in this paper. SMCI system provides new way to produce the time-space independent signal instead multitransmitter architecture with wideband randomly modulated radar imaging. Due some special features, metamaterial plate utilized reflective surface modulate incident construct random radiation field. resolution analyzed under large viewing angle two different transmitting signals. Reflective...

An ultra-thin metasurface is proposed to realize wideband polarization-independent anomalous reflection. The sub-wavelength resonator can produce different resonance modes, which are the result of combined effect dielectric and metallic structure. gradient done by six discrete orientation local provides a phase gradient. simulation measured results show that 9[Formula: see text]GHz bandwidth reflection achieved.

Abstract The surface plasmon polaritons (SPPs) have many potential application due to their local field enhancement and sub-wavelength characteristics. Recently, the gradient metasurface is introduced couple spoof SPPs in microwave frequency band. One of most important issue which should be solved narrowband coupling on metasurface. Here, proposed achieve wideband helicity dependent directional for circular polarized light. Our research show that determined by dispersion metasurface, so can...

A simple approach is proposed to design a new type of endfire antenna, which simultaneously possesses bidirectional and unidirectional radiation pattern in wideband. By the dispersion engineering, different frequency bands spoof surface plasmon polariton (SPP) modes are excited at two ports splitter structure, structure directly connected with radiator structures, utilized decouple SPP free space wave by mismatching, achieving bands. From 8.4 21.6 GHz, this designed antenna pattern, from...

A novel metasurface based on random phase gradients is proposed for radar cross-section (RCS) reduction. In this work, wideband, polarization-independent, wide-angle RCS reduction realized both circularly polarized (CP) waves and linearly (LP) waves, respectively. Thus, true polarization-independent by the metasurface. This composed of different types units, these units do not have certain periods. Under CP incidence LP incidence, can be formed The diffused because gradients, resulting in...

An ultra-thin metasurface is proposed to realize wideband polarization-independent anomalous reflection. The gradient done by 6 discrete orientation of the local sub-wavelength resonator, which provides a phase gradient. simulation and measured results show that 9 GHz bandwidth reflection achieved.

In this article, a method based on the equivalent circuit model (ECM) is proposed to study propagation characteristics of electromagnetic waves in inhomogeneous plasma. First, homogeneous plasma studied. The component parameters are obtained by inverting transmission characteristic curve full-wave simulation. Second, ECM extended plasma, such as three-layer distribution or double Gaussian were extracted under different parameters, and sufficient convergence genetic algorithm verified...

In this work, the design method of metasurface simultaneously arbitrarily controlling beam width and direction based on surface wave coupling decoupling is proposed. An impenetrable impendence model used to synthesize impendence. The proposed designed be lossless reciprocal, because accurate calculation established in work. reflected a Gaussian other with designable waist angles are designed. performances verified by full simulation experiment, which confirm validity arbitrary control direction.

A novel metamaterial computational ghost imaging (MCGI) is presented in this paper. Due to the properties of metamaterials, it can provide special feature which SLM or DMD does not have. Metamaterials also be used other bands plays a positive role extending application imaging.