In this paper, a novel polarization-reconfigurable converter (PRC) is proposed based on multilayer frequency-selective surface (MFSS). First, the MFSS designed using square patches and grid lines array to determine operational frequency bandwidth, then corners of are truncated produce phase difference 90° between two orthogonal linear components for circular polarization performance. To analyze synthesize PRC array, mechanism described in detail. The relation states as function rotating...

In this letter, a novel dual zeroth-order resonance (ZOR) by using composite right- and left-handed (CRLH) metamaterial transmission lines structure is proposed for compact multiband antenna design of smart mobile phone. The theory ZOR multimode technique are particularly recommended to covering GSM850/900 (824-960 MHz) DCS1800/PCS1900/UTMS (1710-2170 MHz). order achieve broad operation bandwidth, the consists three parts that can generate two modes lower band λ/4 resonant mode upper band....

In this paper, we present an approach to capture markerless human motion and recognize poses. Different body parts such as the torso hands are segmented from whole tracked over time. A 2D model is used for detection tracking, while a skin color utilized tracking. Moreover, 3D location of these calculated further pose recognition. By transferring coordinates both into normalized feature space, simple classifiers, nearest mean classifier, sufficient recognizing predefined key The experimental...

In this letter, we design an external invisibility cloak that has the cloaking performance for various scattering objects positioned in outer canceled air layer. The arbitrary geometry, and “anti-objects” embedded negative index shell can keep same shape without being geometrically transformed. Compared to traditional cloak, a finite layer but does not cover surfaces. smaller size than cloak. Simultaneously, object core also be cloaked see outside situations. This system produce illusion image

A novel robust watermarking scheme based on wavelet transform is presented in this paper. The watermark embedded into significant triplet of coefficients the three lowest detail subband images. embedding algorithm only needs to modify a small amount coefficients, which leads very distortion and guarantees visual quality watermarked image. performance proposed tested series normal attacks image processing, such as JPEG compression, Gaussian noise addition, median filter, etc. corresponding...

In this letter, a dual-band multiple-input-multiple-output (MIMO) antenna array for mobile handheld devices is proposed. The two dual zeroth-order resonance antennas that use the composite right- and left-handed (CRLH) transmission-line theory are placed at corners of system printed circuit board (PCB) with an edge-to-edge distance 12 mm (1/30 λ 850 MHz). neutralization-lines technique employed to reduce mutual coupling between antennas. efficiency ( > 30%) can cover GSM850/900...

In this paper, we derive the material parameter formulae for designing an electromagnetic invisibility anti-cloak of two-dimensional arbitrary geometry, which is conformal with cloaked object. Different shapes anti-cloaks are proposed to verify correctness and effectiveness formulae. The simulation results show that can break cloak shielding make external waves into cloak. This not only realize transfer information, but will affect role stealth.

A new design of a compact ultra-wideband antenna with sharp band-notched characteristics is presented. By utilising an interdigital capacitance loading loop resonator, the presented has very high selectivity and achieves dual notches lower WLAN 5.25 GHz upper 5.775 bands, while it can still receive signals from intermediate band between 5.35–5.725 effectively saves many more useful frequencies. To reject interference WiMAX 3.5 GHz, arms forked-shaped radiator are folded to form pair coupled...

In this letter, a two-dimensional multifunctional cylindrical electromagnetic concentrator (CEMC) with arbitrary geometries is proposed using transformation optics (TO) and the concept of complementary media. The CEMC not only can concentrate waves power, but also make objects around invisible. addition, produce an illusion effect. An example circular designed studied by full-wave simulations. Furthermore, simplified constitutive parameters are simulated. With reduced parameters, be...

A low profile chip-package stacked-patch antenna is proposed by using temperature cofired ceramic (LTCC) technology. The employs a to achieve two operating frequency bands and enhance the bandwidth. height of decreased 4.09 mm (about<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>λ</mml:mi></mml:mrow></mml:math>/25 at 2.45 GHz) due shorted pin. package mounted on 44 × 2 ground plane miniaturize volume system. design parameters effect cavity are carefully...

EM concentrators are used in field and energy focusing. However, the already proposed concentrators, devices compressing an enclosed region to its central part, necessitate anisotropic inhomogeneous materials that can hardly be realized applications. In this work, two-dimensional strip designed based on transformation optics, which compress marginal part. Importantly, devised with fixed-compressive ratios via rotated-layered systems composed of two kinds isotropic homogeneous materials,...

The work presented in this paper concerns a method for the miniaturized frequency selective surface (FSS) based on meander lines. A dual-bandstop FSS structure lines with spiral-shape is proposed and simulated. equivalent circuit current distributions are introduced to explain performance. size of unit cell 10 mm, which about 0.037 wavelength at first resonant frequency. Simulation results indicate that has shift smaller than 1% different polarizations an oblique incident angle 60°....

Abstract In this paper, a polarization‐independent optical transparent absorber with notch band has been designed, fabricated, and experimented. The proposed structure is composed of three layers made indium tin oxide (ITO) films different surface resistances separated by polydimethylsiloxane substrates, which can realize ultra‐wideband absorption. presents two discrete absorption bands in the frequency range 3.65–28.82 37.72–43.69 GHz, reflective behavior from 31 to 36.57 GHz. Compared...

In this paper, a novel active hybrid switchable rasorber (AHSR) is proposed, which provides transmission and reflection frequency band, hybridizing low-frequency absorption high-frequency diffusion to reduce out-of-band radar cross section (RCS). The AHSR consists of top polarization conversion (PC) layer, an intermediate lossy bottom layer. PC layer can deflect the direction electromagnetic waves, achieving RCS reduction through diffusion. absorbs waves RCS. be tuned between passband band....

Adequacy of food supply has a significant effect on the sex ratio juvenile sea lampreys, which also adjusts to changes in external environment, influenced by resource availability, position web, and ecological niche. Therefore, it is necessary pay attention effects lampreys' ecosystem interactions. In this paper, we constructed an model. We comprehensively analysed impacts lamprey's from four dimensions logistic equation population dynamics model, web spatio-temporal model1,2,3. The study...

In this paper we present a combined probability estimation approach to detect and track multiple people for pose at the same time. It can deal with partial total occlusion between persons by adding torso appearance tracker. Moreover, upper body of each individual is further segmented into head, torso, arm lower in hierarchical way. The simplicity feature simplified model allow close real time performance experimental results show that proposed method most inner-occlusion persons, as well...

Since complementary media was proposed, it is widely used in electromagnetic cloaking. In this work, we realize some other optical devices that deal with wavefronts transformations media, which have obvious advantages over traditional ones. More importantly, devise a novel-shape transformer can create an illusion source to prevent the real from being detected accurately. Some of these develop be realized isotropic and homogenous materials. Influence loss on performance also explored....

A miniaturized dual-band frequency selective surface (FSS) is proposed in this letter. The FSS unit cell composed of meander lines arranged spirally, and produces resonant frequencies 1.42 GHz 3.76 with -3 dB bandwidths 0.95 0.49 GHz. equivalent circuit model introduced to explain the performance. at top bottom layers are connected through copper vias increase inductance capacitance cell. dimension 10 mm, which about 4.7% wavelength first frequency. Simulation results show that can work...

A high order finite-different time-domain methods using Taylor series expansion for solving time-dependent Schrodinger equation has been systematically discussed in this paper. Numerical characteristics have investigated of the schemes equation. Compared with standard Yee FDTD scheme, numerical dispersion decreased and convergence improved. The general update equations presented wave function. results potential well one-dimension show that application is more effective than Yee’s method...

In the last decade, computer vision has drawn more and attention because of its potential applications in our daily lives, such as health care, education, safety, training. However high complexity many vision-based approaches hinders their practical applications, especially where immediate feedback is required. This thesis focuses on developing fast robust algorithms to track multiple people a scene, which can be used like interactive crisis analysis, serious games, or virtual reality. We...

This article has been retracted by the publisher.

In the millimeter wave wireless communication system, frequency source is an indispensable device in equipment. It designed to provide a local oscillator signal for receiving and transmitting system. Its tuning range, phase noise stability are very important quality of whole link. For this purpose, paper studies low power voltage controlled based on CMOS technology, designs Q band used Q- LINKPAN standard. Firstly, (VCO) circuit structure, circuit, cross coupled pair, on-chip inductor...