Materials Literature
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A novel flat lens based on metamaterials is presented in this paper. The metamaterial lens is composed of metallic lattice and squared metal patch, which can find significant gain enhancement by 3.5 dB between 1.30 GHz and 1.35 GHz without affecting the reflection coefficient of the antenna. The lens enables electroma…
The calculation process of the design calculation of the centrifuge structure is proposed, and the finite element analysis and calculation of the typical components of the centrifuge are carried out, and the optimization analysis of the structural design is realized. The corresponding modal analysis calculation proces…
A miniaturized dual-polarization frequency selective rasorber (FSR) with meandering structure is proposed, which express a transmission window between two absorption bands. The FSR consists of a lossless layer and a lossy layer. The lossy layer is a folded cross fractal structure that four resistive sheets are loaded…
Because of their unique and excellent properties, gold nanoparticles (GNPs) have been widely used in biological monitoring, cosmetics and clinical fields. In this study, PEG200, as a component, and ascorbic acid, as a reducing agent, were used to develop a rapid one-step method for GNPs synthesis at room temperature.…
The FDTD methods combined with Surface Susceptibility Model (FDTD-SSM), compared to traditional brute force metasurface simulation, have been proved efficient and accurate for fast metasurface analysis. However, the present work is limited to scattering elements that are either isotropic or that have diagonal surface…
In this study, to obtain a more accurate analysis of the temperature in microwave coagulation therapy (MCT) for hepatocellular carcinoma, the water content rations of liver tissue during the heating and the dependencies of the dielectric and thermal constants of the tissue on the water content ratios were investigated…
A design of a circular polarized corrugated horn feed for reflectarray antenna.The feed is composed of corrugated horn, rectangle-circle supporting structure, septum polarizer and standard waveguide converter. The simulation results show that the reflection coefficient is lower than -20 dB in the frequency range of 32…
In this paper, a single layered anisotropic high efficient multiband cross- and circular polarizer is modeled and analyzed. The unit cell of the proposed anisotropic metasurface contains a curved double-head anchors. The metasurface gives linear to linear polarization conversion (cross-polarization) with in frequency…
A slot array antenna with low radar cross section (RCS) is proposed by using a hybrid metasurface (HM) consisting of an anisotropic frequency selective absorber (AFSA) and a polarization rotation reflective surface (PRRS). Both the co-polarized and cross-polarized monostatic RCSs of the proposed antenna is significant…
A novel 12 × 12 digital reconfigurable reflectarray (RRA) antenna is designed using an aperture-coupled microstrip patch structure to realize high gain beam scanning. With the PIN diode ON and OFF, Phase difference within 180° ± 20° of each reflectarray element is realized from 8.4 to 9.2 GHz. Utilizing this 1-bit ele…
It is of great significance to study the factors affecting the geomagnetically induced current (GIC) for evaluating the influence of geomagnetic storms on the stable operation of power system. The magnitude of the GIC is related to many factors, among which the location of land and sea is very important. In order to s…
An integrative design approach of reflective metasurface and microstrip antenna is proposed to reduce the radar cross section (RCS) of microstrip antenna and keep the radiation performance simultaneously. To illustrate this approach, a novel metasurface antenna is presented. The results reveal that the metasurface ant…
This paper analyzed the distribution of permanent magnet (PM) eddy current loss by theoretical method firstly. When the distribution of PM eddy current loss is accounted for thermal field calculation, it shows good agreement between the calculation result and test. Further, different segmentation methods in axial dire…
Research and development in the field of environmental engineering technologies is expanding with an increasing interest in environmental protection, with which the closely related materials are used in the production and operation of frequently used industrial machinery and equipment. Such materials also include magn…
Partial discharge refers to a discharge phenomenon in which a portion of a region is discharged due to an electric field and there is no breakdown between the applied voltage conductors in an operating state. For transformers above 110kV, the partial discharge test is an effective means and method for verifying the in…
In this paper, we summarize the latest discoveries on glide symmetry for electromagnetic devices. Glide symmetries have demonstrated the ability to improve the response of conventional periodic structures. In particular, they have been proposed to increase the bandwidth and isotropy of unit cells, which can be used fo…
In this work, a wideband and high gain millimeter wave array antenna based on highly conductive graphene film is designed, fabricated and tested. The proposed antenna consists of 4×4 radiation patches and a Chebyshev feed network, which are made of highly conductive multilayer graphene film with light weight and low c…
The phenomenon of electromagnetic induced transparency (EIT) based on graphene in microwave band has seldom been studied due to its shortcomings in frequency modulation in this band. However, based on the excellent tunability of graphene, EIT with adjustable amplitude in microwave frequency band is still applicable. I…
Pancharatnam-Berry (PB) metasurfaces are capable of flexibly tailoring circularly polarized waves but still limited to the phase-only control. Here, we present a new strategy for realizing simultaneous amplitude and phase control of circularly polarized waves by combining propagation phase and the PB counterpart. As a…
Pressed steel sheets, in this case compacted vehicle bodies represent the structure diversity of the non-homogeneous material. There is necessity to determine the shear strength for the development of the construction of new processing equipment (cutting) of steel sheets. To calculate the shear strength it is necessar…