Materials Literature
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A electrical small antenna using a novel finger-connected interdigital capacitor (FC-IDC), based on composite right/left handed (CRLH) unit cell, is proposed in this paper. The proposed CRLH antenna consists of a thin rectangle substrate integrated waveguide (SIW) cavity with the etched interdigital slot on the top me…
In this paper, A Fabry-Perot (FP) cavity antenna based on coding metasurface is addressed to realize a four-point focused hologram. A three-layer partial reflection surface (PRS) unit is designed by fixing the reflective phase to generate plane wave and arranging the transmission phase combined with the weight Gerchbe…
In this paper, a novel multi-layer unit cell is proposed for the transmitarray (TA) application. The proposed multi-layer unit cell is composed of a H-shaped patch in the middle with three-dipoles around it. The transmitting phase of the proposed element in x- and y-polarization is controlled by two different structur…
In this paper, two novel Artificial Magnetic Conductor (AMC) structures, based on circular loop patch and substrate, are designed to realize 180o reflection phase difference in a wide frequency band. These two AMCs’ reflection phase property is applied to redirect the scattering fields of a radar target to reduce its…
The design of high quality factor (Q-factor) resonator requires consideration of thermoelastic damping (TED), which is an internal energy dissipation mechanism and determines the upper limit of the Q-factor. The previous works of TED models for microbeams mainly focus on the microbeams with rectangular or circular cro…
Today, the emergence of new technical means of monitoring the state of the environment based on modern approaches in the field of microcontroller technology is a tendency. First, it is necessary to emphasize the peculiarity of reducing the level of energy consumption for this type of devices, improving the quality of…
In this work, the dispersed phase holdup in a Kühni extraction column is predicted using intelligent methods and a new empirical correlation. Intelligent techniques, including multilayer perceptron and radial basis functions network are used in the prediction of the dispersed phase holdup. To design the network struct…
Hollow-shape colloidal Cu2ZnSnSe4 nanocrystals were successfully synthesized in this study using hot-injection method. TEM, XRD, Raman, XPS, UV-Vis-NIR, and photo response measurements were carried out to characterize the hollow nanocrystals. These hollow nanocrystals were found to have tetragonal structure and high c…
These In this paper, a new frequency-selective rasorber (FSR) with the performance of high-frequency transmission and low-frequency absorption is proposed. The structure is composed of a band-pass frequency selective surface (FSS), an air layer and a resistance FSS. The design idea of the hexagonal impedance surface i…
A novel tunable metamaterial split ring resonator acts as perfect absorber at dual band of frequency at GHz range is being demonstrated in this paper. It is absorbed that the proposed metamaterial acts as perfect absorber around 15 GHz and 32.5 GHz with absorption coefficient of 97% at lower band frequency and 91.3% a…
In this paper, a multi-bit all-dielectric reflective metasurface is presented for EM wave manipulation. The top layer of propped metasurface consists of high index material. The unit cell is designed to act as a 1-, 2-, and 3-bit metasurface to attain better control of EM waves. For 3-bit metasurface, the eight digita…
In order to further improve the reliability of the transformer winding state detection, a method for analyzing winding state is proposed by using winding oscillation wave. The oscillation wave is obtained from the transient excitation generated by switching’s action under high voltage direct current (HVDC). Based on t…
in this paper, electronically controlled high pressure common rail diesel engine is taken as the research model, and the effect of post-injection parameters (main to post-injection angle and proportion of fuel injection), post-injection timing and exhaust-gas recirculation (EGR) on engine energy distribution and emiss…
In this paper, we have proposed a wideband transmissive type linear to circular polarization converter from 1.02 THz to 1.48 THz based on metasurfaces. The proposed unit cell is bi-layered with a dielectric spacer sandwiched in between metasurfaces. Simulation results show that the proposed structure is able to conver…
Free-space optical communication systems operate with very limited field of view and in narrow spectral regions, leading to relatively simple optical designs. Operation in the space environment, however, imposes severe environmental requirements. Typically mounted on the exterior of a spacecraft, the optical component…
As a new two-dimensional material, graphene has been applied in various devices due to its unique electrical and optical properties. In this work, a reconfigurable Yagi antenna by using graphene’s tunable conductivity is proposed. The Yagi antenna consists of one feed element and four elements which are located on eit…
This paper presents the research achievements for the optomechanical metamaterials and metasurfaces in our group at the past several years. Firstly, the analysis for mechanical motion under the electromagnetic (EM) wave excitation of a metamaterial unit cell is developed, and the interaction between the EM wave and me…
In this work, we present a high aperture efficiency wideband True-Time-Delay transmitarray antenna based on coding metasurface. For wideband aperture coupling antenna, the True-Time-Delay(TTD) compensation method can obtain better performance than the phase compensation method, including gain, aperture efficiency and…
The necessary components to reduce the wide Angle beam scanning antenna, leaky wave antenna scanning Angle at the same time maximize the cycle, reduce the cost of materials, this paper find a new kind of liquid crystal materials, application on the design of liquid crystal planar periodic leaky wave antenna. The anten…
we proposed a planar terahertz metasurfaces composed of asymmetric split rings resonators on polyimide substrate. Simulation results show that three resonances are observed in the transmission spectrum, and stronger toroidal dipole resonances are obtained at 0.29 THz and 1.25THz. The electromagnetic characteristics wo…