Materials Literature
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We present here the characterization of a 1-bit linearly-polarized reconfigurable 20×20-element transmitarray operating in X-band with a reduced focal distance. The array is illuminated by four 10-dBi horns excited in phase and whose positions have been optimized; this leads to a 45% reduction of the focal distance. T…
Summary Manufacture of composite barrier X‐Ray radiation has been carried out by mixing Elastomer Thermoplastic‐Methyl Metacrylate (ETP‐MMA) with Pb3O4. The study was conducted with four variations: the variation of used rubber materials; the variation of rubber filler material composition; the variation of composite…
Polarization, charge transport, breakdown, space charge and other electrical phenomena have been studied under a quantum level. Several theories and codes based on Schrodinger equation have been applied. However, there are inevitable defects in these methods, e.g. excessive simplification, which is not reasonable when…
This study analyzes the low-frequency dielectric and dynamic mechanical properties of the cross-linked polyethylene XLPE material from the inner, middle, and outer insulating layers with different operational years. The fourier transform infrared reflectance spectroscopy, thermogravimetric analysis, and differential s…
On-line partial discharge (PD) measurement is now widely applied to motors rated 6 kV and above that are fed from the 50/60 Hz power system. However, during the past several years, many motors are being powered from inverters which facilitate variable speed motors to improve process efficiencies. One of the drives now…
In this paper, a statistical approach for evaluating the transformer's paper insulation is proposed. The proposed approach adopts multi-variable analysis to investigate the correlations between the degree of polymerization (DP) of paper insulation and increase rates of different dissolved gases in oil. Moisture in pap…
The distribution of electric field in cable insulation under DC field is introduced, the non-uniform radial field and space charge accumulation lead to the distortion of electric field in cable insulation, so it is important to investigate the distribution of space charge in model cable insulation. It is indicated tha…
Nonlinear metasurfaces based on coupling locally-enhanced plasmonic response to intersubband transitions of multi-quantum-wells have recently provided second-order susceptibilities several orders of magnitude larger than any other non-linear flat structure measured so far. Here, we demonstrate that a proper design of…
A novel reflectarray with two double-layer dipole arrays is presented. With a linearly-polarized feeder, the proposed reflectarray transforms the linearly-polarized incident wave into circularly-polarized one. A 20 × 20 element reflectarray operating at 24 GHz is designed and the simulated results show that a 1-dB gai…
In this paper, conductance characteristics of the two kinds of XLPE materials such as XLPE and XLPE/SiO2nano-composite were measured under high stresses (2–70kV/mm) and under different temperatures (e.g. 20°C, 50°C and 80°C), after both XLPE were treated through different thermal treatment methods including thermal tr…
A silver nanowire (AgNW) conductor embedded in a polydimethylsiloxane (PDMS) elastomeric substrate forms a microstrip patch antenna that can sense an applied biaxial strain. The flexible conductor and substrate allow the antenna to be repeatedly deformed by applied force. The two resonant modes of the antenna respond…
Summary The development of multi‐walled carbon nanotube (MWCNT)‐epoxy nanocomposites, for structural polymeric composites, has various problems that could decrease their mechanical properties above 2 wt % of MWCNT. One of the major problems is the interface bonding between MWCNT and epoxy. In this research, functional…
A surface Bare polarization converter vias designed and fabricated. The structure conTerts the polarization of surface waves between pare TM and IE polarizations. The design was fabricated using printed circuit techniques, and it was composed of a solid ground plane and an etched top later of anisotropic metallic patt…
Since 750 kV transmission lines locate in the high altitude areas of northwest China where the environment condition is comparatively severe, the electromagnetic environmental problems in substations appear to be more prominent. As can be seen from the field observation results of the in-service substation, the freque…
A graphene-based single-pole double-throw (SPDT) switch is presented for mm-wave applications. The proposed SPDT switch is realized by mounting graphene layers on the slot of slotted substrate integrated waveguide (SSIW). Simulations show the designed switch achieves a frequency bandwidth from 59.5 GHz to 60.8 GHz wit…
A new-type of SF6gas-insulated HVDC wall bushing has been manufactured. The double-layer electrodes are introduced to grade electric fields instead of traditional capacitor foils. Therefore, the electric-field distribution of inner insulation is quite different from traditional productions as well as structure design.…
The attenuation characteristics of a partial discharge (PD) pulse propagating in a long-distance power cable is always a concern for PD detection. The high frequency attenuation of the symmetric PD pulse waveform has been previously well modeled, and the approximate solution concerning the asymmetric pulse has also be…
The accumulation of surface charge generated by discharge at the solid-gas interface is an import factor that can affect PD characteristics. In this paper, the decay time of surface charge was measured by the surface charge measurement system based on Pockels effect, and the effect of surface charge decay on variation…
A new polarization diversity converter (PDC) is presented in this paper based on a multilayer frequency selective surface (MFSS). The MFSS consists of three-layer square patches with truncated corners and two-layer grid lines. The converter is considered as a free-rotating screen. The polarization of the transmitted w…
Electrically small resonant scatterers have gained enormous popularity in the field of electromagnetics recently due to their pivotal role in metamaterial design. One of the fundamental physical limitations restricting the application of metamaterials is the inherent narrow bandwidth of the resonators. This paper demo…