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In this paper, micro (mean size is 1 ) and nano (mean size is 10 nm) (Titania) were loaded into epoxy resin at the same time. Eleven kinds of samples with different filler contents were prepared. Flashover characteristics of the epoxy composites were investigated under 50 ns (rise time)/1.5 (half-height width time) unipolar pulse and ...
Micro TiO2 and Al2O3·3H2O fillers were loaded into the epoxy resin by mixing different weight ratio. The flashover studies were conducted using 20 ns (rise time)/1.5 μm (half-height width time) pulse under 5 × 10-3Pa vacuum. The surface flashover properties of micro TiO2 and Al2O3·3H2O/epoxy composites were presented. In addition, their dielectric spectrum and thermally stimulated depolarization current...
A two-component composite material is simulated by 8times8times8 cubic cells, containing a spherical inclusion in each of them. A series of produced random numbers are regarded as the radii of these spherical inclusions to simulate the size distribution of inclusions. The finite element method (FEM) is applied to solve the potential distribution and the effective permittivity is calculated by the...
A simulation for dielectric constant of two-phase disordered composites based on a three-dimensional disordered model is presented. In this model, the inclusions can be arranged at random positions in a composite material that is simulated by 10times10times10 cubic cells. Under the quasi-static approximation, numerical calculations are performed using the finite element method (FEM). In order to get...
This paper describes a GPS antenna array that is able to reject jamming signals from two different directions. The GPS array consists of five antenna elements of equal amplitude and different phases. The 5-element GPS array can produce two nulls using the phase-only technique. Ceramic substrate of high dielectric constant is used to realize a miniaturized GPS antenna element. Due to the narrow bandwidth...
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