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Analytical expressions of the electrokinetic potential for cylindrical and spheroidal particles were obtained. It was shown that the electrokinetic potential of cylindrical and spheroidal particles is determined by the function, which depends only on the aspect ratio. Dependencies of the electrokinetic potential for cylindrical and spheroidal particles on the aspect ratio were calculated.
An electrically tuned antenna for mobile handsets working in four low and one high LTE frequency bands is described. The PIFA-type antenna contains high and low-frequency branches. A tuning element is connected to the low-frequency branch. The proposed antenna operates at one of low-frequency bands depending on state of the tuning element, keeping tuning on the high-frequency band. A varactor and...
The reference ultra-wideband (UWB) planar antenna was designed as a circular metallic patch fed by a coplanar waveguide structure (CPW). This antenna provides a stable radiation pattern and impedance bandwidth of the wideband response from 2.5 GHz to 12 GHz. To achieve the band-notched characteristics at desirable frequencies, the electric ring resonator (ERR) is proposed to use in the planar configuration...
Degradation process of metallized film capacitors under high electrodynamic load was investigated. Pulse current overload factor exceeded 40. The polar effect of contact edges destruction was found. The average lifetime of different metallized film capacitors in pulse mode was evaluated. Dielectric frequency response testing during a capacitor's degradation was performed. Obtained spectra contain...
The power transmission line (TL) designer is faced with the problem of the possible corona discharge firing voltage assessment on the basis of the simple relationships, the designer should have the clear idea of the basic characteristics of the corona discharge, their dependences on the wire design and the bundle availability as well as the mutual influence of the present parameters. The model of...
This paper contains results of theoretical and experimental research of time domain reflectometry approach for determine IC's component parameters. Experimental results are provided and show possibility for inductance and capacitance measurement up to 25GHz. Measurements contains result of signal path research on IC and printed circuit board (PCB) used for 12GHz RF chips. Also dielectric constant...
The scheme and the parameters of the generator pulse currents, simulating actual flowing currents on wind turbine blades are presented. The form and duration of these pulses are considerably different from the standard. The results of experiments on the action of current pulses to the material of the blades are shown. Measures to increase the lightning-resistant of wind generators are suggested.
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