Yevhen Yashchyshyn - Academia.edu (original) (raw)

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Papers by Yevhen Yashchyshyn

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne, 2009

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne, 2017

Materiały Ceramiczne /Ceramic Materials, 2012

In this paper we report the results of a study of microstructure and dielectric properties of cer... more In this paper we report the results of a study of microstructure and dielectric properties of ceramic-polymer composites composed of barium strontium titanate Ba0.5Sr0.5TiO3 (BST50/50), Ba0.6Sr0.4TiO2 (BST60/40), Ba0.7Sr0.3TiO3 (BST70/30) and polyvinylidene ? uoride (PVDF). The composites BST50/50//PVDF, BST60/40//PVDF and BST70/30//PVDF were obtained by the hot pressing method for volume fraction of BST ceramic powder cv = 1.47%, 3.04%, 4.75% and 6.6%. The morphology of BST50/50//PVDF, BST60/40//PVDF and BST70/30// PVDF composite powders and the composite microstructure was observed by transmission and scanning electron microscopy, respectively. Dielectric properties of the composites were measured by the impedance spectroscopy method. The split-post dielectric resonator (SPDR) was used for the measurements of the real and imaginary part of dielectric permittivity of the BST//PVDF composites in the microwave frequency range of f = 3-10 GHz.

IEEE Transactions on Microwave Theory and Techniques, 2023

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne, 2016

European Conference on Antennas and Propagation, Mar 1, 2019

In this paper, a novel mm-wave beam-steerable antenna with ferroelectric substructure is presente... more In this paper, a novel mm-wave beam-steerable antenna with ferroelectric substructure is presented. Ferroelectric substructure is placed under grounded substrate of antenna and coupled with it by three slots etched in internal metallic sheet. The radiation pattern control capability is demonstrated by varying the permittivity of the ferroelectric substructure. The proposed antenna is an excellent solution for a low-cost mm-wave beam-forming due to high radiation efficiency, high gain, low-profile, and low cost of fabrication.

Elektronika : konstrukcje, technologie, zastosowania, 2009

With recent increase of hardware capabilities, the application of sensor arrays in the Direction-... more With recent increase of hardware capabilities, the application of sensor arrays in the Direction-Of-Arrival estimation is gaining more and more popularity. The behaviour of the array is the complex function of the geometry, sensor characteristic, signal and noise properties and other different factors. Before building the array it is essential to simulate its performance in different conditions with different algorithms. Most of the time the simulations are performed using custom ad-hoc created code. This code is error prone and difficult to maintain. Our goal was to create a reusable and extensible library that would provide the components used in the simulation process. In this paper we present the initial version of the library along with several illustrative examples.

In this paper the results of full-wave electromagnetic modeling of RF transducer for acousto-opti... more In this paper the results of full-wave electromagnetic modeling of RF transducer for acousto-optic modulator are presented. They show that inclusion only the electromagnetic properties for designing the optoelectronic devices is not satisfying. For this reason, designing process of the optimal (from the acousto-optic point of view) construction of the modulator with RF transducer should include two stages. The first stage has to be based on the acousto-optic requirements. The second stage has to be related to the optimization of the electromagnetic parameters taking into account the results of the first stage.

Bismuth silicon oxide (Bi12SiO20, BSO) is a material having wide range of applications in optical... more Bismuth silicon oxide (Bi12SiO20, BSO) is a material having wide range of applications in optical technology, electronics, and microwave techniques. An application in sub-THz devices is also prospective. In view of the foregoing, the electrical parameters of a single-crystal BSO were examined in this work in the 220–325 GHz frequency range. The influence of UV radiation on the transmission of waves through the material was also subjected to an experimental study. The results can contribute to the development of future BSO based sub-THz devices.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne, 2018

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne, 2010

European Microwave Conference, Dec 23, 2013

ABSTRACT A novel type of an absorbing panel made of a cross-like resistive pattern, with a pitch ... more ABSTRACT A novel type of an absorbing panel made of a cross-like resistive pattern, with a pitch much smaller than an operating wavelength, deposited on a dielectric spacer covering a conducting surface, is proposed in this paper. An appropriate choice of the shape and resistance per square of the pattern allows extending an absorbing spectrum up to an octave, which is very competitive over alternative solutions, similar in shape, but made of metallic patterns. The pattern is made of a printing ink with graphene nanoplatelets, what makes the mixture conducting at a low volume fraction of inclusions.

ABSTRACT Paper concerns the applicability of the antennas' pulse response in the ultra-wi... more ABSTRACT Paper concerns the applicability of the antennas' pulse response in the ultra-wideband systems. It provides information, why it is important to determine this parameter and describes simple measurement procedure. Measurement results for selected exemplary antennas are also given.

This work presents the design of reconfigurable antenna based on a leaky-wave microstrip line ope... more This work presents the design of reconfigurable antenna based on a leaky-wave microstrip line operating on a higher order mode. The antenna structure comprises a set of discrete PIN diodes, modeled in electromagnetic simulation by its equivalent circuit. Relation between the number of diodes and antenna performance is discussed in details

12th International Conference on Microwaves and Radar. MIKON-98. Conference Proceedings (IEEE Cat. No.98EX195), Nov 27, 2002

The results of design and investigations of elliptically polarized millimeter wave antenna arrays... more The results of design and investigations of elliptically polarized millimeter wave antenna arrays are shown. A presented leaky-wave antenna array consists of the waveguide structure and a finite diffraction grating. The diffraction grating is excited by an E-type surface wave, which is the eigenwave of the waveguide structure. The diffraction grating consist of rectilinear and parallel nonhomogeneities, which are disposed at an angle of /spl alpha/ in the direction of surface wave propagation. The angle /spl alpha/, widths and distances between nonhomogeneities are chosen by using special optimization algorithms in order to obtain the necessary electrodynamic characteristics.

Results of design and investigations of elliptically polarized millimeter wave antenna arrays are... more Results of design and investigations of elliptically polarized millimeter wave antenna arrays are shown. A presented leaky-wave antenna arrays consist of the waveguide structure and finite diffraction grating. The diffraction grating is excited by E type surface wave, which is the eigen wave of the waveguide structure. The diffraction grating consist of rectilinear and parallel nonhomogeneities, which are disposed at an angle of a in the direction of surface wave propagation. The angle a widths and distances between nonhomogeneities are choosing by using special optimization algorithms in order to receive necessary electrodynamics characteristics.