Search Results - "Poplavko, Y.M."

Spontaneous Polarization or Manifestation of Peculiar Internal Structure? by Poplavko, Y.M., Didenko, Y.V.

“…Not only new terminology is suggested, but substantially different approach to pyro-, piezo- and ferroelectric crystals behaviour understanding. As a rule,…”
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Negative Thermal Expansion Coefficient by Poplavko, Y.M., Didenko, Y.V., Yakimenko, Y.I.

“…Physical nature of negative thermal expansion coefficient (α) in polar-sensitive dielectrics and semiconductors is explained. Physical features of inter-atomic…”
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Features of Polar Crystals Electrical Polarization by Poplavko, Y.M., Yakimenko, Y.I., Didenko, Y.V.

“…Unique properties of polar crystals, in particular, pyroelectricity, are described by a new representation, which expands and refines the widely used concept…”
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The nature of large dielectric constant of relaxors by Poplavko, Y.M.

“…Relaxors are used as non-hysteresis (electrostrictive) actuator materials applied in micromechanics and as microdrivers for microwave mechanically tunable…”
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Microwaves in Ukraine by Nosich, A.I., Poplavko, Y.M., Vavriv, D.M., Yanovsky, F.J.

“…This review looks at the history and present state of microwaves in the Ukraine, showing that this area is well developed and has great potential. The…”
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Ferroelectric film examination at microwaves by Poplavko, Y.M.

“…Various methods of microwave measurement of thin dielectric film with large dielectric permittivity (epsiv~10 2 -10 4 ) and increased loss (tandelta~10 -2 -1)…”
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Quartz temperature and pressure sensors by Poplavko, Y.M., Pereverzeva, L.P.

“…Pyroelectric effect as well as volumetric piezoeffect are vectorial responses on scalar influences that usually are possible only in the crystals which…”
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MEMS-Like Phase Shifter with Piezoelectric Control by Poplavko, Y.M., Golubeva, I.P., Prokopenko, Y.V.

“…This paper presents an attempt to realize control over effective parameters of transmission line utilising design suitable for MEMS applications. Proposed…”
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The nature of dielectric permittivity electric control at microwaves by Poplavko, Y.M.

“…The control of dielectric permittivity (/spl epsiv/) by the bias electric field (E/sub b/) at microwaves, and its application in a phase shifter has 40-year…”
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Microwave structures electromecanical reconfiguration for tunable devices elaboration by Poplavko, Y.M., Prokopenko, Y.V., Furman, E., Lanagan, M.

“…Various highly tunable low-loss microwave devices are elaborated by piezoelectrically induced mechanical changes in the microwave structures utilizing high Q…”
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Ferroelectrics as microwave absorbent packaging by Pereverzeva, L.P., Poplavko, Y.M., Young Soo You

“…Microwave dielectric dispersion in ferroelectrics covers the 1-100 GHz frequency range, so ferroelectric ceramic powder can be used as the main component of a…”
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Influence of absorber termination quality in the GTEM cell on the RF radiation measurement by Prokopenko, Y.V., Poplavko, Y.M., Shevchuk, A.M., Bahtina, N.

“…The calibration technique for the RF radiation measurement in GTEM cell is elaborated. The technique takes into account real reflection from non-ideal absorber…”
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Piezo-controlled microwave passive devices by Poplavko, Y.M., Moongi Jeong, Sunggi Baik

“…New modification of piezoelectric manner of microwave filters frequency control, as well as, the possibility to create phase shifter at microwaves/millimeter…”
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Microwave dielectric resonator frequency control by Poplavko, Y.M., Prokopenko, Y.V., Molchanov, V.I., Tatarchuk, D.D.

“…Constituent dielectric resonators and dielectric-metal mirror resonant structures capable of electrically controlling frequency with a preservation of high…”
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Temperature compensation of dielectric resonator frequency by Pashkov, V.M., Molchanov, V.I., Poplavko, Y.M.

“…A new way for the thermal compensation of dielectric resonators (DR) is proposed for the DR made of high-quality, but not thermally stable, materials. Thermal…”
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Thermal stable microwave dielectrics by Young Soo You, Poplavko, Y.M.

“…Thermally stable high dielectric constant ceramics are used in microwave technology as dielectric resonators, filters, microwave substrates, waveguides and…”
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TEM cell electromagnetic field simulation by Kim, Y.D., Prokopenko, Y.V., Poplavko, Y.M.

“…The main advantage of the developed software is the possibility to solve the electromagnetic field problem in the case of complicated shapes of shield and…”
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Pyrotransistor-GaAs FET with a "pyroelectric wafer" gate by Poplavko, Y.M., Moskalyuk, V.A., Timofeyev, A.I., Prokopenko, Y.V.

“…The multifunction properties of GaAs and other III-V semi-insulating crystals can be expanded by the artificial decreasing of their electric response symmetry…”
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Application of new thermopiezoelectric effect to thermo- and piezoelectret records by Poplavko, Y.M., Otkox, A.I., Krainyk, G.G., Pereverzeva, L.P.

“…It was originally shown that partially clamped piezoelectric crystals decrease the symmetry of their polarization response to thermal or elastic excitation. As…”
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Frequency agile microwave dielectric components integrated with high-speed piezoelectric actuator by Poplavko, Y.M., Prokopenko, Y.V., Kazmirenko, V.A., Moongi Jeong, Sunggi Baik

“…Low loss highly tunable microwave material can be fabricated using dielectric laminate structure in which effective dielectric constant /spl epsiv//sub ef/ is…”
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