In the paper the interaction of surface acoustic waves (SAWs) with reflectors and interdigital transducers (IDTs) with high aspect ratio electrodes (HAR-electrodes) are investigated. The conditions for the SAW resonant reflection and propagation and the effective IDT conversion of the SAW power into electrical power at the load have been obtained. The real possibility of the effective SAW devices creation (filters, delay lines, resonators, RFID tags) at frequencies above 6 GHz (up to 12-15 GHz) using HAR-electrodes was demonstrated.

The causes of acoustic noise occurring during braking of electric vehicles, in particular, in the metro, were analyzed. The spectrum of such noise was measured, and it is shown that high-frequency discrete tones are excited by braking resistors, applied for electrodynamic braking of electric vehicles. Three proposed mechanisms of electromechanical interaction in a Fecral plate, which is a braking resistor element, were considered: the Ampère force and linear and nonlinear magnetostriction. It was shown that predominant odd harmonics indicate the presence of a significant piezomagnetic effect and the inverse effect of linear magnetostriction in the Fecral alloy. A phenomenological approach was used to calculate the piezomagnetic tensor elements for Fecral. Calculations by the finite element method showed that asymmetric cuts introduced into the plate may significantly decrease intensity of acoustic vibrations excited by the braking resistor.

A pulse wave is a complex joint motion of blood and vessel walls described by a nonlinear system of differential equations of hydrodynamics and elasticity theory with a mobile boundary. Even an approximate solution to such a problem is currently not possible without significant simplifications, reducing the problem to almost uninteresting cases. Therefore, to mathematically describe the practically important changes in the pulse wave between the norm and pathology and to identify the main physical parameters that characterize the pathology, it is necessary to build a phenomenological model, the parameters of which are determined from comparison with the experiment.The results obtained indicate that the pulse wave transformation in the cuff area is significantly nonlinear in pressure. Attention is also drawn to the effect of a decrease in the elastic modulus with an increase in the diameter of the vessel.

The concept of constructing of a radio frequency identification system at frequencies 6 GHz based on frequency coding using radio frequency identification tags on resonators on bulk acoustic waves with high Q factor is presented. The axially symmetric 3D structure of the film piezoelectric resonator with the quasi-single-crystal AlN film on the acoustic Bragg reflector which is formed from the alternating molybdenum and silicon oxide layers was considered. Optimization of the acoustoelectronic FBAR resonator design for the RFID tag in the frequency band 10–13 GHz was accomplished. The dependence of the top electrode thickness upon the required resonant frequency of the FBAR resonator was obtained. Design of the RFID tag in the frequency band 10–13 GHz was proposed. There are real technical possibilities for creating of the RFID system in the frequency band 6–30 GHz with the FBAR resonators. Such systems will be protected to electromagnetic fields and ionizing radiation and they will have the high temperature stability characteristic of the FBAR resonators.

Novel method of the anticollision problem solution in radio frequency identification systems was proposed. It allows to accomplish an unlimited anticollision. The identification of objects is based on using of multiband radio frequency identification tags with time discrete coding, on the introduction of an extended code position, on the application of the multilateration method and the multi-antenna receiving system. The implementation of this method allows the simultaneous identification of an unlimited number of objects, which are marked by radio frequency identification tags, in real time. The method can be implemented in systems using radio frequency identification tags both on surface acoustic waves and on integrated circuits.

Lamb wave excitation by the wedge-shaped ultrasonic phase array transducer was investigated by the finite element (FEM) method. Maps of the excitation efficiency were obtained for the plates of three different types of glass. Get maps effectiveness of excitation of Lamb waves. The conditions for preferential excitation of one mode of Lamb. Influences of three different liquid layers and the dependence of the aperture of the transducer were investigated.

The theoretical and experimental results of the design of new multiband radio frequency identification tags on surface acoustic waves in the frequency range 860-960 MHz were obtained. The tag contains three interdigital transducer, combined into a single microwave line. The necessity of using the multi-interdigital transducers is shown. The possibility of synchronous detection of up to a million tags from a distance up to 20 m was demonstrated experimentally. Localization region of such tags is up to 5 m. Miniature sizes of this tag allows its wide application in logistics, aerospace and manufacturing.

Effect of time delay with respect to electromagnetic channel for identified group of distant objects on recognition of anticollision radio-frequency tags based on surface acoustic waves is analyzed. An extended code zone is proposed to improve identification reliability under limitations on the localization region of tags.

The impact of high-frequency (1.2 MHz) ultrasound with a power density of 0.33 W cm(-2) on microcapsule nanocomposite shells with embedded zinc oxide nanoparticles was investigated by exploring modeling simulations and direct visualization. For the first time the sonication effect has been monitored in situ on individual microcapsules upon exposure of their aqueous suspension to ultrasound. The stress distribution on the microcapsule shell for the impact of ultrasound with high (1.2 MHz) and low (20 kHz) frequency at two fixed intensities (0.33 and 30 W cm(-2)) has been modeled. As shown in silico and experimentally the nanocomposite microcapsules were destroyed more effectively by the action of high-frequency (1.2 MHz) ultrasound in comparison to the low frequency (20 kHz) one with the same power density.

A new modification of the quasi-field method for calculation of surface acoustic wave devices, which eliminates the necessity of the only phenomenological parameter, is suggested. The structures of radio-frequency identification tags in the microwave band calculated by the quasi-field method and finite-element method are compared and found to be in almost full agreement. Frequency and time characteristics of tags, including autoand cross-correlation signals of tags used for simultaneous recognition of numerous tags in anti-collision schemes, are calculated.

A new modification of a quasi-field method for calculating the characteristics of surface acoustic wave devices using no phenomenological parameters is proposed. Calculated and experimental data for a delay line based on lithium niobate with a nickel electrode are compared. It is shown that the amplitude frequency characteristics and time responses are in good agreement.

A SAW radio-frequency identification (RFID) tag has been investigated theoretically and experimentally in the 6-GHz frequency band. In the calculations, the finite thickness of the electrodes, the difference between the acoustic properties of thin-film and bulk aluminum, and the bulk scattering of the SAW energy by the electrodes are taken into account. The computed test RFID tag (with equidistant arrangement of signal reflectors) has been manufactured with the use of electron-beam lithography. It is shown that the measured and calculated RFID-tag time responses to the interrogating pulse are in good agreement and the code-pulse loss level is 50–55 dB.