Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Spartak Gevorgian"'
Autor:
Arshak Poghossian, Samvel Shoukourian, Vardan Mkrttchian, Vladik A. Avetisov, Spartak Gevorgian, Ruben Vardanyan, Ferdinand Gasparyan
Student competence includes process of the organization, transfer and assimilation of knowledge, skills of activity. Educational processes (or otherwise, training process) are connected with development of training in time and space and mean consecut
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5d1b854c72bf7471f0c5ec293005b67
https://doi.org/10.4018/978-1-5225-3485-3.ch001
https://doi.org/10.4018/978-1-5225-3485-3.ch001
In this article, the effect of Mn doping on the permittivity and dielectric loss in 0.67BiFeO3-0.33BaTiO3 (BF-BT) based film bulk acoustic resonator test structures has been investigated. BF-BT thin films were deposited on the fused silica substrates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7818bd56aead0fce881c2c24988e9db6
https://hdl.handle.net/10576/17168
https://hdl.handle.net/10576/17168
Autor:
Andrei, Vorobiev, Spartak, Gevorgian
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 61:840-848
Experiment-based analysis of losses in tunable ferroelectric xBiFeO3-(1-x)BaTiO3 (BF-BT) film bulk acoustic wave resonators (FBARs) is reported. The Q-factors, effective coupling coefficients, and tunabilities are considered as functions of surface r
Autor:
Spartak Gevorgian, Andrei Vorobiev
Publikováno v:
International Journal of Microwave and Wireless Technologies. 5:361-369
Emerging intrinsically tunable film bulk acoustic wave(BAW) resonators allow the development of new generation reconfigurable and agile microwave circuits. In this paper, we demonstrate the enhancement of tunable performance of the high Q-factor BaxS
Autor:
Spartak Gevorgian, Andrei Vorobiev
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 60:795-804
A closed-form analytic formula is derived for composite resonators consisting of two layers of paraelectricphase ferroelectrics. It is used to analyze the properties of these resonators. Under an applied dc electric field, the layers exhibit an induc
Publikováno v:
Thin Solid Films. 520:4470-4474
We have studied the dependence of dielectric properties on the deposition temperature of BiFeO3 thin films grown by the pulsed laser deposition technique. Thin films have been grown onto amorphous silica glass substrates with pre-patterned Au in-plan
Publikováno v:
Integrated Ferroelectrics. 134:111-117
Dielectric response of the BiFeO3 films in a parallel-plate capacitor configuration is studied in the frequency range 1 MHz-30 GHz and under dc electric field up to 45 V/mu m in view of their application in tunable film bulk acoustic wave resonators.
Autor:
Spartak Gevorgian, Andrei Vorobiev
Publikováno v:
Integrated Ferroelectrics. 134:75-80
ADS based Mason circuit model of solidly mounted FBARs is proposed where coexistence of both thickness mode longitudinal and shearwaves is assumed. While calculating the leakage of longitudinal and shear waves into the substrate via Bragg reflector t
Autor:
Spartak Gevorgian, John Berge
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 58:2768-2771
A switchable and tunable bulk acoustic wave resonator based on a paraelectric phase Ba0.25Sr0.75TiO3 thin film and an all-dielectric HfO2/SiO2 Bragg reflector is presented. The achieved tuning range (3.8%) and effective electromechanical coupling coe
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 58:1475-1484
The extremely high permittivity of ferroelectric varactors (typically ϵr > 100) imposes specific design and fabrication constraints for microwave and millimeter-wave applications. In this paper, small-size parallel-plate ferroelectric varactors inse