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| 2. |
- Turalchuk, Pavel, et al.
(author)
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Electrically tunable bulk acoustic filters with induced piezoelectric effect in BSTO film
- 2008
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In: 38th European Microwave Conference, EuMC 2008; Amsterdam; Netherlands; 27 October 2008 through 31 October 2008. - 9782874870064 ; , s. 1695-1698
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Conference paper (peer-reviewed)abstract
- In this paper we discuss a potential realizability of a tunable bulk acoustic filter based on BSTO film for microwave applications. The estimation of characteristics of the tunable TFBAR was done by processing the experimental data obtained for the BSTO resonator using the model of the induced piezoelectric effect. The third-order tunable TFBAR filter was designed. The necessary set of the acoustic and electric parameters of the tunable ferroelectric based TFBAR was proclaimed. The 10% tunability of the TFBAR filter pass band was estimated by a simulation. The simulated characteristics were obtained taking into consideration a real structure of the BSTO based resonators (electrodes and acoustic mirror).
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| 3. |
- Vendik, Irina, et al.
(author)
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CAD Model for Microstrips on r-cut Sapphire Substrates
- 1994
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In: International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering. - : Wiley. - 1050-1827 .- 1522-6301. ; 4:4, s. 374-383
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Journal article (peer-reviewed)abstract
- Simple and correct formulas are derived for calculation of an effective isotropic dielectric constant, which characterizes the wave propagation in microstrip lines on anisotropic substrates made of r-cut sapphire crystals. The r-plane is extensively used for epitaxial growth of high-Tc superconductor YBa2Cu3O7 films as applied to microwave integrated circuits. In contradistinction to previous models developed for z-cut sapphire, the nondiagonal dielectric permittivity tensor of r-cut sapphire is used. The effective dielectric constant of a microstrip line on r-cut sapphire substrate is found as a function of the strip-line geometry and the orientation of the crystallographic axes with respect to the symmetry plane of the microstrip line
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| 4. |
- Vendik, Irina, et al.
(author)
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Effective Dielectric Permittivity of r-Cut Sapphire Microstrip
- 1994
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In: Microwave Conference, 1994. 24th European. ; 1, s. 395 - 400
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Conference paper (peer-reviewed)abstract
- The effective dielectric constant of a microstrip is given as a function of the strip geometry and its orientation on the surface of the substrate. An "isotropized" dielectric constant is inroduced which can be used in commercial microwave software for simulation of r-cut sapphire substrate based micrstrip devices. Experimental velification of the analysis is also given.
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| 5. |
- Vendik, Irina, et al.
(author)
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Full-wave analysis of fundamental modes of a multicoupled strip line with ferroelectric film
- 2005
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In: Technical Physics Letters. - : Pleiades Publishing Ltd. - 1090-6533 .- 1063-7850. ; 31:1, s. 68-71
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Journal article (peer-reviewed)abstract
- The properties of a multicoupled microstrip line (MSL) with a thin control ferroelectric layer have been analyzed in terms of a full-wave model based on the method of moments in spectral domain. The Q values for all fundamental modes and their contributions to MSL losses are determined. It is established that various fundamental modes in multicoupled MSLs are characterized by significantly different Q values. The proposed method has been applied to the analysis of characteristics of an MSL-based ferroelectric microwave phase shifter. The figure of merit F of the phase shifter has been calculated for each fundamental mode. The results of analysis lead to a conclusion that, by exciting a fixed mode characterized by the maximum Q value, it is possible to obtain an MSL-based phase shifter possessing the optimum F at a minimum necessary level of the control voltage. © 2005 Pleiades Publishing, Inc.
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| 7. |
- Vendik, Irina, et al.
(author)
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Modeling tunable bulk acoustic resonators based on induced piezoelectric effect in BaTiO[sub 3] and Ba[sub 0.25]Sr[sub 0.75]TiO[sub 3] films
- 2008
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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 103:1, s. 014107-1-6-
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Journal article (peer-reviewed)abstract
- A model for tunable thin film bulk acoustic resonators (TFBARs) based on ferroelectric films is proposed. The model is based on electromechanical equations taking into account piezoelectric effect and electrostriction effect induced by the dc electric field. The dc field induced shift of the resonant frequency is explained by the high-order nonlinear effects in the ferroelectric material. The main contribution to the tunability of the resonant frequency under dc electric field can be attributed to electrostriction, which is nonlinear with respect to the mechanical deformation. It is shown that the upward or downward shift in the resonant frequency is given by the sign of the nonlinear component of the electrostriction tensor M. The model is verified by comparing the results with the measured microwave input impedance of BaTi O3 and Ba0.25 Sr0.75 Ti O3 based TFBARs. For a positive sign of the nonlinear coefficient of electrostriction M, the model predicts an upward shift of the resonant frequencies (resonance and antiresonance) under dc biasing in case of the TFBAR based on BaTi O3, whereas a negative sign of the nonlinear coefficient of electrostriction M predicts downward shift of the resonant frequencies for TFBAR based on Ba0.25 Sr0.75 Ti O3 films. © 2008 American Institute of Physics.
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| 8. |
- Deleniv, Anatoli, et al.
(author)
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Modeling gap discontinuity in coplanar waveguide using quazi-static spectral domain method
- 2000
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In: International Journal of RF and Microwave Computer-Aided Engineering. - 1096-4290 .- 1099-047X. ; 10:3, s. 150-158
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Journal article (peer-reviewed)abstract
- An efficient computer technique based on the spectral domain method is presented to solve the problem of modeling coplanar gap discontinuity. Comparison with available published data is done to confirm the accuracy of the method.
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| 9. |
- Gevorgian, Spartak, 1948, et al.
(author)
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CAD Model of a Gap in a Coplanar Waveguide
- 1996
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In: International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering. - 1050-1827. ; 6:5, s. 369-377
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Journal article (peer-reviewed)abstract
- The partial capacitance approach and conformal mapping techniques are used to evaluate simple closed-form models for parallel and series capacitances of equivalent π-network of a symmetric gap in a CPW. Models are compared with experimental data and full wave analysis. They are useful for a wide range of CPW parameters and frequencies.
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| 10. |
- Gevorgian, Spartak, 1948, et al.
(author)
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Critical Limitations in Low-Loss Narrow-Band filter Design
- 1994
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In: Microwave Conference, 1994. 24th European. ; 1, s. 522 - 527
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Conference paper (peer-reviewed)abstract
- Download CitationEmailPrintRequest PermissionsSimulation and experimental results for 18 GHz central frequency and 1-2 % bandwidth YBCO/MgO microstrip bandpass filters are presented. The simulation has been carried out using recently developed HTSC microwave software, Vendik and Kollberg (1), comparing the results with commercially available software (Microwave and RF Design Systems (mds) from Hewlett Packard, and Microwave Harmnonica (MH) from Compact Software). Problems limiting narrow-band microstrip filter development at millimeter wavelengths are studied and discussed
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| 11. |
- Gevorgian, Spartak, 1948, et al.
(author)
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Simple and accurate dispersion expression for the effective dielectric constant of coplanar waveguides
- 1997
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In: IEE Proceedings: Microwaves, Antennas and Propagation. - : Institution of Engineering and Technology (IET). - 1350-2417 .- 1359-706X. ; 144:2, s. 145-148
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Journal article (peer-reviewed)abstract
- A conformal mapping based analytic formula is proposed for computation of the frequency dependent effective dielectric constant, ɛeff, of coplanar waveguides (CPW). This formula is correct in a wide frequency band and for wide range of CPW parameters, and models both negative and positive slopes in the frequency dependence of ɛeff. The results are especially useful for modeling microwave/millimetrewave and ultrahigh speed digital interconnects.
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| 12. |
- Vendik, Irina, et al.
(author)
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Fibre Optical Phased Arrays
- 1990
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In: Zarubeznaya Radioelektronika (USSR). ; , s. 86-93
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Journal article (peer-reviewed)
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