Andrei Vorobiev

Senior forskare at Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Andrei Vorobiev received the M.Sc. degree in physics of semiconductors and dielectrics from Gorky State University, Gorky, Russia, in 1986 and Ph.D. degree in physics and mathematics from Institute for Physics of Microstructures of Russian Academy of Sciences (IPM RAS), Nizhny Novgorod, Russia, in 2000. Since 1986 he has been an engineer and then the head of Laboratory of Microelectronics at Design Office of Measuring Instruments, Gorky, Russia with research interests in area of development of hybrid film microwave integrated circuits. In 1991 he joined the Technology Division of IPM RAS as senior research associate with research interests in the area of high temperature superconductor films and multi-layer structures. Since 2001, he is at Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden, at first as a Postdoctoral Fellow and then as a Researcher. In 2008 he received title of docent (broadly equivalent to Associate Professor) in physical electronics awarded at Chalmers University of Technology. He has authored or coauthored over 100 papers and conference presentations. His research interests are in the area of development and application of emerging functional materials and phenomena in microwave components and devices based on multiferroic and ferroelectric thin films including development of materials, thin film and microtechnology fabrication/processing steps and experimental investigation.

Source: chalmers.se

Projects

2015–2017

High mobility graphene transistors with ferroelectrically induced bandgap

Andrei Vorobiev Terahertz and Millimetre Wave Laboratory
Swedish Research Council (VR)

2014–2019

Carbon Based High Speed 3D GaN Electronics System

Johan Liu Electronics Material and Systems Laboratory
Per Hyldgaard Electronics Material and Systems Laboratory
Jan Stake Terahertz and Millimetre Wave Laboratory
Andrei Vorobiev Terahertz and Millimetre Wave Laboratory
Swedish Foundation for Strategic Research (SSF)

2013–2015

Integrated graphene/ferroelectric films for microwave/THz devices

Jan Stake Terahertz and Millimetre Wave Laboratory
Andrei Vorobiev Terahertz and Millimetre Wave Laboratory
Spartak Gevorgian Terahertz and Millimetre Wave Laboratory
MICHAEL ANDERSSON Terahertz and Millimetre Wave Laboratory
Swedish Research Council (VR)

2015–2016

RF energy harvesting for M2M communication

Jan Stake Terahertz and Millimetre Wave Laboratory
Andrei Vorobiev Terahertz and Millimetre Wave Laboratory
VINNOVA

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Publications

2017

Dielectric properties of Mn doped Bismuth Barium Titanate based ceramic thin films prepared by PLD technique

F. Touati, Z. Ahmad, Andrei Vorobiev et al
Ceramics International. Vol. 43 (12), p. 8778-8783
Journal article
2017

Effect of oxide traps on channel transport characteristics in graphene field effect transistors

Olof Engström, Andrei Vorobiev, Jan Stake et al
Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics. Vol. 35 (1), p. 01A115-
Journal article
2017

A flexible graphene terahertz detector

MICHAEL ANDERSSON, Andrei Vorobiev, Jan Stake et al
Applied Physics Letters. Vol. 111 (2)
Journal article
2017

A heterodyne graphene FET detector at 400 GHz

Jan Stake, Xinxin Yang, MICHAEL ANDERSSON et al
42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Paper in proceedings
2017

A 400-GHz Graphene FET Detector

Xinxin Yang, MICHAEL ANDERSSON, Andrei Vorobiev et al
IEEE Transactions on Terahertz Science and Technology. Vol. 7 (5), p. 614-616
Journal article
2016

Characterization of Al2O3 gate dielectric for graphene electronics on flexible substrates

Xinxin Yang, Jan Stake, Andrei Vorobiev et al
2016 Global Symposium on Millimeter Waves (GSMM) & ESA Workshop on Millimetre-Wave Technology and Applications, p. 153-156
Paper in proceedings
2016

Feasibility of Ambient RF Energy Harvesting for Self-Sustainable M2M Communications Using Transparent and Flexible Graphene Antennas

Jan Stake, Ulrika Engström, MICHAEL ANDERSSON et al
IEEE Access. Vol. 4, p. 5850-5857
Journal article
2015

Composite Ferroelectric FBARs That Are Switchable Between the First and Second Harmonics: Experimental Demonstration

Spartak Gevorgian, Andrei Vorobiev
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. Vol. 62 (3), p. 565-575
Journal article
2015

Effect of ferroelectric substrate on carrier mobility in graphene field-effect transistors

Andrei Vorobiev, Samina Bidmeshkipour, MICHAEL ANDERSSON et al
Applied Physics Letters. Vol. 107 (17), p. Article Number: 173106-
Journal article
2015

Tunable ferroelectric FBARs: An overview

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2014

Graphene in Millimeter Wave Devices

MICHAEL ANDERSSON, Jan Stake, Andrei Vorobiev et al
39th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2014, Tucson, United States, 14-19 September 2014, p. Art. no. 6956168-
Paper in proceedings
2014

Impact of the electrode material and shape on performance of intrinsically tunable ferroelectric FBARs

Spartak Gevorgian, Andrei Vorobiev
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. Vol. 61 (5), p. 840-848
Journal article
2014

Effect of growth conditions on microstructure of BiFeO3-0.33BaTiO(3) films and performance of bulk acoustic wave resonators

Andrei Vorobiev, Eva Olsson, Spartak Gevorgian et al
Journal of Applied Physics. Vol. 115 (8)
Journal article
2014

Extraction of carrier transport properties in graphene from microwave measurements

Andrei Vorobiev, Jan Stake, Spartak Gevorgian et al
European Microwave Conference (EuMC), 2014 44th, p. 359 - 362
Paper in proceedings
2014

Intrinsically Switchable and Tuneable FBARs for Microwave Communication and Sensor Applications

Andrei Vorobiev, Spartak Gevorgian
GigaHertz Symposium, p. 43-
Paper in proceedings
2014

Intrinsically switchable bulk acoustic wave resonators based on paraelectric films

Spartak Gevorgian, Andrei Vorobiev
2014 44th European Microwave Conference, EuMC 2014 - Held as Part of the 17th European Microwave Week, EuMW 2014, Rome, Italy, 6-9 October 2014, p. 347-350
Paper in proceedings
2014

Intrinsically switchable thin film bulk acoustic wave resonators

Spartak Gevorgian, Andrei Vorobiev
Applied Physics Letters. Vol. 104 (22), p. Art. no. 222905-
Journal article
2014

Intrinsically tunable bulk acoustic wave resonators based on sol-gel grown PMN-PT films

Matjaz Spreitzer, Danilo Suvorov, Andrei Vorobiev et al
Journal of Applied Physics. Vol. 116 (6), p. Art. no. 064101-
Journal article
2013

Loss balance in tunable ferroelectric FBARs

Spartak Gevorgian, Andrei Vorobiev
8th European Microwave Integrated Circuits Conference, EuMIC 2013 - Held as Part of 16th European Microwave Week, EuMW 2013; Nuremberg; Germany; 6 October 2013 through 8 October 2013, p. 372-375
Paper in proceedings
2013

Microwave characterization of Ti/Au-graphene contacts

Andrei Vorobiev, Spartak Gevorgian, Jie Sun et al
Applied Physics Letters. Vol. 103 (17), p. 173111-
Journal article
2013

Ferroelectric film bulk acoustic wave resonators for liquid viscosity sensing

Andrei Vorobiev, Spartak Gevorgian
Journal of Applied Physics. Vol. 114 (8)
Journal article
2013

Ferroelectric film bulk acoustic wave resonators for liquid viscosity sensing

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2013

Effect of Growth Conditions on Performance of BiFeO3-0.33BaTiO3 BAW Resonators

Spartak Gevorgian, Andrei Vorobiev, Eva Olsson et al
Paper in proceedings
2013

Tunable FBARs based on sol-gel grown PMN-PT films

Danilo Suvorov, Matjaz Spreitzer, Andrei Vorobiev et al
43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013, Nuremberg, Germany, 7-10 October 2013, p. 1339-1342
Paper in proceedings
2013

Towards Graphene Electrodes for High Performance Acoustic Resonators

Jan Stake, Jie Sun, Andrei Vorobiev et al
WOCSDICE, p. 99-100
Paper in proceedings
2013

Loss balance in tunable ferroelectric FBARs

Spartak Gevorgian, Andrei Vorobiev
43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013, Nuremberg, Germany, 7-10 October 2013, p. 1343-1346
Paper in proceedings
2013

Enhanced tunable performance of high Q-factor BaxSr1-xTiO3 film bulk acoustic wave resonators

Spartak Gevorgian, Andrei Vorobiev
International Journal of Microwave and Wireless Technologies. Vol. 5 (3), p. 361-369
Journal article
2013

Impedance of DC-Bias-Controlled Composite FBARs

Andrei Vorobiev, Spartak Gevorgian
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. Vol. 60 (4), p. 795-804
Journal article
2013

Tuneable Film Bulk Acoustic Wave Resonators

Andrei Vorobiev, Alexander Tagantsev, Spartak Gevorgian
Book
2013

Tunable FBARs Based on Sol-Gel Grown PMN-PT Films

Andrei Vorobiev, Spartak Gevorgian, Danilo Suvorov et al
8th European Microwave Integrated Circuits Conference, EuMIC 2013 - Held as Part of 16th European Microwave Week, EuMW 2013; Nuremberg; Germany; 6 October 2013 through 8 October 2013, p. 368-371
Paper in proceedings
2012

Microwave characterization of intrinsically tunable FBARs

Spartak Gevorgian, Andrei Vorobiev
Journal of Logic and Computation
Paper in proceedings
2012

Intrinsically tunable 0.67 BiFeO3-0.33 BaTiO3 thin film bulk acoustic wave resonators

Eva Olsson, Markus Löffler, Andrei Vorobiev et al
Applied Physics Letters. Vol. 101 (23), p. 232903-232903-5-
Journal article
2012

Tunable BiFeO3-BaTiO3 thin film bulk acoustic wave resonators for microwave applications

Spartak Gevorgian, Markus Löffler, Andrei Vorobiev et al
Paper in proceedings
2012

ADS Based 1D Model of Solidly Mounted FBARs Including Longitudinal and Shear Waves

Andrei Vorobiev, Spartak Gevorgian
Integrated Ferroelectrics. Vol. 134 (1), p. 75-80
Journal article
2012

Growth temperature dependent dielectric properties of BiFeO3 thin films deposited on silica glass substrates

Spartak Gevorgian, Taimur Ahmed, Andrei Vorobiev
Thin Solid Films. Vol. 520 (13), p. 4470-4474
Journal article
2012

Improved Tunable Performance of high Q-factor BaxSr1-xTiO3 Film Bulk Acoustic Wave Resonators

Andrei Vorobiev, Spartak Gevorgian
15th European Microwave Week - Space for Microwaves Conference Proceedings, p. 1-3
Paper in proceedings
2012

Tunable FBARs: Intrinsic vs. extrinsic tunability

Spartak Gevorgian, Andrei Vorobiev
Journal of Logic and Computation
Paper in proceedings
2012

Adhesion layer-bottom electrode interaction during BaxSr1−xTiO3 growth as a limiting factor for device performance

Spartak Gevorgian, Eva Olsson, Markus Löffler et al
Journal of Applied Physics. Vol. 111 (12), p. Art. no. 124514-
Journal article
2012

Microwave Response of BiFeO3 Films in Parallel-Plate Capacitors

Spartak Gevorgian, Andrei Vorobiev, Taimur Ahmed
Integrated Ferroelectrics. Vol. 134 (1), p. 111-117
Journal article
2011

Correlations between microstructure and Q-factor of tunable thin film bulk acoustic wave resonators

Andrei Vorobiev, Markus Löffler, Eva Olsson et al
Journal of Applied Physics. Vol. 110 (5)
Journal article
2011

Microwave response of BiFeO3 films in parallel-plate capacitors

Andrei Vorobiev, Taimur Ahmed, Spartak Gevorgian
Paper in proceedings
2011

Dielectric model of point charge defects in insulating paraelectric perovskites

Andrei Vorobiev, Spartak Gevorgian, V. Buniatian et al
Journal of Applied Physics. Vol. 110 (9)
Journal article
2011

Model of ferroelectric FBARs including longitudinal and shear waves

Andrei Vorobiev, Spartak Gevorgian
Conference poster
2011

Microwave losses in ferroelectric varactors

Spartak Gevorgian, Andrei Vorobiev
Paper in proceedings
2011

Effect of interface roughness on acoustic loss in tunable thin film bulk acoustic wave resonators

Andrei Vorobiev, Eva Olsson, Markus Löffler et al
Journal of Applied Physics. Vol. 110 (2)
Journal article
2010

Ferroelectrics in passive scanning antennas

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2010

Silicon substrate integration of BST based tunable TFBARs using all-dielectric SiO2/AlN Bragg reflectors

John Berge, Spartak Gevorgian, Andrei Vorobiev et al
2010 10th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF 2010 - Digest of Papers, p. 41-44
Paper in proceedings
2010

Evaluation of tunable FBARs with improved performance

Spartak Gevorgian, Andrei Vorobiev
Paper in proceedings
2010

Ferroelectric thin film varactors for microwave devices, methods of characterization, circuit models

Andrei Vorobiev
Ferroelectric Films at Microwave Frequencies, edited by P. Bao, T. J. Jackson and P. M. Suherman, Research Signpost, p. 57-94
Chapter in monograph, book
2010

Improved performance of tunable BaxSr1-xTiO3 TFBARs

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2010

Switchable/Tunable FBARs: Current status and potential

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2010

Layout Optimization of Small-Size Ferroelectric Parallel-Plate Varactors

Spartak Gevorgian, Dan Kuylenstierna, Andrei Vorobiev et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (6), p. 1475-1484
Journal article
2010

A highly integrated heterogeneous micro- and mm-wave platform

L. Pettersson, Jean Christophe Houdber, Lars Aspemyr et al
Journal of Logic and Computation, p. 461-464
Conference contribution
2010

Tunable BaxSr1-xTiO3 FBARs based on SiO2/W Bragg reflectors

Andrei Vorobiev, Spartak Gevorgian
Journal of Logic and Computation, p. 1444-1447
Conference contribution
2010

Impact of the electrodes on the tunability of paraelectric BST film based FBARs

Andrei Vorobiev, Spartak Gevorgian
13th European Microwave Week 2010, EuMW2010: Connecting the World - 40th European Microwave Conference, EuMC 2010; Paris; 28 September 2010 through 30 September 2010, p. 1210-1213
Paper in proceedings
2010

Growth and dielectric characterisation of large grain BiFeO3 thin films on amorphous SiO2 substrates

Sten Eriksson, Andrei Vorobiev, Spartak Gevorgian et al
IOP Conference Series: Materials Science and Engineering - Fundamentals and Technology of Multifunctional Oxide Thin Films (Symposium G, EMRS 2009 Spring Meeting) 8–12 June 2009, Strasbourg, France. Vol. 8 (1), p. 012001-
Paper in proceedings
2010

Microwave and thz applications of ferroelectrics and multiferroics

Spartak Gevorgian, Andrei Vorobiev
Conference contribution
2010

The effect of Bragg reflectors on the electromechanical performance of parallel-plate ferroelectric capacitors

Andrei Vorobiev, Martin Norling, Spartak Gevorgian et al
IOP Conference Series: Materials Science and Engineering - Fundamentals and Technology of Multifunctional Oxide Thin Films (Symposium G, EMRS 2009 Spring Meeting) 8–12 June 2009, Strasbourg, France. Vol. 8 (1), p. 012011-
Paper in proceedings
2010

Ferroelectric varactors suitable for capacitive shunt switching

Spartak Gevorgian, Guru Subramanyam, Andrei Vorobiev
Patent
2010

Tunable thin film bulk acoustic wave resonators with improved Q-factor

Andrei Vorobiev, Spartak Gevorgian
Applied Physics Letters. Vol. 96 (21), p. Article Number: 212904 -
Journal article
2009

CAD oriented frequency, temperature, and DC bias dependent small-signal, scalable circuit model of parallel-plate paraelectric varactors

T Lewin, Andrei Vorobiev, Spartak Gevorgian et al
International Journal of RF and Microwave Computer-Aided Engineering. Vol. 19 (2), p. 243--257-
Journal article
2009

Tuneable resonator

Andrei Vorobiev, Thomas Lewin, Harald Jacobsson et al
Patent
2009

A voltage controlled switching device

T Lewin, Andrei Vorobiev, Martin Norling et al
Patent application
2009

The potential of multiferroics for GHz and THz applications

Spartak Gevorgian, Andrei Vorobiev
Paper in proceedings
2009

Composition dependent tunable microwave properties of thin BaxSr1-xTiO3 films

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2009

Agile Microwave Dielectrics: Are there Other Alternatives to BaxSr1-xTiO3

Spartak Gevorgian, Andrei Vorobiev
Paper in proceedings
2008

Field and temperature dependent parameters of the dc field induced resonances in BaxSr1-xTiO3-based tunable thin film bulk acoustic resonators

Spartak Gevorgian, Andrei Vorobiev, Martin Norling et al
Journal of Applied Physics. Vol. 103 (6), p. 064508-
Journal article
2008

On-Wafer characterization of varactors using resonating microprobes

Spartak Gevorgian, Anatoli Deleniv, Andrei Vorobiev
IEEE trans on microwave theory and techniques. Vol. 56 (5), p. 1105-
Journal article
2008

Room temperature dynamic life time measurements of ferroelectric varactors

K Boustedt, Andrei Vorobiev, Spartak Gevorgian et al
Paper in proceedings
2008

Tunable Resonator (FBAR)

Andrei Vorobiev, Harald Jacobsson, Spartak Gevorgian et al
Patent application
2007

Ferroelectric varactors suitable for capacitive shunt switching and wireless sensing

Guru Subramanyam, Andrei Vorobiev, Spartak Gevorgian
Patent application
2007

The effect of growth temperature on the nanostructure and dielectric response of BaTiO3 ferroelectric films

Spartak Gevorgian, Andrei Vorobiev, John Berge
Thin Solid Films. Vol. 515 (16), p. 6302-6308
Journal article
2007

Ferroelectric varactors suitable for capacitive shunt switching

Guru Subramanyam, Andrei Vorobiev
Patent
2007

Thin film Ba0.25Sr0.75TiO3 voltage tunable capacitors on fused silica substrates for applications in microwave microelectronics

John Berge, Andrei Vorobiev, Spartak Gevorgian
Thin Solid Films. Vol. 515 (16), p. 6606-6610
Journal article
2007

A low-noise K-band VCO based on room-temperature ferroelectric varactors

Andrei Vorobiev, Spartak Gevorgian, Martin Norling et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 55 (2), p. 361-369
Journal article
2007

Performance of Coplanar Waveguides on Surface Passivated Highly Resistive Silicon Covered by Ferroelectric Thin Film

Andrei Vorobiev, Dimitri Lederer, Martin Norling et al
IEEE MTT-S International Microwave Symposium Digest, Honolulu, Hawaii, p. 2055 - 2058
Paper in proceedings
2007

Experimental characterization of the 3rd order nonlinearities in thin film parallel-plate ferroelectric varactors

Pär Rundqvist, Anatoli Deleniv, Erik Kollberg et al
Journal of Logic and Computation. Vol. 2, p. 683-686
Paper in proceedings
2007

Comparison of high-resistivity silicon surface passivation methods

Spartak Gevorgian, Klaus Reimann, Martin Norling et al
EuMIC 2007 Proceedings, p. 215-218
Paper in proceedings
2007

Tunable Solidly Mounted Thin Film Bulk Acoustic Resonators Based on BaxSr1-xTiO3 Films

Andrei Vorobiev, Spartak Gevorgian, John Berge et al
IEEE Microwave and Wireless Components Letters. Vol. 17 (9), p. 655-657
Journal article
2006

Composite Right/Left Handed Transmission Line Phase Shifter Using Ferroelectric Varactors

Peter Linner, Spartak Gevorgian, Andrei Vorobiev et al
Microwave and Wireless Components Letters. Vol. 16 (4), p. 167-169
Journal article
2006

40 GHz Lumped Element Tunable Bandpass Filters with Transmission Zeros Based on Thin Ba0.25Sr0.75TiO3 (BST) Film Varactors

Dan Kuylenstierna, Spartak Gevorgian, Andrei Vorobiev
Paper in proceedings
2006

The Potential of Thin Film Ferroelectric Varactors for Applications in Large Microwave Arrays

Dan Kuylenstierna, Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2006

Broadband microprobe characterization of the ferroelectric films and varactors

Dan Kuylenstierna, Pär Rundqvist, Spartak Gevorgian et al
36th European Microwave Conference, EuMC 2006; Manchester; United Kingdom; 10 September 2006 through 12 September 2006, p. 843-846
Paper in proceedings
2006

The effect of interfacial transition layer on performance of thin film ferroelectric capacitors

John Berge, Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2006

Ba0.25Sr0.75TiO3 thin film varactors on SrRuO3 bottom electrode

Spartak Gevorgian, Khaled Khamchane, Andrei Vorobiev et al
J. Appl. Phys. Vol. 99, p. 034103-
Journal article
2006

X-band left handed phase shifter using thin film Ba0.25Sr0.75TiO3 ferroelectric varactors

Spartak Gevorgian, Dan Kuylenstierna, Eric Ash et al
Conference Proceedings. 36th European Microwave Conference, 10-15 Sep. 2006, Manchester, UK, 2006, p. 847--50-
Paper in proceedings
2006

The effect of SiO2, Pt and Pt/Au templates on microstructure and permittivity of Ba0:25Sr0:75TiO3 films

Pär Rundqvist, Spartak Gevorgian, Andrei Vorobiev
J. Appl. Phys. Vol. 100, p. 114116-
Journal article
2006

Microwave performance of varactors based on nanostructured BSTO films

Andrei Vorobiev, John Berge, Spartak Gevorgian
Paper in proceedings
2006

Thin film Ba0.25Sr0.75TiO3 varactors on Au bottom electrode for microwave applications

Andrei Vorobiev, John Berge, Spartak Gevorgian
Paper in proceedings
2006

Large Signal Circuit Model of Parallel-Plate Ferroelectric Varactors

Andrei Vorobiev, Spartak Gevorgian, Pär Rundqvist et al
J. Appl. Phys.. Vol. 100, p. 074101-1
Journal article
2006

Ferroelectric thin-film based two-dimensional electromagnetic bandgap structures

Andrei Vorobiev, Spartak Gevorgian, U. Khan et al
Integrated Ferroelectrics. Vol. 86 (1), p. 67-76
Journal article
2006

Microwave performance of thin film ferroelectric varactors in the wide temperature range

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2005

Microwave performance of thin film ferroelectric varactors in the wide temperature range

Andrei Vorobiev, Spartak Gevorgian
Paper in proceedings
2005

Microwave Loss Mechanisms in Ba0.25Sr0.75TiO3 Films

Spartak Gevorgian, Pär Rundqvist, Andrei Vorobiev
Materials Science and Engineering B. Vol. 118, p. 214-218
Journal article
2005

Composite Right/Left Handed Transmission LinePhase Shifter using Ferroelectric Varactors

Spartak Gevorgian, Andrei Vorobiev, Dan Kuylenstierna
Conference contribution
2005

Analysis of the influence of SrRuO3 buffer layer on ferroelectric varactors for multiplier applications

Spartak Gevorgian, Erik Kollberg, Pär Rundqvist et al
Paper in proceedings
2005

Analysis of multiplier with a novel symmetric ferroelectric varactor

Pär Rundqvist, Spartak Gevorgian, Erik Kollberg et al
Journal article
2005

Ultrawide-band tunable true-time delay lines using ferroelectric varactors

Spartak Gevorgian, Peter Linner, Andrei Vorobiev et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 53 (6, pt.2), p. 2164-70
Journal article
2005

A balanced 23 GHz voltage-controlled oscillator based on ferroelectric varactors

Andrei Vorobiev, Harald Jacobsson, Spartak Gevorgian et al
Gigahertz 2005, p. 279-282
Paper in proceedings
2004

Non-destructive microwave characterization of ferroelectric films on conductive substrates

Pär Rundqvist, Andrei Vorobiev, Khaled Khamchane et al
Integrated Ferroelectrics. Vol. 60, p. 1-19
Journal article
2004

Integration of parallel-plate ferroelectric varactors with BCB-on-silicon microstrip circuits

Dan Kuylenstierna, Andrei Vorobiev, Spartak Gevorgian
2004 IEEE MTT-S International Microwave Symposium Digest, 6-11 June 2004. Vol. Vol.3, p. 1907-10
Paper in proceedings
2004

Microwave loss mechanisms in Ba0.25Sr0.75TiO3$ thin film varactors

Pär Rundqvist, Andrei Vorobiev, Spartak Gevorgian
Journal of Applied Physics. Vol. 96 (8), p. 4642-9
Journal article
2004

Ba 0.25Sr 0.75TiO3 -metal microstructure, surface morphology and interfaces.

Andrei Vorobiev, Pär Rundqvist, Spartak Gevorgian
Paper in proceedings
2004

Ferroelectrically tuneable delay lines

Andrei Vorobiev, Peter Linner, Spartak Gevorgian et al
Conference Proceedings. 34th European Microwave Conference, 12-14 Oct. 2004. Vol. vol.1, p. 157-60
Paper in proceedings
2004

Silicon substrate integrated ferroelectric microwave components

Anders Eriksson, Pär Rundqvist, Spartak Gevorgian et al
Integrated Ferroelectrics. Vol. 66, p. 125-38
Journal article
2004

Large signal circuit model of parallel-plate ferroelectric

Andrei Vorobiev, Spartak Gevorgian, Pär Rundqvist
34th European Microwave Conference; London; United Kingdom; 12 October 2004 through 14 October 2004. Vol. 3, p. 1505-1508
Paper in proceedings
2003

Tunable electromagnetic bandgap performance of coplanar waveguides periodically loaded by ferroelectric varactors

Dan Kuylenstierna, Spartak Gevorgian, G. Subramanyam et al
Microwave and Optical Technology Letters. Vol. 39 (2), p. 81-86
Journal article
2003

dc and microwave resistivities of SrRuO_3 films deposited on SrTiO_3

Andrei Vorobiev, Khaled Khamchane, Ivanov Zdravko et al
Journal of Applied Physics,. Vol. 93 (2), p. 1291-7
Journal article
2003

Correlation between microstructure, DC resistivity and magnetoresistance of SrRuO3 films

Zdravko Ivanov, Spartak Gevorgian, Pär Rundqvist et al
Materials Research Society Symposium - Proceedings,. Vol. 751, p. 67-71
Paper in proceedings
2003

Tunable electromagnetic bandgap structures based on ferroelectric films

Dan Kuylenstierna, Spartak Gevorgian, Andrei Vorobiev et al
2003 IEEE International Antennas and Propagation Symposium and USNC/CNC/URSI North American Radio Science Meeting, Jun 22-27 2003. Vol. 4, p. 879-882
Paper in proceedings
2003

Silicon substrate integrated high Q-factor parallel-plate ferroelectric varactors

Pär Rundqvist, Andrei Vorobiev, Khaled Khamchane
Appl. Phys. Lett.. Vol. 83, p. 3144-
Journal article
2003

Conduction and microwave loss mechanisms in Ba0.25Sr0.75TiO3 films

Spartak Gevorgian, Khaled Khamchane, Andrei Vorobiev et al
Ferroelectric Thin Films XII, (Mater. Res. Soc. Symposium Proceedings). Vol. 784, p. 357-
Paper in proceedings
2003

Tuneable Electromagnetic Bandgap structures based on Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/ parallel-plate varactors on silicon Coplanar Waveguides

Andrei Vorobiev, Dan Kuylenstierna, Spartak Gevorgian et al
33rd European Microwave Conference Proceedings, 7-9 Oct. 2003. Vol. Vol.3, p. 1111-14
Paper in proceedings
2003

Silicon substrate integrated high Q-factor parallel-plate ferroelectric varactors for microwave/millimeterwave applications

Spartak Gevorgian, Khaled Khamchane, Andrei Vorobiev et al
Appl. Phys. Lett.. Vol. 83 (15), p. 3144-6
Journal article
2003

Microwave power dependent properties of ferroelectric varactors.

Spartak Gevorgian, Andrei Vorobiev, Pär Rundqvist
Paper in proceedings
2002

SrTiO3 thin film varactors on Si for microwave applications

Spartak Gevorgian, Pär Rundqvist, Andrei Vorobiev
Mat. Res. Soc.. Vol. 748, p. 477-
Paper in proceedings
2002

SrTiO3 thin film varactors on Si for microwave applications

Khaled Khamchane, Pär Rundqvist, Spartak Gevorgian et al
Journal article
2002

Microwave properties of SrTiO3/SrRuO3/CeO2/YSZ heterostructure on low-resistivity silicon

Spartak Gevorgian, Pär Rundqvist, Andrei Vorobiev
Paper in proceedings