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Research Merits as of January 2022
V. Yantchev has more than 200 publications, from which about 60 in peer-reviewed journals, more than 60 patents, while the rest in Renowned IEEE Conference Proceedings.
Sum of the times cited: 2335 (SCOPUS); 6000(Google Scholar)
Average citations per article incl. patents: > 20
h-Index: 25 (SCOPUS); 44 (Google Scholar)
i10-index: 92 (Google Scholar)
Invited Talks: 9
Career Related
Since 2015, RF SAW/BAW/LWR Design Consultant, owner of Q-ARTS Consulting Ltd., Bulgaria
Since May 2025, Associate Professor at the Technical University of Sofia, Bulgaria
October 2020 - November 2024, full time RF SAW Devices Design Consultant contracted by Huawei, Finland
Jan. 2019 - October 2020, full time XBAR Filter Design Consultant contracted by Resonant Inc., USA
Aug. 2018 - Jan. 2019, MEMS Design Engineer at TDK Invensense, The MEMS SBG, Milano, Italy
2015 - 2018, Guest Professor at Chalmers University of Technology, Biophysics Tech. Lab., Dept.Chemistry & Chemical Engineering, Goteborg, Sweden
2011 - 2015, Associate Professor, Dept. Solid State Electronics, Uppsala University, Sweden
2006 - 2011 Senior Researcher, Dept. Solid State Electronics, Uppsala University, Uppsala, Sweden
2004-2006 PostDoc, Dept. Solid State Electronics, Uppsala University, Uppsala, Sweden
2002-2003 Maria Curie Fellowship at Dept. Solid State Electronics, Uppsala University, Sweden
2000-2004 Ph.D in Microwave Physics, University of Sofia, Bulgaria
1994-1999 Study of Technical Physics, University of Sofia, Sofia, Bulgaria
2000 M.Sc. in Microelectronics and Information Technology, University of Sofia, Bulgaria.
Activities in the Professional Community
Member of the Technical Program Committee of the Int. IEEE Ultrasonic Symposium (IUS), 2014 - 2024
Member of the Scientific Committee of the European Frequency and Time Forum (EFTF), 2010 - 2020
Goran Gustafssons Award for Younger Researchers, Stockholm, Sweden, 2009
Uppsala University Innovation Prize 'Hjärnäpplet', Uppsala, Sweden, 2009, 2011
Research Assistant position by the Swedish Research Council (VR), Sweden, 2010-14
2015-2017 Invited Lecturer at the Technical University of Sofia, Sofia, Bulgaria
Expertise
Long-standing experience in RF Microacoustic wave devices and physics (SAW, BAW, Lamb wave) with major contributions to:
The Invention and subsequent development of Thin Film Lamb Wave Resonator (LWR) technology including XBAR.
Pioneering investigations on Thin Film Bulk Acoustic Resonators (FBAR) on Sc doped AlN piezoelectric films
The development of Thin Film Bio-sensors employing shear waves in tilted-c axis AlN films
The fundamentals of the Grating Assisted Inter-mode SAW-BAW Coupling as well as the stopband characteristics of Surface Acoustic Wave (SAW) Phononic Transducers and Resonators.
The development of Coupling-of-Modes theory consistent with the Plesski's dispersion equation.
The development of BAW and SAW sensors and microfluidic actuators.
Strong experience in SAW and TF-SAW modeling with finite element and COM analyses
Strong experience in Micro-fabrication techniques - work in clean-room environment
Strong experience in Project and Thesis Supervision
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Prototypes: A Lab-on-Chip Resonant SAW Bio-Sensor
Fabricated wafer with Lamb Wave Resonators
SAW Phononic Resonators as Fabricated
The first XBAR Lamb Wave Filter @ 5GHz, 600MHz BW, No Matching Required, withstanding up to 2W Input Power
Selected Recent Publications
V. Yantchev, Yuancheng Ji, "On the Design of High Overtone BAW Resonators with Enhanced Power Handling", Invited Talk, in Proc. 2024 IEEE MTT-S International Conference on Microwave Acoustics & Mechanics (IC-MAM).
2. V. Yantchev, A. Erbes, K. Kustanovich, Yuancheng Ji ,"A Spurious Free SH-SAW Resonator Employing a Novel Multilayer Stack", in Proc. 2022 IEEE International Ultrasonics Symposium, 2022
3. V. Yantchev, V. Plessky, B. Garcia "Transversely excited film bulk acoustic resonator using rotated Y-X cut lithium niobate
United States Patent 10790802, June 2020, Link
4. V. Yantchev, Transversely-excited film bulk acoustic filters with symmetric layout, United States Patent 10868513, July 2020, Link
5. V. Yantchev, Transversely-excited film bulk acoustic resonator with half-lambda dielectric layer, United States Patent 1086851, March 2020, Link
6. V. Yantchev, Filter using transversely-excited film bulk acoustic resonators with multiple frequency setting layers, United States Patent 10992284, July 2020, Link
7. P. Turner, B. Garcia, V. Yantchev et. al., "5GHz n79 wide-band microacoustic filter using lithium niobate membrane", Electronics Letters, Volume 55, Issue 17, 22 August 2019, p. 942 – 944
9. K. Kustanovich, V. Yantchev et. al., "A High-performance Lab-on-a-chip Liquid Sensor Employing Surface Acoustic Wave Resonance", in Special Issue on Microfluidic Systems with Integrated Sensors, J. Micromech. Microeng., 27,114002, 2017 (selected in JMM Highlights)
9. V. Yantchev, J. Krizz, B. Oliver, A. Weidling and T. Fabian, "Design and Fabrication of Efficient Piezo-MEMS Voltage Transformers", in Proc. 2017 IEEE Int. Ultrasonic Symposium, Washington DC, USA, Sept 07-10, 2017
10. V. Yantchev and I. Katardjiev, "Thin film Lamb wave resonators in frequency control and sensing applications: a review", TOPICAL REVIEW in J. Micromech. Microeng., Vol. 23 (4) 2013
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