He had international colaboration with

1. Technische Universitaet Dresden, Germany, 1989-1990

2. McMaster University, Hamilton, Ontario, Canada, 1989-1990

3. RF Monolithics, Dallas, Texas, USA, 1992-1993

4. Technische Universitaet Munchen, Germany1993

5. Advanced SAW Products, Neuchatel, Switzerland, 1993

6. Raytheon Research Division, Lexington, Massachusetts, USA 1994

7. National Institute of Standards and Technology, Boulder, USA, 1994

8. Bulgarian National Research Fund 1994-1996

9. Research Institute of Posts and Telecommunications, Wuhan, China, 1995-1996

10. Fujitsu Laboratories, Akashi, Japan, 1996-1997

11. M-tron Industries, Yankton, South Dakota, USA, 1997-1998

12. Vectron International, Hudson, New Hampshire, USA, 1998-2006

13. LG Precision, Seoul, South Korea, 1999-2000

14. National Institute of Material Chemistry, Japan 1999-2000

15. Forschungszentrum Karlsruhe, Germany 1999-2006

Publications

1. E. Trzeba, I. Avramov, Ein Mikroakustischer Multimoden Oszillator, In: G. Hoffmann, D. Holzmann, F. Jager, K. Riedling, Mikroelektronik, Technische Universitдt Dresden, Deutschland 285-286; 455-456 (1987)

2. I. Awramow, T. Thienel, Ein hochstabiler abstimmbarer 750 MHz Oszillator auf der Basis von Oberflaechentransversalwellen (OTW), Nachrichtentechnik Elektronik, Berlin, Vol. 40 (2) 60-63 (1990)

3. I. Avramov, P. Edmonson, P. Smith, Surface Transverse Wave Based FM Modulator/Demodulator, Electronics Letters, Vol. 26 (6) 364-365 (1990)

4. I. Avramov, High Q Metal Strip Surface Transverse Wave Resonators Using a SAW Design, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 37 (6) 530-534 (1990)

5. I. Avramov, P. Edmonson, P. Smith, Surface Transverse Wave Based MSK System, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 38 (3) 194-198 (1991)

6. I. Avramov, A 1 GHz Low Loss Coupled Resonator Filter Using Surface Skimming Bulk Waves and Bleustein-Gulyaev Waves, Electronics Letters, Vol. 27 (5) 414-415 (1991)

7. I. Avramov, 1 GHz Voltage Controlled Oscillator Using a SSBW/BGW Combined Mode Resonator Filter, Proceedings of the 45-th Annual Frequency Control Symposium AFCS-91, 29-31 May 1991, Los Angeles, USA, (1991) 230-238

8. I. Avramov, Microwave Oscillators Stabilized with Surface Transverse Wave Resonant Devices, Proc. 46-th IEEE Symposium on Frequency Control, Hershey, Pennsylvania, USA, 27-29 May (1992) 391-408

9. I. Avramov, Transmission and Reception of High Fidelity Sound in Buildings Using Surface Transverse Wave Based 1 GHz FM Radio, Proc. IEEE Ultrasonics Symposium, 20-23 October 1992, Tucson, Arizona, USA (1992) 249-252

10. I. Avramov, GHz Range Resonant Devices for Oscillator Applications Using Shear Horizontal Acoustic Waves, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 40 (5) 459-468 (1993)

11. I. Avramov, D. Thompson, Influence of the Metallisation on the Electrical Performance of STW Two-Port Resonators, Proc. 6th Conference with International Participation Acoustoelectronics'93, 19-25 Sept. 1993, Varna, Bulgaria (1993) 193-198

12. I. Avramov, Extremely High Loop Power GHz Range Surface Transverse Wave Oscillators Using AB-Class Amplifiers, Proc. IEEE International Frequency Control Symposium, 1-3 June 1993, Salt Lake City, USA (1993) 728-732

13. S. Denisenko, I. Avramov, Design, Fabrication and Performance of 2 GHz Surface Transverse Wave Resonators, Proc. IEEE International Frequency Control Symposium, 1-3 June 1993, Salt Lake City, USA (1993) 645-649

14. V. Aliev, I. Avramov, Precision Frequency Trimming of SAW and STW Resonators Using Xe Heavy Ion Bombardment, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. (UFFC-41) (5) 694-695 (1994)

15. I. Avramov, Using Surface Transverse Waves to Guard Your Property, Proc. IEEE Ultrasonics Symposium, Nov. 1994, Cannes, France (1994) 203-206

16. I. Avramov, V. Aliev, S. Denissenko, A. Kozlov, 2 GHz Surface Transverse Wave Oscillators. Design, Performance and Limitations, Proc. IEEE International Frequency Control Symposium (1995) 459-468

17. I. Avramov, A High-Performance 1 GHz Surface Transverse Wave Based Receiver for Hand-Held Personal Communications, Proc. Sixth International Conference on “Radio Receivers and Associated Systems”, Bath, UK, 26-28 Sept. (1995) 76-80

18. I. Avramov, F. Walls, T. Parker, G. Montress, Extremely Low Thermal Noise Floor, High Power Oscillators Using Surface Transverse Wave Devices, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 43 (1) 20-29 (1996)

19. I. Avramov, M. Suohai, Surface Transverse Waves Exceed the Material Qlimit for Surface Acoustic Waves on Quartz, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 43 (6) 1133-1135 (1996)

20. I. Avramov, M. Suohai, Liu Wen, Longitudinal Mode Behaviour in Surface Transverse Wave Two-port Resonators, Proceedings of the IEEE International Frequency Control Symposium (1996) 252-260

21. I. D. Avramov, Increasing the Loaded Q of GHz Range Surface Transverse Wave Resonators, Proc. European Frequency and Time Forum, 4-7 March 1997, Neuchatel, Switzerland (1997) 394-398

22. I. Avramov, O. Ikata, T. Matsuda, T. Nishihara, Y. Satoh, Further Improvements of Surface Transverse Wave Two-port Resonator Performance in the 2.0 to 2.5 GHz Range, Proc. IEEE International Frequency Control Symposium, 28-30 May 1997, Orlando, Florida, USA (1997) 807-815

23. M. Taslakov, I. Avramov, Frequency Trimming of Surface Transverse Wave Resonators Using Resistive Evaporation of Thin SiO Dielectric Film”, Proc. IEEE International Frequency Control Symposium, May 27-29, 1998, Pasadena, California, USA (1998) 497-501

24. I. Avramov, O. Ikata, T. Matsuda, Y. Satoh, High-Performance Surface Transverse Wave Based Voltage Controlled Feedback Oscillators in the 2.0 to 2.5 GHz Range, Proc. IEEE International Frequency Control Symposium, 27-29 May 1998, Pasadena, California, USA (1998) 519-527

25. I. Avramov, B. Arneson, R. Lutes, High-Performance 1.244 GHz Narrowband Frequency Modulated (NBFM) Transceiver for Voice Communications Using Surface Transverse Waves, Proc. International Symposium on Acoustoelectronics,Frequency Control and Signal Generation, 7 - 12 June 1998, St. Petersburg, Russia (1998)

26. J. Kosinski, R. Pastore, I. Avramov, Theoretical and Experimental Evidence of Superior Intrinsic Q of STW Devices on Rotated Y-cut Quartz, Proc. Joint Meeting of the 13-th European Frequency and Time Forum and the 1999 IEEE International Frequency Control Symposium, Besancon, France, 13-16 April (1999) 867-870

27. I. Avramov, Characterization of Single-Port Surface Transverse Wave Resonators in the Lower GHz Range, Proc. Joint Meeting of the 13-th European Frequency and Time Forum and the 1999 IEEE International Frequency Control Symposium, Besancon, France, 13-16 April (1999) 863-866

28. E. Radeva, I. Avramov, High-Resolution Humidity Sensing Using Surface transverse Wave (STW) Based Resonant Devices. Applications to Wireless Remote Sensing, Materials Science and Engineering C (12) 71-76 (2000)

29. I. Avramov, High-performance Surface Transverse Wave Resonators in the Lower GHz Frequency Range, Invited paper, Int. Journal of High Speed Electronics and Systems, Vol. 10 (3) 735-792 (2000)

30. I. Avramov, M. Rapp, A. Voigt, U. Stahl, M. Dirschka, Comparative studies on polymer coated SAW and STW resonators for chemical gas sensing applications, Proc. IEEE International Frequency Control Symposium, 7-9 June 2000, Kansas City, USA (2000) 58-65

31. I. Avramov, S. Kurosawa, M. Rapp, P. Krawczak, E. Radeva, Investigations on Plasma Polymer Coated SAW and STW Sensors for Chemical Gas-Sensing Applications, IEEE Transactions on Microwave Theory and Techniques, Vol. 49 (4) 827-837 (2001)

32. I. Avramov, M. Rapp, S. Kurosawa, P. Krawczak, E. Radeva, Gas Sensitivity Comparison of Polymer Coated SAW and STW Resonators Operating at the Same Acoustic Wave Length, in IEEE Sensors Journal, Vol. 2 (3) 150-159 (2002)

33. I. Avramov, A High-Performance 2.488 GHz Surface Transverse Wave Based Voltage Controlled Oscillator without Using Submicron Geometries, in Proc. IEEE International Frequency Control Symposium, 29-31 May 2002, New Orleans, USA (2002) 590 - 598

34. I. Avramov, Analysis and Design of Negative Resistance Oscillators Using Surface Transverse Wave Based Single Port Resonators, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. (UFFC-50) (3) 220-229 (2003)

35. I. Avramov, The RF-Powered Surface Wave Sensor Oscillator - a Successful Alternative to Passive Wireless Sensing, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. (UFFC-51) (9) 1148-1156 (2004)

36. I. Avramov, Low Voltage Surface Transverse Wave Oscillators for the Next Generation CMOS Technology, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 52 (8) 1247-1252 (2005)

37. I. Avramov, Phase Noise Reduction in Surface Wave Oscillators by Using Nonlinear Sustaining Amplifiers, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 53 (4) 707-715 (2006)

38. K. Esmeryan, I. Avramov, E. Radeva, Temperature-frequency characteristics of haxamethyldisiloxane (HMDSO) polymer coated Rayleigh surface acoustic wave (SAW) resonators for gas-phase sensor applications, Micromachines (3) 413-426 (2012)

39. I. Avramov, K. Esmeryan, Thermal sensitivity of solid polymer coated surface transverse / Love wave based resonators on AT-cut quarz for sensor applications, Sensors and Transducers (147) 15-26 (2012)

40. N. Andrews, Shen Jen, B. Hartmann, V. Plessky, P. Hartmann, I. Avramov, B. Abbott, In memoriam: Clinton Hartmann, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 60(4) 655-6 (2013)

41. I. Avramov, K. Esmeryan, Thermal sensitivity of solid polymer coated surface transverse. Love wave based resonators on AT-cut quartz for senzor applications, Sensors and Transducers Journal, v. 147 (12) 15-26 (2013)

42. K. Esmeryan, I. Avramov, E. Radeva, Temperature behavior of solid polymer film coated quarz crystal microbalance for sensor applications, Sensors and Actuators B Chemical (216) 240-246 (2015)

43. K. Esmeryan, E. Radeva, I. Avramov, Durable superhydrophobic carbon soot coating for sensor applications, Journal of Physics D Applied Physics (49) 025309 (2016)

44. V. Strashilov, G. Alexieva, G. Tsutsumanova, I. Kolev, I. Avramov, Gas adsorption on ZnO nanowires as studied by surface acoustic wave resonators, Bulgarian Chemical Communications, 48 (1) 134-140 (2016)

45. I. Avramov, U. Stahl, On the mass sensitivity of Rayleigh surface acoustic wave (RSAW) resonators, 40th International Spring Seminar on Electronics Technology (ISSE) (2017)

46. I. Avramov, E. Radeva, K. Esmeryan, Metod za stabilizacia na svrahhidrofobno pokritie ot vaglerodni sajdi, Patent 66950 B1, avgust 2019, Bulgaria

47. G. Ivanov, I. Avramov, Langmuir – Blodgett Films from Fluorescently Labeled Phospholipids on Surface Acoustic Wave Devices. 20th International School on Condensed Matter Physics, Journal of Physics: Conference Series (JPCS), 1186 (2019) 012007

48. G. Ivanov, I. Avramov, V. Strijkova, Y. Marinov, T. Vlakhov, E. Bogdanova, G. Hadjichristov, Mass sensitivity of Langmuir-Blodgett monolayer film coated surface acoustic wave resonators to volatile organic solvents. Journal of Physics, Condensed Matter, Conference Series, IOP Conference Series, (2020)

49. I. Avramov, E. Radeva, Y. Lazarov, T. Grakov, L. Vergov, Sensitivity Enhancement in Plasma Polymer Films for Surface Acoustic Wave Based Sensor Applications. Coatings, Volume 11, Issue 10, (2021)

50. I. Avramov, The Quartz Surface Microbalance - a Possible Candidate for Rapid Respiratory Virus Detection. 2021 IEEE, International Symposium on Applications of Ferroelectrics (ISAF), IEEE Explore, 2021

51. G. Ivanov, I. Avramov, V. Strijkova, Y. Marinov, T. Vlakhov, E. Bogdanova, G. Hadjichristov, Mass sensitivity of Langmuir-Blodgett monolayer film coated surface acoustic wave resonators to volatile organic solvents. Journal of Physics: Conference Series, 1762, 2021

52. I. Avramov, E. Radeva, Y. Lazarov, T. Grakov, L. Vergov, Sensitivity Enhancement in Plasma Polymer Films for Surface Acoustic Wave Based Sensor Applications, Coatings 11 (10) 1193 (2021)

53. I. Gorbachev, A. Smirnov, G. Ivanov, I. Avramov, E. Datsuk, T. Venelinov, E. Bogdanova, V. Anisimkin, V. Kolesov, E. Kuznetsova, Langmuir-Blodgett Films of Arachidic and Stearic Acids as Sensitive Coatings for Chloroform HF SAW Sensors, Sensors 23 (1) 100 (2023) 1-20