Karel Hoffmann

Karel Hoffmann
Karel Hoffmann
profesor•T2: B2-632••2 2435 2276
Stav tohoto uživatelského účtu je Schválené

Tento uživatel nemá prozatím vyplněny žádné údaje.

Karel Hoffmann received his Ing. (with honors) and Ph.D. degrees from the Czech Technical University in Prague, Czech Republic, in 1974 and 1981, respectively. In 1990 and 1991, he spent four months with the University Tor Vergata, Rome, Italy, where he was involved with research on precise microwave measurement correction methods. From 1994 to 2002, he was an Associate Professor with the Faculty of Electrical Engineering, Czech Technical University. Since 2002, he has been a Full Professor with the same institution.

Na katedře elektromagnetického koordinuje aktivity související zejména s mikrovlnným měřením a vývojem planárních mikrovlnných zařízení. Mezi jeho hlavní aktivity patří návrh aktivních i pasivních mikrovlnných integrovaných obvodů, precizní mikrovlnná měření a modelování mikrovlnných komponent. V posledních letech se soustřeďuje na vývoj nových interferometrických měřicích metod pro měření extrémních impedancí, vzdáleností a jejich aplikace ve skenovacích mikrovlnných mikroskopech.

IEEE MTT, ARFTG Technical Programme Committee

Věnuje se výuce předmětů A0M17MMS - Mikrovlnné měřicí systémy, A2M17MOS - Mikrovlnné obvody a subsystémy a A2B17VFM - Vysokofrekvenční měření. Vychoval řadu doktorandů, kteří úspěšně obhájili doktorské práce.

2013-2016 EMRP RESEARCHER GRANT CONTRACT NO. SIB62-REG1 Researcher Excellence Grant (REG) in reference to JRP: SIB62 HFCircuits.

2015-2017 TAČR TH - Program na podporu aplikovaného výzkumu a experimentálního vývoje EPSILON "Mikrovlnný měřič tloušťky kovového pásu pro dělicí linky "

2016-2020  Marie Curie 675683 — CELTA — H2020-MSCA-ITN-2015/H2020-MSCA-ITN-2015

  • Hoffmann,K., Sokol,V.; Škvor,Z.; “Arbitrary Q-Factor Dielectric Resonator”, Radioengineering, December 2001, vol. 10, no. 4, pp. 21-23. (pdf)
  • Hoffmann,K., Vajtr,J.; “Solenoid above Ground Plane - Equivalent Circuit”, Radioengineering, December 2001, vol. 10, no. 4, pp. 17-20. (pdf)
  • Sokol,V., Hoffmann,K., Vajtr,J.; “Noise Figure Measurement of Highly Mismatched DUT”, Radioengineering, September 2003, vol. 12, no. 3, pp. 13-15. (pdf)
  • Sokol,V., Černý,P., Hoffmann,K., Škvor,Z.; “Assembly Influence on the Small-Signal Parameters of a Packaged Transistor”, Radioengineering, December 2005, vol. 14, no. 4, pp. 75-80. (pdf)
  • Závodný,V., Hoffmann,K., Škvor,Z.; “Seven State PTP for Vector Network Analyzer”, Radioengineering, December 2005, vol. 14, no. 4, pp. 87-90. (pdf)
  • Hudec,P., Polívka,M., Pechač,P.; “Microwave System for the Detection and Localization of Mobile Phones in Large Buildings”, Microwave Theory and Techniques, IEEE Transactions on, vol.53, no.6, pp. 2235- 2239, June 2005. (IEEEXplore)
  • Zela,J., Hoffmann,K., Hudec,P.; “Errors in Measurement of Microwave Interferograms Using Antenna Matrix”, Radioengineering, Semptember 2008, vol. 17, no. 3, pp. 25-32. (pdf)
  • Randus,M., Hoffmann,K.; “A Method for Direct Impedance Measurement in Microwave and Millimeter-Wave Bands”, Microwave Theory and Techniques, IEEE Transactions on, vol.59, no.8, pp. 2123-2130, Aug. 2011. (IEEEXplore)
  • Randus,M., Hoffmann,K.; “Microwave Impedance Measurement for Nanoelectronics”, Radioengineering, March 2011, vol. 20, no. 1, pp. 276-283. (pdf)
  • Morávek,O., Hoffmann,K.; "Improvement to Load-pull Technique for Design of Large-signal Amplifier in K Band", Radioengineering, December 2011, vol. 20, no. 4, pp. 828-831. (pdf)
  • Morávek,O.; Hoffmann,K.; "Measurement and Simulation of Coaxial to Microstrip Tansitions' Radiation Properties and Sbstrate Influence", Radioengineering, June 2012, vol. 21, no. 2, p. 568-572. (pdf)
  • Morávek,O.; Hoffmann,K., "Radiation properties of Coaxial-to-coplanar transitions in K band", In: Electronics Letters. 2012, vol. 48, no. 16, p. 1003-1004. (IEEEXplore)
  • Příhoda, M.; Hoffmann, K., "Novel Multimode Planar Absorbing Structure," IEEE Microwave and Wireless Components Letters. 2013, vol. 23, no. 1, p. 7-9. ISSN 1531-1309. (IEEEXplore)
  • Příhoda, M.; Hoffmann, K., "Self-calibrating evaluation method for microwave interferometry measurements," Electronics Letters. 2013, vol. 49, no. 49(5), p. 356-358. ISSN 0013-5194. (IEEEXplore)
  • Moravek, O.; Hoffmann, K.; Polivka, M.; Jelinek, L., "Precise Measurement Using Coaxial-to-Microstrip Transition Through Radiation Suppression," Microwave Theory and Techniques, IEEE Transactions on , vol. 61, no. 8, pp. 2956 - 2965. (IEEEXplore)
  • Adler, V.; Hoffmann, K., "Six-Port Spatial Electromagnetic Wave Measurement," Microwave Theory and Techniques, IEEE Transactions on, December 2014, vol. 62, no. 12, pp 3161 - 3171. (IEEEXplore)
  • Haase, M.; Hoffmann, K.; Hudec, P., "General Method for Characterization of Power-Line EMI/RFI Filters Based on S-Parameter Evaluation," October 2016, IEEE Transactions on Electromagnetic Compatibility, vol. 58, no. 5, pp. 1465 - 1474. (IEEEXplore)
  •  Haase, M.; Hoffmann, K.; Hudec, P., "Advanced Evaluation of Minimum Insertion Loss of Power-Line EMI/RFI Filters in RF and Microwave Frequency Bands,"  December 2017, IEEE Transactions on Electromagnetic Compatibility, vol. 59, no. 6, pp. 1887-1896. (IEEEXplore)
  • Aleksandra Baskakova ; Karel Hoffmann, IEEE Microwave and Wireless Components Letters, Volume: 29 , Issue: 2 , Feb. 2019, pp. 86-88.(pdf)