Kazimierz “Kai” Siwiak, Ph.D., P.E., Life Senior Member of IEEE, earned a PhD from the Electrical Engineering Department of Florida Atlantic University, and both the MSEE and BSEE degrees from the Polytechnic Institute of Brooklyn (now New York University Tandon School of Engineering). 

He served as an expert consultant on wireless technologies, antennas, radiation, propagation, electromagnetics, RF safety, intellectual property, and ultra-wideband (UWB) signaling. Dr. Siwiak contributed extensively to technical standards development organizations including in IEEE802 and ITU-R. He authored several engineering text books, many text book chapters, and numerous peer-reviewed technical papers. He was named “Dan Noble Fellow” by Motorola in recognition of his award-winning patents and publications, “Presenter of the Year,” by IEEE West Palm Beach Section, won Motorola’s “Patent of the Year Award,” and multiple Global Standards “Impact Awards”. His earlier papers were abstracted in antenna engineering handbooks, while another was designated “Paper of the Year” by the IEEE Vehicular Technology Society. Dr. Siwiak has more than 40 issued US patents. He founded TimeDerivative, Inc. in 2003, is a registered Professional Engineer in the State of Florida, and served as graduate (PhD and MSEE level) advisor at Florida Atlantic University, Florida International University, and at the National University of Singapore.

Dr. Siwiak is Editor of QEX, the ARRL forum for communications and experimenters, and Contributing Editor of QST. He holds an Extra Class amateur radio operator license, KE4PT, and has been licensed since 1964. He is a life member of AMSAT, and member of ARRL where he’s served on the ARRL RF Safety Committee for more than two decades. He was a team member of SAREX (Space Amateur Radio Experiment) for several decades.

His other interests include flying (commercial pilot, with multiengine and instrument ratings) and operating at low power levels from portable and remote locations.

*    K. Siwiak, SunCam Course 097, Cell Phone and RF Exposure Awareness, Online: <http://www.suncam.com/continuing-education/100214.html >, 30 August 2010.
*    K. Siwiak, Loop Sections of Chapter 5, ARRL Antenna Book, 24th Edition, ARRL, Editor H. Ward Silver, NØAX Newington CT, 2019.
*    K. Siwiak and Y.n Bahreini, Radiowave Propagation and Antennas for Personal Communications, 1st 2nn and 3rd Editions, Norwood, MA: Artech House, 2007.
*    K. Siwiak, “Loop Antennas,” in Encyclopedia of RF and Microwave Engineering, New York, NY: John Wiley & Sons, 2004.
*    K. Siwiak, “Loop Antennas,” in John G. Proakis (Ed.), Wiley Encyclopedia of Telecommunications, New York, NY: John Wiley & Sons, 2002, pp 1290-1299.
*    K. Siwiak, “Chapter 2  - RF Fundamentals,” in E. Hare (Ed.), RF Exposure and You, Newington, CT: ARRL, 1998.
*    K. Siwiak, Radiowave Propagation and Antennas for Personal Communications, Second Edition, Norwood, MA: Artech House, 1998.
*    Listed Contributor: “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields, FCC OET Bulletin 65 and Supplement B, Edition 97-01.
*    K. Siwiak, and R. Quick, “Small Gap-resonated HF Loop Antenna Fed by a Secondary Loop”, QEX, July/Aug. 2018, pp 12-17, also in , QST, Sep. 2018, pp 30-33.
*    K. Siwiak, “RF Exposure Compliance Distances for Transmitting Loops, and Transmitting Loop Current” (Technical Correspondence), QST May 2017, pp 64-65.
*    K. Siwiak, Q and the Energy Stored Around Antennas, QST, Feb 2013, pp 37-38.
*    K. Siwiak, “Technical Correspondence: Loop-High Power, reply to: An antenna idea for antenna restricted communities (Nov. 2011)”, QST, Mar 2012, p 54.
*    H.-H. Chao, E. Lule, T. Babij, and K. Siwiak, “Numerical Characterization of SAR in the Human Head Due to an Ultra-wideband Antenna,” Progress in Electromagnetics Research Symposium (PIERS 2008), Hangzhou, China, March 24–28, 2008.
*    K. Siwiak, “Ultra-Wide Band Radio: Introducing a New Technology, Invited Plenary Session Paper, Conference Proceedings of the IEEE VTC-2001, Rhodes, Greece, May 6-9, May 2001.
*    C. Chen, T. M. Babij, K. Siwiak, “FDTD analysis of scattering of electromagnetic fields close to phantom humans,” 1996 IEEE AP/S International Symposium and URSI Radio Science Meeting, Baltimore MD, 21-26 July 1996.
*    T. M. Babij, K. Siwiak, D. Yip, K. Zeng, “Accuracy of near-field measurements involving phantom humans on open field test sites,” pp 589-592, Electricity and Magnetism in Biology and Medicine, M. Blank, Ed., San Francisco Press, ISBN 0-911302-67-0, 1993.
*    K. Siwiak, T. Babij, K. Zeng, D. Yip, “Computer simulations and measurements of electromagnetic fields close to human phantoms,” pp 603-608, Electricity and Magnetism in Biology and Medicine, M. Blank, Ed., San Francisco Press, ISBN 0-911302-67-0, 1993.
*    K. Siwiak, W. M. Elliott III, “Use of simulated human bodies in pager receiver sensitivity measurements,” Southcon/92, 11 Mar. 1992, Orlando, FL.
*    L. Ponce de Leon, K. Siwiak, “Analysis of simulated human body test devices used in pager receiver measurements,” Southcon/92 Conference Record, 11 March 1992, Orlando, FL.
*    T. M. Babij, K. Siwiak, K. Zeng, “Computer simulations and analysis of the near field of conducting cylinder representation of human bodies,” Southcon/92 Conference Record, 11 March 1992, Orlando, FL.
*    Q. Balzano, K. Siwiak, “Radiation from Annular Antennas,” Correlations, An Engineering bulletin from Motorola Inc., Schaumburg IL, Volume VI, Number 2, Winter 1987.
*    Q. Balzano, K. Siwiak, “The Near Field of Annular Antennas,” IEEE Transactions on Vehicular Technology, Vol. VT36, No. 4, Nov.1987.
*    K. Siwiak, Q. Balzano, “Radiation from Annular Antennas,” 1986 IEEE/VTS Conference, pp 15-25, IEEE Cat. No. 86CH2308-5.
*    Q. Balzano, O. Garay, K. Siwiak, “The Near Field of Omnidirectional Helices,” IEEE Transactions on Vehicular Technology, Vol. VT-31, No. 4, November 1982.
*    Q. Balzano, O. Garay, K. Siwiak, “The Near Field of Dipole Antennas, Part 1,” IEEE Transactions on Vehicular Technology, Vol. VT-30 No. 4, November, 1981.
*    Q. Balzano, O. Garay, K. Siwiak, “The Near Field of Dipole Antennas, Part 2,” IEEE Transactions on Vehicular Technology, Vol. VT-30 No. 4, November, 1981.
*    K. Siwiak, Q. Balzano, O. Garay, S. Patsiokas, “Evaluation of the Electric Field in Close Proximity to Current Sources,” Third Annual Conference of the Bioelectromagnetics Society, Aug. 9-12, 1981, Washington, DC.