Karl David Stephan Karl D. Stephan, Associate Professor Department of Engineering and Technology Texas State University San Marcos, Texas 78666 512-245-3060 kdstephan@txstate.edu Research Interests: Microwave and millimeter-wave devices and circuits Instructional technology for engineering education History of technology and science Engineering pedagogy (see NSF CCLI project ) Blog: http://engineeringethicsblog.blogspot.com/

Prof. Stephan received the B. S. in Engineering from the California Institute of Technology in 1976. Following a year of graduate study at Cornell, he received the Master of Engineering degree in 1977 and was employed by Motorola, Inc. and Scientific-Atlanta as an RF development engineer. He then entered the University of Texas at Austin's graduate program and received the Ph. D. in electrical engineering in 1983. He taught at the University of Massachusetts Amherst from 1983 to 1999, when he received an NSF Science and Technology Studies Fellowship in the history of technology. He spent the 1999-2000 academic year at the University of Texas at Austin, and in 2000 accepted a position as Associate Professor in the Department of Engineering and Technology at Texas State University, San Marcos, Texas. He has an appointment as Adjunct Associate Research Professor at the University of Texas at Austin's Department of Electrical and Computer Engineering for the 2005-2006 academic year.

Prof. Stephan has published over 25 articles in refereed journals, over 40 conference papers, and six articles in books and encyclopedias. He has consulted for MIT's Lincoln Laboratories and industries in the microwave and millimeter-wave fields. He has collaborated with Prof. John R. Pearce of the University of Texas on a research project to investigate the applications of microwave radiometry for temperature sensing in industrial heating.

Besides his technical research, Prof. Stephan has published historical articles on radioastronomy, microwaves, and refrigeration. He has published several papers on engineering ethics and has served as Treasurer of the IEEE Society on Social Implications of Technology since 2001. He is a senior member of the Institute of Electrical and Electronics Engineers and a member of the Society for the History of Technology.

In teaching, he has developed a graduate-level course in microwave metrology and several undergraduate courses, including a senior design project course and junior-level electronics laboratory projects. As Associate Department Head of his department at the University of Massachusetts during 1996-97, he directed a major curriculum revision of both the EE and the CSE programs. At Texas State University, he teaches engineering ethics as part of an ethics and professionalism course for freshmen.

Selected List of Publications:

1. "Electronics" (12 pages) in 2005 edition of The World Book Encyclopedia.
2. "Microwave Radiometry for Continuous Non-Contact Temperature Measurements During Microwave Heating,” by K. D. Stephan and John A. Pearce, Journal of Microwave Power & Electromagnetic Energy, vol. 40, no. 1, pp. 49-61, 2005.
3. "Radiometry Before World War II,” by K. D. Stephan, IEEE Antennas and Propagation Magazine, vol. 47, no. 6, pp. 28-37, Dec. 2005.
4. "Low-Cost Remote Temperature Sensor for Microwave and RF Heating Using Microwave Radiometry," by K. D. Stephan and John A. Pearce, Journal of Microwave Power & Electromagnetic Energy, vol. 37, no. 2, pp. 113-124, Fall 2002.
5. 1. "A Survey of Ethics-Related Instruction in U. S. Engineering Programs," by K. D. Stephan, ASEE Jour. of Engineering Education, vol. 88, no. 4, pp. 459-464, Oct. 1999 (also see erratum, vol. 89, p. 1, Jan. 2000).
6. K. D. Stephan, "Mary Engle Pennington, Food Refrigeration Engineer," 1996 Am. Soc. for Eng. Education Annual Conference Proceedings, Washington, DC, June 23-26, 1996, paper 3161, 7 pages (CD-ROM proceedings only).
7. K. D. Stephan, "Back to the future: the telegraph as an introduction to electrical and computer engineering," Frontiers in Education 25th Annual Conference, pp. 4a5.8-4a5.11, Atlanta, GA, Nov. 1-4, 1995.
8. K.D. Stephan, "N-rays, super-dielectrics, and microwaves faster than light: improbable discoveries in electromagnetics," IEEE Antennas and Propagation Magazine, vol. 35, no. 3, June 1993, pp. 13-18; reprinted by The Radioscientist and Bulletin, vol. 5, no. 1, Mar. 1994, pp. 3-9.
9. K.D. Stephan, F.H. Spooner, and P.F. Goldsmith, "Quasioptical millimeter-wave hybrid and monolithic PIN-diode switches," IEEE Trans. on Microwave Theory and Techniques, vol. 41, pp. 1791-1798, Oct. 1993.
10. E.R. Brown, C.D. Parker, K.M. Molvar, and K.D. Stephan, "A quasioptically stabilized resonant-tunneling-diode oscillator for the millimeter- and submillimeter-wave regions," IEEE Trans. on Microwave Theory and Tech., vol. 40, pp. 846-850, May 1992.
11. W.A. Morgan, Jr. and K.D. Stephan, "An X-band experimental model of a millimeter-wave interinjection-locked phased array system," IEEE Trans. on Antennas and Propagation, vol. 36, pp. 1641-1645, Nov. 1988.
12. K.D. Stephan, "Inter-injection-locked oscillators for power combining and phased arrays," IEEE Trans. on Microwave Theory and Tech., vol. MTT-34, pp. 1017-1025, Oct. 1986.

Links of Interest:

Engineering Ethics Blog

IEEE Society on Social Implications of Technology

IEEE Virtual Museum, Microwave Section

Society for the History of Technology

A Texan at Harvard: George W. Pierce, Radio Communications Pioneer
(Story provided by Karl D. Stephan)

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