Technical Papers


The qualifications of the Hatfield & Dawson principal engineers are succinctly shown by their comprehensive papers and publications on Medium Wave Antenna and Non-Ionizing Electromagnetic Radiation ("RadHaz") matters.

  • "Computer Simulation of AM Radio Antenna Systems," chapter 4.10 of "NAB Engineering Handbook," 9th Edition, to be published by NAB, 1999.


  • "Computer Analysis of Antenna Systems," by James B. Hatfield, chapter 88, pp.1353 - 1367, of The Electronics Handbook, CRC Press Inc. 1996.


  • "Induced and Contact Currents (ICC) at ICC Workshop," by James B. Hatfield, presented at Brooks Air Force Base, TX, May 21-23, 1996.


  • "Application of MININEC Broadcast Professional for Windows to AM Standard Broadcast Arrays," by James B. Hatfield, presented at Annual Meeting of The Association of Federal Communications Consulting Engineers, May 1996, San Francisco, CA.


  • "New Developments in Moment Method Analysis of Broadcast Antennas," by Dr. Richard Adler and James B. Hatfield, presented at 45th Annual IEEE Broadcast Technology Symposium, September 21,1995.


  • "Protection of Personnel Against Radiofrequency Electromagnetic Radiation," By James B. Hatfield, presented at U.S. Air Force School of Aerospace Medicine, at Brooks Air Force Base, TX, May 1995.


  • "Cellular Towers: Exposure Levels and Public Health," by James B. Hatfield, EMF Health Report, vol.3, No.2, March/April 1995.


  • "Problems with Moment Method Modeling of AM Arrays," by James B. Hatfield, presented at 44th Annual Broadcast Technology Symposium, September 1994.


  • "Nearly Seven Years of Success Using MININEC for Analysis of Standard Broadcast Medium Wave AM Directional Antennas," by James B. Hatfield, presented at ACES Symposium, March 1994.


  • "A Study of AM Tower Base Impedance," by James B. Hatfield, presented at the September 1992 Broadcast Symposium of the Broadcast Technology Society of the IEEE, Washington, DC.


  • "Reciprocity and Moment Methods Applied to Predicting Radiated Emissions" by James B. Hatfield, presented at the March 1991 9th International Zurich Symposium on Electromagnetic Compatibility, Zurich, Switzerland.


  • "Modern Analysis Methods for Medium Wave Antenna Design" by Benjamin F. Dawson III, presented at the International Broadcasting Convention - 1990, of the IEE(UK), Brighton, U.K., September, 1990.


  • "A Modern Method of Predicting AM Tower Vertical Radiation" by James B. Hatfield, presented at the September 1990 Broadcast Symposium of the Broadcast Technology Society of the IEEE, Washington, DC.


  • "Improved Night Interference Protection" by James B. Hatfield, presented at the March 1990 Sixth Annual Conference of the Applied Computational Electromagnetics Society, at the Naval Postgraduate School, Monterey, CA.


  • "Using MININEC to Relate Tower Currents to Fields in an AM Directional Array" by James B. Hatfield, presented at the September, 1989 Broadcast Symposium of the Broadcast Technology Society of the IEEE, Washington, DC.


  • "Analysis of a Sectionalized Tower as an Element in a Medium Wave Phased Array Using the Method of Moments" by Benj. F. Dawson. IEEE Transactions on Broadcasting, vol. 35, No. 2, June 1989.


  • "Relative Tower Currents and Fields in an AM Directional Array" by James B Hatfield. IEEE Transactions on Broadcasting, vol. 35, No. 2, June 1989.


  • "Verifying the Relationships between AM Broadcast Fields and Tower Currents" by James B. Hatfield, presented at the March, 1989 Conference of the Applied Computational Electromagnetics Society, at the Naval Postgraduate School, Monterey, CA.


  • "Analysis of AM Directional Arrays Using Method of Moments" by James B. Hatfield, presented at the April, 1988 Engineering Conference of the National Association of Broadcasters, Las Vegas, NV.


  • "Relationships between Base Drives and Fields in Broadcast Medium Wave Directional Antennas" by James B. Hatfield, presented at the March, 1988 Conference of the Applied Computational Electromagnetics Society, at the Naval Postgraduate School, Monterey, CA.


  • "Numerical Electromagnetic Code Analysis of AM Directional Antenna Nulls and the Proximity Effect" by James B. Hatfield, presented at the September 1987 Broadcast Symposium of the Broadcast Technology Society of the IEEE, Washington, DC.


  • "Sharing AM Transmitter Sites by Diplexing Antenna Systems" by Benj. F. Dawson III, presented at the 1987 Engineering Conference of the National Association of Broadcasters, Dallas, TX.


  • "A Comparison of the Fields of a Medium Wave Directional Antenna as Calculated by the FCC Method and the Numerical Electromagnetic Code" by James B. Hatfield and Paul W. Leonard, presented at the March 1987 Conference of the Applied Computational Electromagnetics Society, at the Naval Postgraduate School, Monterey, CA.

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