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Office of the Chief Scientist and Chief Technologist


William A. Imbriale's Picture
Jet Propulsion Laboratory
M/S 238-737
4800 Oak Grove Dr.
Pasadena, CA 91109

William A. Imbriale

William A. Imbriale received a B.S. degree in engineering physics from Rutgers University in 1964; an M.S. degree in electrical engineering from the University of California, Los Angeles, in 1966; and a Ph.D. degree from the University of Illinois in 1969.

Dr. Imbriale is a senior research scientist in the Communications Ground System Section at the Jet Propulsion Laboratory (JPL), in Pasadena, California. Since starting at JPL in 1980, he has led many advanced technology developments for large ground-station antennas, lightweight spacecraft antennas, and millimeter-wave spacecraft instruments. He is currently on Sabbatical at Cornell University working on the Square Kilometer Array, the next generation radio telescope. He has recently completed a technology contract for the Earth Sciences Technology Office (ESTO) to develop a subreflector consisting of MEMS switches integrated with patch reflect array elements that will compensate, in real time, for on-orbit distortions of a membrane inflatable antenna. He was also the lead engineer for the Spanish supplied High Gain Antenna System for the Mars Science Laboratory (MSL) rover. In 2002 he was on a sabbatical at CSIRO in Australia where he worked with the Australian Telescope National Facility. He has also worked on the Deep Space Network Large Array, a concept to significantly increase the capability of the Deep Space Network (DSN) by arraying a large number of inexpensive small antennas. He has developed technologies to enable the use of Ka-band frequencies on NASA’s Deep Space Network 70-meter antennas, by overcoming the substantial gain loss due to gravity-induced distortions as a function of elevation angle.

Previously, Dr. Imbriale served as the assistant manager for microwaves in the Ground Antennas and Facilities Engineering Section, where he was responsible for all technical activities associated with radio frequency (RF) design and development of large ground-based antennas of the DSN. In 1991, he accepted a six-month temporary assignment as a foreign research fellow at the Institute of Space and Astronautical Science in Japan, where he worked on mesh deployable spacecraft antennas and beam-waveguide ground antennas.

During the 1980s, Dr. Imbriale managed the Radio Frequency and Microwave Subsystem Section, which was responsible for the research, development, and implementation of RF and microwave subsystems used in the DSN. He was manager during the critical period of equipment delivery for DSN support to NASA’s Voyager mission, which required upgrades to virtually all telecommunications subsystems. He has published two books in the JPL Monograph series on Deep Space Communications and Navigation. One (Imbriale, Large Antennas of the Deep Space Network, John Wiley and Sons, 2003) that documents the antennas of NASA’s Deep Space Network (DSN) form the network’s inception in 1958 to the present and the second (Imbriale, Spaceborne Antennas for Planetary Exploration, John Wiley and Sons, 2006) that documents the antennas that have flown on JPL spacecraft or were used for JPL scientific instruments that have flown on other spacecraft.

Prior to joining JPL, Dr. Imbriale was employed at TRW, in the Defense and Space Systems Group, where he was the subproject manager for antennas in the Tracking and Data Relay Satellite Systems (TDRSS) program.

Dr. Imbriale is a fellow of the IEEE; a member of the International Union of Radio Science Commission B; and a member of the Sigma Xi, Tau Beta Pi, and Eta Kappa Nu honor societies. He has received numerous NASA honor awards, including the Exceptional Service Medal. From 1993 through 1995, he was a distinguished lecturer for the Antennas and Propagation Society, speaking on beam-waveguide antennas and the evolution of the Deep Space Network antennas. He has published extensively and has won three best paper awards. He was a member of the Administration Committee of the IEEE Antennas and Propagation Society and general chairman of the 1995 International IEEE Antennas and Propagation International Symposium, held in Newport Beach, California. He has lectured and taught engineering courses at several learning institutions, including the University of California, Los Angeles and the University of Southern California. He is also a consultant to industry on all aspects of antenna analysis and design.

Research Interests
  • Spacecraft and Ground Antennas
  • Radio Astronomy Telescopes
  • Millimeter and Submillimeter Instruments

  • Selected Awards
    Best Paper Awards
  • V. D. Agrawal and W. A. Imbriale, “Design of a Dichroic Cassegrain Subreflector,” IEEE Transactions on Antennas and Propagation, vol. AP-27, pp. 466–473, July 1979.
  • W. A. Imbriale, V. Galindo, and Y. Rahmat-Samii, “On the Reflectivity of Complex Mesh Surfaces,” IEEE Transactions on Antennas and Propagation, vol. AP-39, pp. 1352–1365, September 1991.
  • M. Brenner, M. J. Britcliffe, W.A. Imbriale, “Gravity Deformation Measurements of 70m Reflector Surfaces,” Antenna Measurement Techniques Association 2001 Conference, Denver, Colorado, October 21–26, 2001.

  • Selected Publications
    1. W. A. Imbriale and R. E. Hodges, “The Linear Phase Triangular Facet Approximation in Physical Optics Analysis of Reflector Antennas,” Applied Computational Electromagnetic Society, vol. 6, no. 2, pp. 74–85, Winter 1991.
    2. V. Galindo-Israel, W. A. Imbriale, and R. Mittra, “On the Theory and Synthesis of Single and Dual Offset Shaped Reflector Antennas,” IEEE Transactions on Antennas and Propagation, vol. AP-35, no. 8, pp. 887– 896, August 1987.
    3. W. A. Imbriale and P. G. Ingerson, “On Numerical Convergence of Moment Solutions of Moderately Thick Wire Antennas using Sinusoidal Basis Functions,” IEEE Transactions on Antennas and Propagation, vol. AP-21, pp. 363–366, May 1973.
    4. W. A. Imbriale, “Applications of the Method of Moments to Thin-Wire Elements and Arrays,” Chapter 2 in Topics in Applied Physics, vol. 3, Numerical and Asympotic Techniques in Electromagnetics, Editor: R. Mittra, Springer-Verlag, Berlin, Germany, and New York, New York, 1975.
    5. W. A. Imbriale, “Phased Arrays for Satellites and the TDRSS Antennas,” Satellite Communication Antenna Technology, Proceedings of the Summer School University of Technology (Eindhoven, The Netherlands, August 23–27, 1982), R. Mittra, W. A. Imbriale, and E. J. Maanders, editors, Elsevier Science Publishers, North-Holland, Amsterdam, the Netherlands, pp. 431–486, 1983.
    6. J. Randolph, J. Ayon, G. Harvey, W. Imbriale, R. Miyake, R. Mueller, B. Nesmith, P. Turner, R. Dirling, S. Rawal, and W. Vaughn, “The Solar Probe Mission and System Design History,” American Institute of Physics Proceedings, vol. 387, p. 123, 1997.
    7. W. Imbriale, J. Randolph, and E. Embuido, “The Solar Probe Antenna,” IEEE International Symposium on Antennas and Propagation (Monterey, California), pp. 3007–3010, June 2004.
    8. W. A. Imbriale and D. J. Hoppe, “Computational Techniques for Beam Waveguide Systems,” 2000 IEEE Antennas and Propagation International Symposium, Salt Lake City, Utah, pp. 1894–1897, July 16–21, 2000.
    9. W. A. Imbriale and D. J. Hoppe, “Recent Trends in the Analysis of Quasioptical System,” AP2000 Millennium Conference on Antennas and Propagation, Davos, Switzerland, April 9–14, 2000.
    10. A. G. Cha and W. A. Imbriale, “A New Analysis of Beam Waveguide Antennas Considering the Presence of the Metal Enclosure,” IEEE Transactions on Antennas and Propagation, vol. 40, no. 9, pp. 1041–1046, September 1992.
    11. W. A. Imbriale, “On the Calculation of Noise Temperature in Beam Waveguide Systems,” Proceedings of the International Symposium on Antennas and Propagation, Chiba, Japan, pp. 77–80, September 24–27, 1996.
    12. W. A. Imbriale, T. Y. Otoshi, and C. Yeh, “Power Loss for Multimode Waveguide and Its Application to Beam-Waveguide Systems,” IEEE Transaction on Microwave Theory and Techniques, vol. 46, no. 5, pp. 523–529, May 1998.
    13. W. A. Imbriale, “Design and Applications of Beam Waveguide Systems,” 1997 IEEE Aerospace Conference, vol. 3, Snowmass, Colorado, pp. 121–134, February 1–8, 1997.
    14. T. Veruttipong, J. R. Withington, V. Galindo-Israel, W. A. Imbriale, and D. Bathker, “Design Considerations for Beam-waveguide in the NASA Deep Space Network,” IEEE Transactions on Antennas and Propagation, vol. AP-36, no. 12, pp. 1779–1787, December 1988.
    15. W. A. Imbriale and J. S. Esquival, “A Novel Design Technique for Beamwaveguide Antennas,” 1996 IEEE Aerospace Applications Conference Proceedings, vol. 1, Aspen, Colorado, pp. 111–127, February 3–10, 1996.
    16. W. A. Imbriale, M. S. Esquivel, and F. Manshadi, “Novel Solutions to Low-frequency Probelms with Geometrically Designed Beam-waveguide systems,” IEEE Transactions on Antennas and Propagation, vol. 46, no. 12, pp. 1790–1796, December 1998.
    17. W. A. Imbriale, D. J. Hoppe, M. S. Esquivel, and B. L. Conroy, “A Beamwaveguide Design for High-Power Applications,” Intense Microwave and Particle Beams III, proceedings of the SPIE meeting, Los Angeles, California, pp. 310–318, January 20–24, 1992.
    18. T. Veruttipong, V. Galindo-Israel, and W. A. Imbriale, “Low-Loss Offset Feeds for Electrically Large Symmetric Dual-Reflector Antennas,” IEEE Transactions on Antennas and Propagation, vol. AP-35, no. 7, July 1987.
    19. V. Galindo-Israel, S. R. Rengarajan, W. Veruttipong, and W. A. Imbriale, “Design of a Correcting Plate for Compensating the Main Reflector Distortions of a Dual Shaped System,” IEEE Antennas and Propagation Society International Symposium, Ann Arbor, Michigan, pp. 246–249, June 1993.
    20. W. A. Imbriale, M. Moore, D. J. Rochblatt, and W. Veruttipong, “Compensation of Gravity-Induced Structural Deformations on a Beam-Waveguide Antenna Using a Deformable Mirror,” IEEE Antennas and Propagation Society International Symposium 1995, Newport Beach, California, pp. 1680–1683, June 1995.
    21. R. Bruno, W. Imbriale, M. Moore, and S. Stewart, “Implementation of a gravity compensating mirror on a large aperture antenna,” AIAA Multidisciplinary Analysis and Optimization, Bellevue, Washington, September 1996.
    22. S. R. Rengarajan, W. A. Imbriale, and P. W. Cramer, Jr., “Design of a Deformed Flat Plate to Compensate the Gain Loss Due to the Gravity- Induced Surface Distortion of Large Reflector Antennas,” International Symposium on Electromagnetic Theory, Thessaloniki, Greece, May 1998, pp. 124–126.
    23. B. L. Conroy, D. J. Hoppe, and W. A. Imbriale, “Broadband Venetian Blind Polarizer with Dual Vanes,” International Journal of Infared and Millimeter Waves, vol. 14, no. 5, pp. 897-996, May 1993.

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