John Ward's Publications List

• John S. Ward, Jonas Zmuidzinas, Andrew I. Harris, and Kate G. Isaak, A ¹²CO J = 6-5 Map of M82: The Significance of Warm Molecular Gas, The Astrophysical Journal, 587: 171-185, 2003 April 10.

• John S. Ward, Observations of Carbon Monoxide in the Starburst Galaxy M82 with a 690 GHz Wide Spectral Bandwidth Receiver, Ph.D. Thesis, California Institute of Technology, 2002.

• J. Ward, D. Miller, J. Zmuidzinas, P. O'Brien, H. G. LeDuc, R. Bicknell-Tassius, A 4-8 GHz Quasi-MMIC IF Amplifier for a 690 GHz SIS Receiver, Proceedings, Eleventh International Symposium on Space Terahertz Technology, pp. 570-581, 2000.

• J. Ward, F. Rice, G. Chattopadhyay, and J. Zmuidzinas, SuperMix: A Flexible Software Library for High-Frequency Circuit Simulation, Including SIS Mixers and Superconducting Elements, Proceedings, Tenth International Symposium on Space Terahertz Technology, pp. 268-281, 1999.

• F. Rice, J. Ward, J. Zmuidzinas, G. Chattopadhyay, Fast Harmonic Balance of SIS Mixers with Multiple Junctions and Superconducting Circuits, Proceedings, Tenth International Symposium on Space Terahertz Technology, pp. 282-297, 1999.

• J.C. Pearson, I. Mehdi, E. Schlecht, F. Maiwald, A. Maestrini, J. Gill, S. Martin, D. Pukala, J. Ward, J. Kawamura, W.R. McGrath, W.A. Hatch, D. Harding, H.G. LeDuc, J.A. Stern, B. Bumble, L. Samoska, T. Gaier, R. Ferber, D. Miller, A. Karpov, J. Zmuidzinas, T. Phillips, N. Erickson, J. Swift, Y.-H. Chung, R. Lai, and H. Wang, THz Frequency Receiver Instrumentation for Herschel's Heterodyne Instrument for Far Infrared (HIFI), Proceedings SPIE, Astronomical Telescopes and Instrumentation, Waikoloa, Hawaii, 22-28 August 2002.

• John Ward, Frank Maiwald, Goutam Chattopadhyay, Erich Schlecht, Alain Maestrini, John Gill, and Imran Mehdi, 1400 - 1900 GHz Local Oscillators for the Herschel Space Observatory, Proceedings, Fourteenth International Symposium on Space Terahertz Technology, pp. 94-101, Tucson, Arizona, 2003.

• A. Maestrini, J. Ward, J. Gill, G. Chattopadhyay, F. Maiwald, K. Ellis, H. Javadi, and I. Mehdi, A Planar-Diode Frequency Tripler at 1.9 THz, 2003 IEEE MTT-S International Microwave Symposium Digest, Philadelphia, PA, June 2003.

• Frank Maiwald, Erich Schlecht, John Ward, Robert Lin, Rosa Leon, John Pearson, and Imran Mehdi, Design and Operational Considerations for Robust Planar GaAs Varactors: A Reliability Study, Proceedings, Fourteenth International Symposium on Space Terahertz Technology, 2003.

• G. Chattopadhyay, E. Schlecht, J. Ward, J. Gill, H. Javadi, F. Maiwald, and I. Mehdi, An All Solid-State Broadband Frequency Multiplier Chain at 1500 GHz, IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 5, pp. 1538-1547, May 2004.

• A. Maestrini, J. Ward, J. Gill, H. Javadi, E. Schlecht, G. Chattopadhyay, F. Maiwald, N. R. Erickson, and I. Mehdi, A 1.7 to 1.9 THz Local Oscillator Source, IEEE Microwave and Wireless Components Letters, vol. 14, no. 6, pp 253-255, June 2004.

• J. Ward, E. Schlecht, G. Chattopadhyay, A. Maestrini, J. Gill, F. Maiwald, H. Javadi, and I. Mehdi, Capability of THz Sources Based on Schottky Diode Frequency Multiplier Chain, Proceedings, IEEE MTT-S International Microwave Symposium, Fort Worth, TX, pp. 1587-1590, June 2004.

• Alain Maestrini, John Ward, John Gill, Hamid Javadi, David Pukala, Frank Maiwald, and Imran Mehdi, Design and Performance of Planar Schottky Diode Triplers for Radio Astronomy, IEEE Mediterranean Microwave Symposium, Marseille, France, June 2004.

• John Ward, Goutam Chattopadhyay, Alain Maestrini, Erich Schlecht, John Gill, Hamid Javadi, David Pukala, Frank Maiwald, and Imran Mehdi, Tunable All-Solid-State Local Oscillators to 1900 GHz, Proceedings, Fifteenth International Symposium on Space Terahertz Technology, Amherst, Massachusetts, 2004.

• Frank Maiwald, Erich Schlecht, Robert Lin, John Ward, John Pearson, Peter Siegel, and Imran Mehdi, Reliability of cascaded THz frequency chains with planar GaAs circuits, Proceedings, Fifteenth International Symposium on Space Terahertz Technology, Amherst, Massachusetts, 2004.

• J. C. Pearson, I. Mehdi, J. S. Ward, F. W. Maiwald, R. R. Ferber, H. G. Leduc, E. T. Schlecht, J. J. Gill, W. A. Hatch, J. H. Kawamura, J. A. Stern, T. C. Gaier, L. A. Samoska, S. Weinreb, B. Bumble, D. M. Pukala, H. H. Javadi, B. P. Finamore, R. H. Lin, R. J. Dengler, J. R. Velebir, E. M. Luong, R. Tsang, A. Peralta, M. Wells, W. Chun, J. Zmuidzinas, A. Karpov, T. G. Phillips, D. Miller, A. E. Maestrini, N. Erickson, G. Swift, K. T. Liao, and M. Paquette, "THz instrumentation for the Herschel Space Observatory's Heterodyne Instrument for Far Infrared," Proceedings SPIE, Astronomical Telescopes and Instrumentation, Glasgow, Scotland, June 2004.

• F. Maiwald, J. C. Pearson, J. S. Ward, E. Schlecht, G. Chattopadhyay, J. Gill, R. Ferber, R. Tsang, R. Lin, A. Peralta, B. Finamore, W. Chun, J.J. Baker, R.J. Dengler, H. Javadi, P. Siegel and I. Mehdi, "All-Solid-State Terahertz Sources for Space Applications," Proceedings of The Joint 29th International Conference on Infrared and Millimeter Waves and the 12th International Conference on Terahertz Electronics, Karlsruhe, Germany, September 2004.

• Goutam Chattopadhyay, Imran Mehdi, John S. Ward, Erich Schlecht, Anders Skalare, and Peter H. Siegel, Development of multi-pixel heterodyne array instruments at submillimeter wavelengths, Proceedings, Asia Pacific Microwave Conference, New Delhi, India, December 2004.

• Alain Maestrini, John S. Ward, John J. Gill, Hamid H. S. Javadi, Erich Schlecht, Charlotte Tripon-Canseliet, Goutam Chattopadhyay, and Imran Mehdi, A 540-640 GHz High Efficiency Four Anode Frequency Tripler, IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 9, pp. 2835-2843, September 2005.

• Alain Maestrini, Charlotte Tripon-Canseliet, John S. Ward, John J. Gill, Hamid H. S. Javadi, Erich Schlecht, Goutam Chattopadhyay, and Imran Mehdi, Multiple-Anode Broadband Frequency Triplers at Submillimeter Wavelengths, Proceedings, Sixteenth International Symposium on Space Terahertz Technology, Göteborg, Sweden, May 2005.

• John Ward, Erich Schlecht, Goutam Chattopadhyay, Hamid Javadi, John Gill, and Imran Mehdi, Local Oscillators from 1.4 to 1.9 THz, Proceedings, Sixteenth International Symposium on Space Terahertz Technology, Göteborg, Sweden, May 2005.

• Alain Maestrini, John S. Ward, Hamid Javadi, Charlotte Tripon-Canseliet, John Gill, Goutam Chattopadhyay, Erich Schlecht, and Imran Mehdi, Local Oscillator Chain for 1.55 to 1.75 THz with 100 µW Peak Power, Microwave and Wireless Components Letters, Volume 15, Issue 12, Pages 871 - 873, December 2005.

• John Ward, "New Standards for Submillimeter Waveguides," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• Alain Maestrini, Charlotte Tripon-Canseliet, John S. Ward, John J. Gill, and Imran Mehdi, "A High Efficiency Multiple-Anode 260-340 GHz Frequency Tripler," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• Goutam Chattopadhyay, John S. Ward, Imran Mehdi, and Peter H. Siegel, "TIP: A Terahertz Interferometer for Planets - A Concept Study," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• A.J. Skalare, G. Chattopadhyay, I. Mehdi, J.S. Ward, E.T. Schlecht, and P.H. Siegel, "Heterodyne Array Instruments for Submillimeter Wavelengths," Proceedings SPIE, Astronomical Telescopes and Instrumentation, Orlando, Florida, May 2006.

• I. Mehdi, G. Chattopadhyay, E. Schlecht, J. Ward, J. Gill, F. Maiwald, and A. Maestrini, "Terahertz Multiplier Circuits," 2006 IEEE MTT-S International Microwave Symposium Digest, San Francisco, California, June 2006.

• G. Chattopadhyay, J. Ward, I. Mehdi, and P. Siegel, "Terahertz Sources, Sensors, and Components for Space Applications," Proceedings SPIE, Optics East, Boston, Massachusetts, October 2006.

• Alain Maestrini, John S. Ward, Charlotte Tripon-Canseliet, John J. Gill, Choonsup Lee, Hamid Javadi, Goutam Chattopadhyay, and Imran Mehdi, "In-Phase Power-Combined Frequency Triplers at 300 GHz," IEEE Microwave and Wireless Components Letters, March 2008.