Alumni.html

Alumni of the TICS* Research Group
(*TICS: Terahertz Integrated Circuits and Systems)
(*TICS: Telecommunication Integrated Circuits and Systems)

Brief Summary:

George Eleftheriades (Ph.D./EE, February 1993): Assistant Prof. at the Univ. of Toronto, Canada.

Curtis Ling (Ph.D./EE, August 1993): Member of the technical staff at SiliconWave, San Diego.

Walid Ali-Ahmad (Ph.D./EE, September 1993): RF Design System Group Leader, Maxim Co, Sunnyvale, CA.

Steve Mollenkopf (M.S./EE, June 1994): Director of Engineering at QualComm Inc., San Diego, California.

Brian Kormanyos (Ph.D./EE, June 1994): Principal Engineer at Boeing Defense and Space Group, Seattle, Washington.

Steven Gearhart (Ph.D./EE, July 1994): Was an Assistant Professor at the University of Wisconsin, Madison. Is now at the Kellogg School of Business, Northwestern University.

George Dabaghi (M.S./EE, June 1995): Technical Sales Manager, Lucent Technologies, Middle East.

Thomas Budka (Ph.D./EE, July 1995): Senior Design Engineer at RF MicroDevices.

Chen-Yu Chi (Ph.D./EE, August 1995): Senior Engineer at Agilent, Santa Rosa, California.

Daniel Filipovic (Ph.D./EE, September 1995): Senior Engineer at QualComm Inc., San Diego, California.

Sanjay Raman (Ph.D./EE, December 1997): Assistant Professor at Virginia Polytechnic University, Blacksburg, Virginia.

Gildas Gauthier (Ph.D./EE, January 1999): Member of the Technical Staff, Thompson-CSF, Paris, France.

Andrew Brown (Ph.D./EE, April 1999): Head of M-Squared Technologies, Plymouth, MI.

Scott Barker (Ph.D./EE, July 1999): Member of the Technical Staff at the Naval Research Laboratories, Washington, DC.

Leo DiDomenico (Ph.D./EE, August 1999): Member of the Technical Staff of the Jet Propulsion Laboratory, Pasadena, CA.

Thomas Ellis (Ph.D./EE, December 1999): Senior Project Engineer at REMEC Q-bit, Palm Bay, Florida.

Detailed Summary:

George Eleftheriades (Ph.D./EE, February 1993):
"Analysis and Design of Integrated Horn Antennas for Millimeter and Submillimeter-Wave Applications"

George analyzed the integrated horn antenna using a mode matching technique coupled to a method of moment analysis for impedance calculations. He also designed the quasi-integrated horn antenna which has 20-28 dB of gain (depending on the design) and 98% Gaussian coupling efficiency. His work was tested at 90 GHz, 250 GHz and 350 GHz. In his nine months post-doc afterwards, he calculated the self and mutual impedance of slot antennas on infinite dielectrics and did some work on the imaging properties of dielectric lens antennas.

George is an Assistant Prof. at the Univ. of Toronto, Canada.
Electromagnetics Group, Department of Electrical and Computer Engineering, University of Toronto, 10 King's College St., Toronto, Ontario M5S 1A4, Canada, Tel. 416-946-3564, Fax. (416)-978-4425, Email: gelefth@waves.utoronto.ca.

Awards:
First Prize at the Journees Internationales de Nice sur les Antennes (JINA)
W.Y. Ali-Ahmad, G.V. Eleftheriades and G.M. Rebeiz, "Progress in 94 GHz integrated horn antennas," Journees Intl. de Nice sur les Antennes, Nov. 1990.
Second Place at the IEEE Antennas and Propagation Symposium
G.V. Eleftheriades and G.M. Rebeiz, "A systematic approach towards the design of multimode quasi-integrated horn antennas for receiver applications," IEEE AP-S Symp., Chicago, IL, 1992.

Significant Publications:
G.V. Eleftheriades, W.A. Ali-Ahmad, L.P. Katehi and G.M. Rebeiz, "Millimeter-wave integrated horn antennas: Part I: Theory," IEEE Trans. Antennas Propagat., vol. AP-39, pp. 1575-1581, Nov. 1991.
W.A. Ali-Ahmad, G.V. Eleftheriades, L.P. Katehi and G.M. Rebeiz, "Millimeter-wave integrated horn antennas: Part II: Experiment," IEEE Trans. Antennas Propagat., vol. AP-39, pp. 1582-1586, Nov. 1991.
G.V. Eleftheriades and G.M. Rebeiz, "Analysis and design of millimeter-wave quasi-integrated horn antennas" IEEE Trans. Microwave Theory and Tech., vol. MTT-41, pp. 954-965, June/July 1993.
G.V. Eleftheriades and G.M. Rebeiz, "Self and mutual admittance of slot antennas on a dielectric half-space," Int. J. Infrared Millimeter Waves, vol. 14, pp. 1925-1946, Oct. 1993.
G.V. Eleftheriades, A.S. Omar, L.P. Katehi and G.M. Rebeiz, "Some important properties of waveguide generalized scattering matrices in the context of the mode matching technique," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 1896-1903, Oct. 1994.

Curtis Ling (Ph.D./EE, August 1993):
"An Integrated 94 GHz Monopulse Tracking Receiver"

Curtis developed the world's first 94 GHz monopulse receiver using IF monopulse processing. He built the entire receiver using four antennas/mixers and an integrated 23 GHz LO network on the same chip. The antennas were based on the integrated horn, optimized by He achieved a difference null which was better than 30 dB below the sum peak at a 200 MHz IF frequency. Curtis also worked on planar large-area bolometer on thin membranes from 100 GHz to 2.5 THz and developed arrays of these bolometers for use above 300 GHz. These bolometers are excellent power measurement devices at millimeter-wave frequencies.

Curtis is member of the technical staff at SiliconWave, San Diego.
Silicon Wave, 6256 Greenwich Drive, Suite 300, San Diego, CA 92122, Tel: (619) 546-2753.

Significant Publications:
C.C. Ling and G.M. Rebeiz, "A 94 GHz integrated monopulse tracking receiver," IEEE Trans. Microwave Theory Tech., vol. MTT-42, No. 10, pp. 1863-1871, Oct. 1994.
C.C. Ling and G.M. Rebeiz, "94 GHz integrated horn monopulse antennas," IEEE Trans. Antennas Propagat., vol. AP-40, pp. 981-984, Aug. 1992.
C.C. Ling and G.M. Rebeiz, "A wideband monolithic quasi-optical power meter for millimeter-wave and submillimeter-wave applications," IEEE Trans. Microwave Theory Tech., vol. MTT-39, pp. 1257-1261, Aug. 1991.
C.C. Ling, J.C. Landry, H. Davee, G. Chin and G.M. Rebeiz, "Large area bolometers for THz power measurements," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 758-760, Apr. 1994.

Walid Ali-Ahmad (Ph.D./EE, September 1993):
"Millimeter and Submillimeter-Wave Integrated Horn Antenna Schottky Receivers"

Walid built the world's lowest noise room-temperature quasi-optical planar receivers at 86-106 GHz, 240-260 GHz and 330-370 GHz using the quasi-integrated horn antenna and planar Schottky-diodes from the University of Virginia. He also built a dual-polarized array at 94 GHz with 23 dB polarization isolation and a 256-element horn imaging array at 802 GHz. He also helped Daniel Filipovic build a 2.5 THz parabolic reflector with dipole feeds. During his 6-month post-doc, he built a 77 GHz uni-planar automotive receiver using a subharmonic mixer and a double-slot antenna.

Walid is RF Design System Group Leader, Maxim Co, Sunnyvale, CA.
Maxim Integrated Products, 120 San Gabriel Dr., Sunnyvale, CA 94086, Tel: (408) 737-7600, x 2373, Email: Walid_Ali-Ahmad@ccmail.mxim.com.

Awards:
First Prize at the Journees Internationales de Nice sur les Antennes (JINA)
W.Y. Ali-Ahmad, G.V. Eleftheriades and G.M. Rebeiz, "Progress in 94 GHz integrated horn antennas," Journees Intl. de Nice sur les Antennes, Nov. 1990.
Third Place at the IEEE Microwave Theory and Techniques Symposium
W.Y. Ali-Ahmad and G.M. Rebeiz, "A 90 GHz quasi-integrated horn antenna receiver," 1992 IEEE Int. Microwave Symp., Albuquerque, NM, June 1992.

Significant Publications:
W.Y. Ali-Ahmad and G.M. Rebeiz, Gordon Chin and Hermant Davee, "802 GHz integrated horn antennas imaging array," Int. J. Infrared Millimeter Waves, vol. 12, pp. 481-486, May 1991.
W.Y. Ali-Ahmad and G.M. Rebeiz, "92 GHz dual-polarized integrated horn antennas," IEEE Trans. Antennas Propagat., vol. AP-39, pp. 820-825, June 1991.
W.Y. Ali-Ahmad, and G.M. Rebeiz, "An 86-106 GHz quasi-integrated low-noise receiver," IEEE Trans. Microwave Theory Tech., vol. MTT-41, No. 4, pp. 558-564, Apr. 1993.
W.Y. Ali-Ahmad, W.L. Bishop, T.W. Crowe and G.M. Rebeiz, "250 GHz quasi-integrated low-noise Schottky-receiver," Int. J. Infrared Millimeter Waves, vol. 14, pp. 737-748, Apr. 1993.
W.Y. Ali-Ahmad and G.M. Rebeiz, "A 335 GHz integrated Schottky receiver," IEEE Microwave Guided Wave Lett., vol. MGWL-4, pp. 37-39, Feb. 1994.

Brian Kormanyos (Ph.D./EE, June 1994):
"A Subharmonic Mixing Antenna for Millimeter-Wave Receivers and Oscillating Slot Antennas for Quasi-Optical Power Combining'"

Brian did two independent pieces of work. The first one was a wideband 80-200 GHz subharmonic receiver based on the log-periodic antenna and subharmonic mixers. This project was tested with a quasi-optical LO from 40-100 GHz (for subharmonic performance), and an n'th harmonic 20-260 GHZ mixer version with an LO from 10-16 GHz was also developed. The other project was the design of slot-antenna transistor oscillators at 20 GHz and at 155/215 GHz with Hughes Malibu Research Labs. He succeeded in building the highest frequency transistor oscillator in the world ! He also combined a 2x2 array of 20 GHz oscillators on a silicon lens with near 100% combining efficiency.

Brian is Principal Engineer at Boeing Defense and Space Group, Seattle, Washington
Boeing Defense & Space Group, P.O. Box 3999, M/S 3E-36, Seattle, WA 98124-2499, Tel: (206) 657-9099 (W), Fax: (206) 657-8903, Email: briank@titan.ds.boeing.com.

Significant Publications:
B.K. Kormanyos and G.M. Rebeiz, "A 26-220 GHz harmonic-mixer receiver," Microwave J., vol. 36, pp. 103-108, July 1993.
B.K. Kormanyos, P.H. Ostdiek, W.L. Bishop, T.W. Crowe and G. M. Rebeiz, "A planar wideband 80-200 GHz subharmonic receiver," IEEE Trans. Microwave Theory Tech. Special Issue on Quasi-Optical Techniques, vol. MTT-41, pp. 1730-1737, Oct. 1993.
B.K. Kormanyos, W.L. Harokoupos, L.P. Katehi and G.M. Rebeiz," CPW-fed active slot-antennas," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 541-545, Apr. 1994.
B.K. Kormanyos and G.M. Rebeiz, "20 GHz power combining slot-oscillator array," IEEE Trans. Microwave Guided Wave Lett., vol. MGWL-4, pp. 226-228, July 1994.
S.E. Rosenbaum, B.K. Kormanyos, L.M. Jelloian, M. Matloubian, A.S. Brown, L.E. Larson, L. Nguyen, L.P. Katehi and G.M. Rebeiz, "155 GHz and 213 GHz AlInAs/GaInAs/InP HEMT MMIC oscillators," IEEE Trans. Microwave Theory Tech., vol. MTT-43, pp. 927-932, Apr. 1995.

Steve Mollenkopf (M.S./EE, June 1994):
"A 22 GHz MIC Radiometer and Active Receiver"

Steve decided to go to Qualcomm after his M.S. thesis. He developed an 18 GHz subharmonic mixer with a 5-6 dB conversion loss and built a completely planar receiver/radiometer at 22 GHz using three MMIC chips from Martin Marietta Labs, a planar double-folded slot antenna and a planar Schottky diode detector.

Steve is Director of Engineering at QualComm Inc., San Diego, California.
Qualcomm Incorporated, 6455 Lusk Blvd., San Diego, CA 92121-2779, Tel: (619) 658-3328, Fax: (619) 658-1022, Email: smollenkopf@qualcomm.com.

Significant Publications:
S. Mollenkopf, L.P. Katehi and G.M. Rebeiz, "A 20 GHz low-cost MIC active receiver/radiometer," IEEE Trans. Microwave Theory Tech., vol. MTT-43, pp. 989-993, Apr. 1995.

Steve Gearhart (Ph.D./EE, July 1994):
"Integrated Millimeter-Wave and Submillimeter-Wave Antennas and Schottky-Diode Receivers''

Steve first developed the first planar integrated corner-cube antennas and antenna arrays at 220-280 GHz and 2.5 THz. He then worked with Chalmers University of Science and Technology on 380 GHz and 802 GHz tapered slot antennas on thin membranes. He finished his thesis with the fabrication of a very low noise uni-planar double-slot antenna receiver at 250 GHz using integrated Schottky diodes and a double-slot antenna. Steve fabricated the Schottky-diodes himself at UoM solid-state laboratory. He also built a 760 GHz version of the same receiver and helped UVa design and test a 760 GHz log-periodic Schottky-diode receiver.

Steve is an Assistant Professor at the University of Wisconsin, Madison. He is also pursuing his MBA at Northwestern University.
Kellogg Graduate School of Management, Northwestern University, 621 Hinman Avenue, Evanston, IL 60202, Tel: (847) 570-9029, Fax: (847) 570-9040, Email: sgearhart2001@kellogg.nwu.edu.

Awards:
Second Place at the IEEE Microwave Theory and Techniques Symposium
S.S. Gearhart and G.M. Rebeiz, "A monolithic 250 GHz Schottky-diode receiver," IEEE MTT-S Int. Microwave Symp., San Diego, CA, June 1994.

Significant Publications:
S.S. Gearhart, C.C. Ling and G.M. Rebeiz, "Integrated millimeter-wave corner-reflector antennas," IEEE Trans. Antennas Propagat., vol. AP-39, pp. 1000-1006, July 1991.
S.S. Gearhart, C.C. Ling and G.M. Rebeiz, H. Davee and G. Chin, "Integrated 119 um linear corner-cube array," IEEE Microwave Guided Wave Lett., vol. MGWL-1, pp. 155-157, July, 1991.
H. Ekstrom, S.S. Gearhart, P.R. Acharya, G.M. Rebeiz, E.L. Kollberg, S. Jacobsson, "348 GHz endfire slotline antennas on thin dielectric membranes," IEEE Microwave Guided Wave Lett., vol. MGWL-2, pp. 57-358, Aug. 1992.
S.S. Gearhart, J. Hessler, W.L. Bishop, T.W. Crowe and G.M. Rebeiz, "A 760 GHz planar Schottky receiver," IEEE Trans. Microwave Guided Wave Lett., vol. MGWL-3, pp. 205-207, July 1993.
S. S. Gearhart and G. M. Rebeiz, "A monolithic 250 GHz Schottky diode receiver," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 2504-2511, Dec. 1994.

George Dabaghi (M.S./EE, June 1995):
"A 3 GHz Monopulse Processor with Amplitude and Phase Control"

George decided to go to Lucent Technologies after his M.S. Thesis. He developed a planar 3 GHz monopulse processor with amplitude and phase control using COTS equipment. The bandwidth of the processor was around 400 MHz (10%) due to the narrowband nature of some of the COTS couplers and phase shifters.

George is the GSM Technical Sales Manager - Middle East.
Lucent Technologies International Inc., Cell.: +971-50-642-3589, Tel.: +971-2-277-311 ext. 17, Email: gdabaghi@lucent.com

Thomas Budka (Ph.D./EE, July 1995):
"Microwave Circuit Electric Field Imaging Systems"

Tom started his thesis in the mm-wave area and built the first quasi-optical amplifier at 80-110 GHz using a Martin Marietta amplifier and a back-to-back integrated horn antenna. He then moved to lower frequencies and developed a modulated scattering system from 0.5-20 GHz using first hybrid probes on thin quartz and then monolithic probes with silicon schottky diodes. The probe was also micromachined to 10 micron thick so as to minimize its effect
on the circuit. He obtained excellent pictures of fields on typical microwave circuits such as couplers, filters and patch antennas. Using his miniature probe, Tom could detect also the small parasitic radiation from filters and circuit elements which were not well designed. Tom finished the project by characterizing the input and output power distribution on a Raytheon 6-14 GHz traveling-wave amplifier.

Tom is a Staff RF Design Engineer at RF Micro Devices, Boston Design Center.
Boston Design Center, RF Micro Devices, 42 Lantern Way, Shirley, MA 01464, Tel: (978) 425-6376, (617) 283-2958 (mobile), (530) 652-9873 (fax) Email: tbudka@rfmd.com.

Awards:
First Prize at the IEEE Microwave Theory and Techniques Symposium
T.P. Budka and G.M. Rebeiz, "A microwave circuit electric field imager," IEEE MTT-S Int. Microwave Symp., Orlando, FL, May 1995.

Significant Publications:
T.P. Budka, M.W. Trippe, S. Weinreb and G. M. Rebeiz, "A 75 to 115 GHz quasi-optical amplifier," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 899-901, May 1994.
T.P. Budka, S.D. Waclawik and G.M. Rebeiz, "A coaxial 0.5-18 GHz near electric field measurement system for planar microwave circuits using integrated probes," IEEE Trans. Microwave Theory Tech., vol. MTT-44, pp. 2174-2184, Dec. 1996.
T.P. Budka, E.M. Tentzeris, S.D. Waclawik, N.I. Dib, L.P. Katehi and G.M. Rebeiz, "Near field mapping above a coupled-line filter and a MMIC, " Microwave Journal, pp. 94-106, March 1998.

Chen-Yu Chi (Ph.D./EE, August 1995):
"Planar Microwave and Millimeter-wave Components using Micromachining Technologies"

Chen-Yu is the first student in the TICS group who applied micromachining/MEMS for microwave circuits. Previously, all micromachining work was done for THz applications. Chen-Yu used the membrane technique for the development of high-Q planar inductors and capacitors up to 40 GHz, very low loss interdigital filters at 15 and 20 GHz, Lange couplers from 5-20 GHz and SSB mixers at 18 GHz with 30 dB image rejection response. His work set the trend for many years to come. Chen-Yu also worked on subharmonic mixers using planar-doped barrier diodes, and using biased back-to-back Schottky diodes.

Chen-Yu is Senior Engineer at Agilent, Santa Rosa, California.
Hewlett-Packard Company, 1400 Fountain Grove Parkway, MS 3USC, Santa Rosa, CA 95403, Tel: (707) 577-2506, Fax: (707) 577-2887, Email: chen-yu_chi@agilent.com.

Significant Publications:
T. H. Lee, C.Y. Chi, J. East, P. Siegel and G.M. Rebeiz, "Millimeter-wave subharmonic mixers using the planar-doped barrier diode," IEEE Trans. Microwave Theory Tech., vol. MTT-42, pp. 742-749, Apr. 1994.
H. Lee, C.Y. Chi, J.R. East, G. M. Rebeiz and G.I. Haddad, "A novel biased anti-parallel diode structure for subharmonic mixing," IEEE Trans. Microwave Guided Wave Lett., vol. MGWL-4, pp. 341-343, Oct. 1994.
C.Y. Chi and G.M. Rebeiz, "Planar microwave and millimeter-wave lumped elements and coupled-line filters using micro-machining techniques," IEEE Trans. Microwave Theory Tech., vol. MTT-43, pp. 730-738, Apr. 1995.
C.Y. Chi and G.M. Rebeiz, "Conductor-loss limited stripline resonators and filters," IEEE Trans. Microwave Theory Tech., vol. MTT-44, pp. 626-630, April 1996.
C.Y. Chi and G.M. Rebeiz, "Design of Lange-couplers and single-sideband mixers using micromachining techniques," IEEE Trans. Microwave Theory Tech., vol. MTT-45, pp. 291-294, Feb. 1997.

Daniel Filipovic (Ph.D./EE, September 1995):
"Analysis and Design of Dielectric Lens Antennas and Planar Multiplier Circuits for Millimeter-Wave Applications"

Dan's thesis are two completely independent topics. The first one is on planar antennas and the other is on planar balanced doublers. Dan started by building a double-dipole/parabolic reflector combination at 2.5 THz. He then analyzed the extended hemispherical lens antenna and the imaging properties of this system using a double-slot antenna feed (and a double-dipole feed). The theory agreed perfectly with the experiments at 250 GHz. Dan also built a wideband balanced doubler at 3-5 GHz (input frequency), and then fabricated it on GaAs using MMIC techniques and planar Schottky-diodes for 40-80 GHz applications.

Dan is Senior Engineer at QualComm Inc., San Diego, California.
Qualcomm, Building R, 10185 McKellar Court, San Diego, CA 92121-2779, Tel: (619) 658-4779/587-1121, Fax: (619) 658-1022, Email: danielf@qualcomm.com.

Significant Publications:
D.F. Filipovic, S.S. Gearhart and G.M. Rebeiz, "Double-slot antennas on extended hemispherical and elliptical dielectric lens," IEEE Trans. Microwave Theory Tech. Special Issue on Quasi-Optical Techniques, vol. MTT-41, pp. 1738-1749, Oct. 1993.
D.F. Filipovic and G.M. Rebeiz, "Double-slot antennas on extended hemispherical and elliptical quartz dielectric lenses," Int. J. Infrared Millimeter Waves, vol. 14, pp. 1905-1924, Oct. 1993.
D.F. Filipovic, R.F. Bradley and G.M. Rebeiz, "A planar broadband balanced doubler using a novel balun design," IEEE Trans. Microwave Guided Wave Lett., vol. MGWL-4, pp. 229-231, July 1994.
D.F. Filipovic, G.P. Gauthier, S. Raman and G.M. Rebeiz, "Off-axis properties of silicon and quartz dielectric lens antennas," IEEE Trans. Antennas Propagat., vol. AP-45, pp. 760-766, June 1997.

Sanjay Raman (Ph.D./EE, December 1997):
"An Integrated Monopulse Receiver with Polarimetric Capabilities"

Sanjay developed single and dual-polarized monopulse receiver at 94 GHz. The receiver used IF monopulse processing at 2-4 GHz to result in a wide instantaneous bandwidth. The monopulse receiver was integrated on a silicon lens, and was based on slot-ring antennas (single and dual polarized) and planar subharmonic mixers with a conversion loss of around 7-8 dB at 90-100 GHz. The polarization isolation in the slot-ring antennas was better than 20 dB over a 20% bandwidth. The monopulse receiver resulted in better than 30 dB nulls over a 2 GHz bandwidth, with a noise figure of 13 dB.

Sanjay is an Assistant Professor at Virginia Polytechnic University, Blacksburg, Virginia.
The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, 613 Whittemore Hall, Blacksburg, VA 24061-0111, Tel: (540) 231-2294, Fax: (540) 231-3362, Email: sraman@vt.edu.

Awards:
First Prize at the IEEE Antennas and Propagation Symposium
S. Raman and G.M. Rebeiz, "94 GHz slot-ring antennas for monopulse applications," IEEE AP-S Symp., Newport Beach, CA, June 1995.
First Prize at IEEE Microwave Theory and Techniques Symposium
S. Raman and G.M. Rebeiz, "A 94 GHz uniplanar subharmonic mixer," IEEE MTT-S Int. Microwave Symp., June 1996.

Significant Publications:
S. Raman and G.M. Rebeiz, "Single- and dual-polarized millimeter-wave slot-ring antennas," IEEE Trans. Antennas Propagat., vol. AP-44, pp. 1438-1444, Nov.1996.
S. Raman and G.M. Rebeiz, "A high-performance uniplanar W-band subharmonic mixer," IEEE Trans. Microwave Theory Tech., vol. MTT-45, pp. 955-962, June 1997.
S. Raman, S. Barker and G.M. Rebeiz, "A W-band dielectric-lens-based integrated monopulse radar receiver," IEEE Trans. Microwave Theory Tech., Vol. 46, pp. 2283-2288, Dec. 1998.

Gildas Gauthier (Ph.D./EE, January 1999):
"Low Noise Receivers, Micromachined Antennas and Low-Noise Receivers for Millimeter-Wave Applications"

Gildas' thesis contained two parts: the first part was on planar receivers for automotive applications at 77 GHz, 90 GHz and 140 GHz, using the double-slot antenna and subharmonic mixers (or standard mixers). The second part was on high-efficiency microstrip antennas built using micromachining techniques for 13 GHz, 77 GHz and 94 GHz applications. Gildas also developed several low loss transitions between cpw lines and microstrip lines and slotlines.

Gildas is Member of the Technical Staff, Thompson-CSF, Paris, France.
Thomson-CSF Microelectronique, 29 rue Carnot, 91349 Massy, France, Email: GILDAS.GAUTHIER@TCM. thomson-csf.com.

Awards:
First Prize at the IEEE Microwave Theory and Techniques Symposium
G.P. Gauthier, L.P. Katehi and G.M. Rebeiz, "A 94 GHz aperture-coupled micromachined microstrip antenna," IEEE-MTT Int. Microwave Symp., Baltimore, MD, June 1998.

Significant Publications:
G. Gauthier, W.Y. Ali-Ahmad, T.P. Budka, D.F. Filipovic and G.M. Rebeiz, "A uniplanar 90 GHz low-cost millimeter-wave receiver," IEEE Trans. Microwave Theory Tech., vol. MTT-43, pp. 1669-1672, July 1995.
G.P. Gauthier, A. Courtay and G.M. Rebeiz, "Microstrip antennas on synthesized low dielectric constant substrates," IEEE Trans. Antennas Propag., vol. AP-45, pp. 1310-1314, Aug. 1997.
G.P. Gauthier, J.-P. Raskin, L.P. Katehi and G.M. Rebeiz, "A 94 GHz aperture-coupled micromachined microstrip antenna," IEEE Trans. Antennas Propag., Vol. 47, Dec. 1999.
G. Gauthier, J.P. Raskin, L.P. Katehi and G.M. Rebeiz, "W-band single layer vertical transitions," IEEE Trans. Microwave Theory Tech., Vol. 48, pp. 161-164, Jan. 2000.
G.P. Gauthier, J.-P. Raskin and G.M. Rebeiz, "A 140-170 GHz low-noise uniplanar suhbharmonic Schottky-receiver," Accepted for publication in the IEEE Trans. Microwave Theory Tech. To appear August 2000.

Andrew Brown (Ph.D./EE, April 1999):.
"High-Q Integrated Micromachined Components for a 28 GHz Front-End Transceiver"

Andy continued the work of Chen-Yu Chi on filters and took it to its extreme. He developed very high-Q micromachined resonators at 20-60 GHz and used them in the development of very low loss micromachined filters at 28 GHz, 35 GHz and 60 GHz. He also developed a compact high performance diplexer for LMDS applications and a low phase noise micromachined-based oscillator at 28 GHz. Andy also designed a low-loss varactor-tuned RF filter at 0.8-1.4 GHz, and analyzed the wideband micromachined coupler using even/odd mode analysis techniques.

Andy is head of M-Squared Technologies, Plymouth, MI..
M-Squared Technologies, LLC, 305 N. Holbrook, Plymouth, MI 48170, Tel: (734) 674-7869, Email: mscout@engin.umich.edu.

Significant Publications:
A.R. Brown and G.M. Rebeiz, "Micromachined micropackaged filter banks," IEEE Microwave Guided Wave Lett., Vol. MGWL-8, pp. 158-160, April 1998.
S.V. Robertson, A.R. Brown, L.P. Katehi and G.M. Rebeiz, "A 10-60 GHz micromachined directional coupler," IEEE Trans. Microwave Theory Tech., Vol. 46, p. 1845-1849, Nov. 1998.
A.R. Brown, P. Blondy and G.M. Rebeiz, "Microwave and millimeter-wave high-Q micromachined resonators," Int. J. of RF and Microwave Computer-Aided Engineering, Vol. 9, pp. 326-337, July 1999.
A.R. Brown and G.M. Rebeiz, "A high-performance integrated K-band diplexer," IEEE Trans. Microwave Theory Tech., Vol. 47, pp. 1477-1481, August 1999.
A.R. Brown and G.M. Rebeiz," A ka-band micromachined low phase-noise oscillator," IEEE Trans. Microwave Theory Tech.,Vol, 47, pp. 1504-1508, August 1999.
A.R. Brown and G.M. Rebeiz, "A varactor tuned RF filter," Accepted for publication in the IEEE Trans. Microwave Theory Tech. To appear June 2000.

Scott Barker (Ph.D./EE, July 1999):
"Distributed MEMS Transmission Lines"

Scott developed the first MEMS distributed transmission line, and used it for low loss wideband phase shifters and switches from 1-120 GHz. Scott worked on the technology, which is based on MEMS bridges acting as varactors, on the mechanical modeling of the bridges, and on the electromagnetic modeling of the distributed MEMS t-line. Typical performance values were 4 dB and 5 dB loss for 360 deg phase shift at 60 GHz and 94 GHz, respectively. Scott also built a mechanical 35 GHz BPSK modulator (up to 10kbps) which consumed less than 10uW of power.

Scott is Member of the Technical Staff at the Naval Research Laboratories, Washington, DC.
Naval Research Laboratory, Code 6851, 4555 Overlook Ave., S.W., Washington, DC 20375-5347, Tel: (202) 404-4620, Fax: (202) 767-0455, Email: barker@chrisco.nrl.navy.mil.

Awards:
IEEE 2000 Microwave Prize
N.S. Barker and G.M. Rebeiz, "Distributed MEMS true-time delay phase shifters and wideband switches," IEEE Trans. Microwave Theory Tech., Vol. 46, pp. 1881-1890, Nov. 1998.
First Prize at IEEE Microwave Theory and Techniques Symposium
N.S. Barker and G.M. Rebeiz, "Optimized distributed MEMS phase shifters," IEEE-MTT Int. Microwave Symp., Anaheim, CA, June 1999.
Second Place at the IEEE Microwave Theory and Techniques Symposium
N.S. Barker and G.M. Rebeiz, "An octave bandwidth monopulse processor," IEEE MTT-S Int. Microwave Symp., Denver, CO, June 1997.

Significant Publications:
N.S. Barker and G.M. Rebeiz, "Distributed MEMS true-time delay phase shifters and wideband switches," IEEE Trans. Microwave Theory Tech., Vol. 46, pp. 1881-1890, Nov. 1998.
N.S. Barker and G.M. Rebeiz, "Distributed Ka-band MEMS transmission line BPSK modulator," Accepted for publication in the IEEE Microwave and Guided Wave Letters, To appear May 2000.
N.S. Barker and G.M. Rebeiz, "Distributed MEMS Transmission Line Phase Shifters" Submitted to IEEE Trans. Microwave Theory Tech., Nov. 1999.

Leo DiDomenico (Ph.D./EE, August 1999):
"Mobile Digital Communications Using Phase Conjugating Arrays"

Leo did an entirely different project than the rest of the group. He built a retro-directive array (phase conjugating array) using the double-mixing principle to get the phase conjugation. He also used a lot of digital signal processing and communication system theory to result in a digital communication link which is superimposed over the retrodirective array. The array, which operated at 6 GHz, could track sources up to +/- 80 degrees while at the same time transmit and receive a 128 Kbps digital link. To our knowledge, this is the first array that did this. Leo also did extensive theoretical analysis of the locking mechanisms of retro-directive arrays in motion with respect to each other.

Leo is Member of the Technical Staff of the Jet Propulsion Laboratory, Pasadena , CA.
NASA Jet Propulsion Laboratory, California Institute of Technology, Mail Stop: 300-243, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, Tel: (818) 354-0866 (W), Email: Leoddd@radar-sci.jpl.nasa.gov.

Significant Publications:
L.D. DiDomenico and G.M. Rebeiz, "Frequency stability in adaptive retrodirective arrays," Accepted for publication in the IEEE Trans. Aerospace and Electronic System. To appear June 2000.
L.D. DiDomenico and G.M. Rebeiz, "Digital communications using self-phased arrays," Accepted for publication in the IEEE Trans. Microwave Theory Tech., To appear October 2000.

Thomas Ellis (Ph.D./EE, December 1999):
"A Dual Polarized Planar Antenna for Radar and Communication Systems"

Tom developed a novel dual polarized antenna which has an endfire pattern and two polarizations. The antenna is based on a slot antenna integrated inside a dipole antenna, and backed by an electric and magnetic ground plane. The antenna resulted in 20 dB polarization isolation over a few percent bandwidth. The antenna was tested at 4.3 GHz, as a single element and in an array environment. Tom also worked on photonic bandgap tapered-slot antennas at 10 GHz and 30 GHz. He improved the radiation pattern of tapered slot antennas on thick high dielectric constant substrates using a set of periodically etched holes in the substrate.

Tom is a Senior Project Engineer at REMEC Q-bit in Florida.
Tom works on the design of power amplifiers and amplifier systems for cellular communication systems. He can be reached at: REMEC Q-bit, 2144 Franklin Drive NE, Palm Bay, Florida 32905-4021, (407) 727-1838 x306, Fax: (407) 727-3729, TEllis@RemecQ-Bit.Com.

Awards:
Third Place at IEEE Microwave Theory and Techniques Symposium
T.J. Ellis and G.M. Rebeiz, "MM-wave tapered slot antennas on micromachined photonic bandgap dielectrics," IEEE MTT-S Int. Microwave Symp., June 1996.

Significant Publications:
J.B. Muldavin, T.J. Ellis and G.M. Rebeiz, "Tapered-slot antennas on thick dielectric substrates using micromachining techniques," IEEE AP-S, Montreal, Canada, pp. 1110-1113, June 1997.
T. Ellis, R.L. Robertson, L.P. Katehi and G.M. Rebeiz,"A dual polarized antenna for radar and communication systems," European Microwave Conference, pp. 12-18 (vol. 2), Amsterdam, Oct. 1998.