Sedki M. Riad Professor,  Time Domain & RF Measurement Laboratory Education Teaching Interests Research Interests Selected Publications Research Sponsors Files and Links

Contact Information:

The Bradley Department of Electrical and Computer Engineering 340 Whittemore Hall Virginia Tech Blacksburg, VA 24061-0111

Tel:  (540) 231-4463 Fax: (540) 231-3362 eFax: (801) 327-6380 E-Mail: sriad@vt.edu

 

Education:

 

B.S.E.E., Cairo University, Egypt, 1966

M.S.E.E., Cairo University, Egypt, 1972

Ph.D., University of Toledo, 1976

    Dissertation Research performed as Guest Worker at  NIST, National Institute for standards and Technology, 1975-1976

 

Teaching Interests:

Electromagnetics.
Microwave and RF Engineering, and Radio Engineering.
Time Domain and RF Analysis, Measurements, and Synthesis.
Network Analysis, and Electronics

 

Research Interests:

Wideband Microwave Measurements with emphasis on Time Domain Techniques.
Wideband Characterization and Modeling of Devices, Networks, Materials, or Structures.
Signal Processing, Deconvolution, and Data Reduction Methods.
Design and Construction of TDR and Pulse Measurement Instrumentation and Setups.
Sensors and NDE methods

Selected Publications:  Adobe pdf files for some papers are posted on the TDL website

Modeling of Electronic Packaging and Interconnects

• "RF/Microwave Surface Mount Plastic Package Modeling and Characterization: 16 Lead SOIC Package Outline," S.M. Riad, W. Su, I. Salama, A. Elshabini-Riad, M. Rachlin, W. Baker, and James Perdue, Proceedings of the Fourth Wireless Symposium, Santa Clara, California, February 12-16, 1996.
• "Crosstalk Analysis of Multisection Multiconductor Lines," W. Su, S. M. Riad, A. Elshabini-Riad, and T. Poulin, IEEE Trans. Instrum.  Meas., Vol. 42, No. 6, pp. 926-931, December 1992.
• "Time Domain Techniques Applied to Measurements and Modeling of Microwave Packages," S. M. Riad, A. Elshabini-Riad, I. Bhutta, W. Su, and M. B. Hayes, Full Paper Presented in The 1993 Microwave Hybrid Circuits, November 1993, Chandler, AZ, Rogers Corporation.  Paper also appeared in the Microwave Hybrid Conference Proceedings, 1993.  (INVITED)
• "Wideband Characterization and Modeling of TAB Packages Using Time Domain Techniques," Wansheng Su, Sedki M. Riad, Thomas Poulin, Darrell Fett, and Zhi-Yuan Shen, International Journal for Hybrid Microelectronics, ISHM, Vol. 14, No. 2, pp. 55-61, June 1991
• "Wideband Device Modeling Using Time Domain Reflectometry," S. T. Salvage and S. M. Riad, CPEM 82 Digest, Boulder, Colorado, pp. G7-G8, June 1982.

Material Characterization

• "Wideband Electrical Characterization of Materials Used in MCM Applications", S. Riad, W. Su, A. Elshabini-Riad, F. Barlow, and I. Salama, The International Journal of Microcircuits and Electronic Packaging, Vol. 19, No. 3, Third Quarter, pp. 281-287, 1996.
• "Dielectric Loss Determination Using Perturbation," M. Y. Andrawis, W. Davis, S.M. Riad, and A. Elshabini-Riad, IEEE Trans. Instrum.  Meas., Vol. 42, No. 6, pp. 1032-1035, December 1992.
• "An Enhanced Time Domain Approach For Dielectric Characterization Using Stripline Geometry," K.M. Fidanboylu, S.M. Riad, and A. Elshabini-Riad, IEEE Transactions on Instrumentation and Measurements, Vol. 41, No. 1, pp. 132-136, February 1992.
• "Microwave Material Characterization Using Stripline Resonators," Wansheng Su, Sedki M. Riad, and Aicha Elshabini-Riad, International Journal for Hybrid Microelectronics, ISHM, Vol. 14, No. 2, pp. 48-54, June 1991.

Signal Processing and Deconvolution

• "A Comparative Study of the Optimization Criteria Developed for TDR Deconvolution Problems," A. Bennia and S. M. Riad, presented at the XXV th General Assembly of the International Union of Radio Science, Lille, France, August 28 - September 5, 1996.  (INVITED)
• "Filtering Capabilities and Convergence of the Van-Cittert Deconvolution Technique," A. Bennia and S. M. Riad,  IEEE Trans. Instrum.  Meas., Vol. 41, No. 2, pp. 246-250, April 1992.
• "Application of Homomorphic Deconvolution for the Separation of TDR Signals Occurring in Overlapping Time Window," S. M. Riad and N. S. Nahman, IEEE Trans. Instrum. & Meas., Vol. IM-25, No. 4, pp. 388-391, Dec. 1976.

Calibration of TD Measurement systems

• "Calibration of Time Domain Network Analyzers," W. Su and S. M. Riad, IEEE Trans. Instrum. Meas., vol. IM-42, pp. 157-161, April 1993.
• "Time Domain Calibration of TDR Measurement Systems," W. Su and S. M. Riad, Presented in the CPEM'92, Conference on Precision Electromagnetic Measurements, Paris, France, June 9-12.  Also, appeared in the CPEM, Proceedings, 1992.
• "Electrical Sampling Techniques," S. M. Riad, presented at SPIE's Conference on Advances in Semiconductors and Semiconductor Structures, Characterization of Very High Speed Semiconductor Devices and Integrated Circuits: Critical Review of Technology, Bay Point, Florida, March 1987. [INVITED]
• "Modeling of HP-1430A Feed-Through Wideband (28ps) Sampling Head," S. M. Riad, IEEE Trans. Instrum. & Meas., Vol. IM-31, No. 2, pp. 110-115, June 1982.

Design and prototyping of TDR Instruments

• "Design and Construction of a Thick Film Hybrid Time Domain Reflectometer," J. He, J. E. Keys, A. Elshabini-Riad, and S. M. Riad, Presented at the International Symposium on Electromagnetic Metrology, ISEM'89, August 19-22, 1989, Beijing, China, also appeared in the conference proceedings pp. 92-97, 1989.
• "The Design and Fabrication of Hybrid Thick Film Subnanosecond Pulse Generators," S. M. Riad, M. Ahmad, A. A. Riad, and F. W. Stephenson, International Journal for Hybrid Microelectronics, Vol. 5, No. 2, pp. 552-558, November 1982.
• "Design, Fabrication, and Characterization of a Wideband Hybrid Balun," S. Lu, A.  Elshabini-Riad, and S. M. Riad, IEEE Trans. on Instrumentation and Measurement, Vol. 40, No. 2, pp. 486-489, April 1991.

Applications of Time Domain Measurements

• "Velocity of an RF Pulse Propagation in a Waveguide," W. Su, I.M. Besieris, and S.M. Riad, IEEE Microwave and Guided Wave Letters, Vol. 2, No. 6, pp. 255-256, June 1992.
• "Bond Verification of Space Shuttle Tiles Using Time Domain Techniques," A. Bennia, W. Su, and S. M. Riad, IEEE Trans. on Instrumentation and Measurement, Vol. 40, No. 2, pp. 493-495, April 1991.
• "Application of an Automated Pulse Measurement System to Telecommunication Measurements," W. L. Gans, J. R. Andrews, S. M. Riad, A. Cozannet and J. Debeau, CNET-URSI Digest, Lannion, France, pp. 165-170, October 1977.

NDE: Concrete & Civil Structures

• "Measuring Dielectric Properties of Concrete:  New Methods," Al-Qadi, I. L., R. Mostafa, W. Su, and S. M. Riad, Structural Materials Technology:  An NDE Conference, Hartsbower, P. E. and P. J. Pstolarski, Eds., San Diego, CA, Feb. 1996, pp. 16-27.
• "TEM Horn Antenna Design and Concrete Material Characterization," R. Mostafa, W. Su, S. M. Riad, and I. L. Al-Qadi, presented at the XXV th General Assembly of the International Union of Radio Science, Lille, France, August 28 - September 5, 1996.  (INVITED)
• "Low RF Characterization of Concrete Materials Using a Parallel-Plate Fixture," O. A. Hazim, W. Su, S. M. Riad, and I. L. Al-Qadi, National Radio Science Meeting, University of Colorado, Boulder, Co, Jan. 5-8, 1994.
• "Large Coaxial Line Fixture for Wideband Characterization of Concrete Material," W. Su, O. Hazim, S. M. Riad, and I. L. Al-Qadi, National Radio Science Meeting, University of Colorado, Boulder, Co, Jan 5-8, 1994.

Sensors

• "Analysis and Design of Ferrite Cores for Eddy Current-Killed Oscillator Inductive Proximity Sensors," Kofi D. Anim-Appiah and Sedki M. Riad, IEEE Trans. on Magnetics, Vol. 33, No. 3, pp. 2274-2281, May 1997.
• "Applications of Multilayer Circuit Technologies to Sensors,"  M. B. Hayes, I. Bhutta, A. Elshabini-Riad, and S. M. Riad, Full Paper Presented at The International Symposium of Hybrid Microelectronics (ISHM), Dallas, Texas, November 9-11, 1993.  Paper also appeared in ISHM Proceedings, pp. 13-19, 1993.

Short Courses on Time Domain and RF Measurements and Material Characterization:

• "Time Domain Measurements Techniques," Sedki M. Riad, presented as part of the short course Microwave and RF Measurements for Wireless Applications, 50th ARFTG Conference, Automatic RF Technique Group, Portland, Oregon, December 3-4,1997.  (INVITED)
• "Time Domain Measurements Techniques and RF and Microwave Applications," Sedki M. Riad, half day Tutorial, presented at the SECON'97, IEEE Southeastcon 1997, Blacksburg, VA, April 12-14, 1997.  (INVITED)
• "Wideband Measurements and Material Characterization," Sedki M. Riad, Five half-days Short Course, Technical University of Ilmenau, Germany, May 27-31, 1996.

Sponsors:

Further Information:

• Dr. Riad is the Founder and Past Director of the Time Domain and RF Measurement Laboratory.
• Dr. Riad is a Fellow of the Institute of Electrical and Electronic Engineers, IEEE, January 1992, Citation: "For contributions  to time-domain measurements through physical modeling of sampling devices, simulation, and deconvolution."
• Dr. Riad is a Registered Professional Engineer - P.E. 26498, State of Florida.  (since 1978).
• Patents:
• "Non-symmetrical inductive sensors having ferrite coil geometries with different top and base geometries,"  Kofi Anim-Appiah, Sedki M. Riad, and Shinzo Onishi,  August 9, 1994 / September 21, 1992, US 5,336,997
• "Circuit structure including RF/wideband resonant vias,"  Sedki M. Riad,  March 23, 1999 / March 28, 1997, US 5,886,597
• Dr. Riad's Course Web Page (Filebox).