Marhefka_RRonald J. Marhefka osu-logo_red_white

Senior Research Scientist / Adjunct Professor              ESL_Logo

 

 

WEB LINKS:

 

Antennas 3rd Edition & Book Software

 

NEC - Basic Scattering Code

 

EDUCATION:

 

Ph.D. E.E.       The Ohio State University      1976

M.Sc. E.E.       The Ohio State University      1971

B.S.E.E.          Ohio University, Athens         1969

 

EMPLOYMENT HISTORY:

 

The Ohio State University      Senior Research Scientist        1993 - present

The Ohio State University      Research Scientist                   1983 - 1993

The Ohio State University      Senior Research Associate      1977 - 1983

The Ohio State University      Research Associate II             1976 - 1977

 

HONORS AND AWARDS:

 

IEEE Millennium Medal, 2000

The Ohio State University, College of Engineering, Research Accomplishment Award 1999

One of 50 research projects given congressional recognition, 1998

IEEE Antennas and Propagation Society, President, 1998

IEEE Antennas and Propagation Society, Vice President, 1997

IEEE Antennas and Propagation Society, Publications Chair, 1997 - present

IEEE Antennas and Propagation Society, Administrative Committee Member, 1996 – 2002

IEEE Antennas and Propagation Society, Technical Program Co-Chair, Columbus Symposium, 2002

Encyclopedia of Electrical and Electronic Engineering, Wiley and Sons, member editorial board, 1995 - 1996

The Ohio State University, ElectroScience Laboratory’s Outstanding Paper Award, 1995

Applied Computational Electromagnetics Society, Technical Achievement Award, 1993

IEEE, Fellow, 1992

IEEE Transactions on Antennas and Propagation, Editor, 1992 – 1995

The Ohio State University, College of Engineering, Lumley Research Award, 1992

Union of Radio Science International, Member Commission B, 1990

IEEE Transactions on Antennas and Propagation, Associate Editor, 1988 – 1992

Union of Radio Science International, 3rd place conference paper competition, 1988

Applied Computational Electromagnetics Journal, Associate Editor, 1986 – present

The Ohio State University, ElectroScience Laboratory’s Outstanding Report Award, 1983

IEEE Antennas and Propagation Society’s, Best Applications Paper Award, 1976

IEEE Antennas and Propagation Society’s, R. W. P. King Paper Award, 1976

Honor Societies:  Eta Kappa Nu, Tau Beta Pi, Phi Kappa Pi, Sigma Xi

 

KEY SKILL AREAS:

 

High frequency methods

Numerical Techniques

Antennas and arrays

Radomes and FSS

Scattering and RCS

Electromagnetic theory

 

RESEARCH RESUME:

 

Dr. Marhefka is involved in practical scattering and antenna problems. Among the antenna problems he has worked on in the past includes the development of a broadband array for pulse transmission to be used in underground transmission. He also worked on developing two-dimensional models for conformal arrays mounted on the leading edge of the wings of high-speed aircraft.

 

In addition, he developed techniques to analyze basic scattering structures using modern diffraction theory. This work includes development of approximate theoretical solutions for the volumetric radiation patterns of arbitrary antennas mounted on the fuselage of general type aircraft. He also developed an approximate theoretical solution for the pattern optimization of wing-mounted arrays. Furthermore, he worked on techniques to combine the Geometrical Theory of Diffraction with the moment methods.

 

He has applied these high frequency techniques to analyze the radiation patterns of and the coupling between antennas in a shipboard environment. Portions of this work have become part of a general-purpose computer code called the Numerical Electromagnetics Code – Basic Scattering Code. This code has been widely distributed to government and industrial organizations throughout the United States and the world in an attempt to make the state of the art techniques available to working engineers and scientists.

 

He has extended these techniques and developed new solutions for finding the radar cross section of complex scattering bodies. He developed higher order diffraction coefficients to improve the accuracy of prediction. He also used these techniques to do phenomenology studies of how radar objects scatter for target identification purposes. He is the author of a computer code called the Radar Cross Section – Basic Scattering Code, which is distributed to authorized government and United States industries.

 

He has been a member of a government working-group determining and implementing the requirements for a general geometry package to be used for electromagnetic research in the whole scattering community. He has also been on a Blue Ribbon Panel for the Army studying the antennas for the Comanche and Blackhawk helicopters.

 

More recently, he has been working with developing new superstructures for ships, specifically; new masts based on modern radome design concepts. This has entailed everything from design of the radome, predictions of their antenna and scattering performance, development of models for test, and consultation on fabrication of the actual structures with the Navy. It has lead to a mast being put on an active ship with the design of a new ship underway. The practical applications of this new work include the analysis of indoor and outdoor wireless propagation models as well as anechoic camber modeling. Also, he is involved with extending FSS designs to infrared. In addition, he is working on new wideband array concepts.

 

COMPUTER CODES:

 

R. J. Marhefka, “Numerical Electromagnetic Code – Basic Scattering Code, (NEC-BSC Version 4.2), User’s Manual," Technical Report (preliminary), The Ohio State University, ElectroScience Laboratory, June 2000.

 

G. F. Paynter and R. J. Marhefka, “The NEC-BSC Workbench, A Companion Graphical Interface Tool,” 1998 Applied Computational Electromagnetics Conference, Monterey, California, March 16-20, 1998.

 

R. J. Marhefka and J. W. Silvestro, “Near Zone – Basic Scattering Code, User’s Manual with Space Station Applications,” Technical Report 716199-13, The Ohio State University ElectroScience Laboratory, March 1989.

 

R. J. Marhefka, “Radar Cross Section - Basic Scattering Code, RCS-BSC (Version 2.0) User's Manual,” Technical Report 718295-15, The Ohio State University ElectroScience Laboratory, February 1990.

 

BOOKS and BOOK CHAPTERS:

 

J. D. Kraus and R. J. Marhefka, Antennas for All Applications, 3rd Edition, McGraw-Hill, 2001.

 

W. D. Burnside and R. J. Marhefka, “Antennas On Aircraft, Ships, or Any Large, Complex Environment,” Chapter 20 in Antenna Handbook: Theory, Applications, and Design, edited by Y. T. Lo and S. W. Lee, Van Nostrand Reinhold Co. Inc., New York, 1988.

 

REFEREED PUBLICATIONS:

 

C.-P. Lim, M. Lee, R. J. Burkholder, J. L. Volakis, and R. J. Marhefka, “60 GHz Indoor Propagation Studies for Wireless Communications Based on a Ray-Tracing Method,” EURASIP Journal on Wireless Communications and Networking, Vol. 2007, Article ID 73928, 6 pages, 2007, doi:10.1155/2007/73928.

 

R. J. Burkholder, P. H. Pathak, K. Sertel, R. J. Marhefka, J. L. Volakis, and R. W. Kindt, “A Hybrid Framework for Antenna / Platform Analysis,” Journal of Applied Computational Electromagnetics, Vol. 21, No. 3, pp. 177-195, November 2006.

 

J. T. Rockway, E. H. Newman and R. J. Marhefka, “The Spherical Harmonic Interface Procedure for MM and UTD Codes,” Journal of Applied Computational Electromagnetics, Vol. 21, No. 2, pp. 105-110, July 2006.

 

C. Tokgoz and R. J. Marhefka, “A UTD-Based Asymptotic Solution for the Surface Magnetic Field on a Source Excited Circular Cylinder with an Impedance Boundary Condition,” IEEE Trans. Antennas and Propagat., Vol. 54, No. 6, pp. 1750-1757, June 2006.

 

C. Tokgoz, P. H. Pathak, and R. J. Marhefka, “An Asymptotic Solution for the Surface Magnetic Field Within the Paraxial Region of a Circular Cylinder With an Impedance Boundary Condition,” IEEE Trans. Antennas and Propagat., Vol. 53, No. 4, pp. 1435-1443, April 2005.

 

J. E. Raynolds, B. A. Munk, J. B. Pryor and R. J. Marhefka, “Ohmic Loss in Frequency Selective Surfaces,” Journal of Applied Physics, Vol. 98, pp. 5346-5358, May 2003.

 

B. A. Munk, D. S. Janning, J. B. Pryor and R. J. Marhefka, “Scattering from Surface Waves on Finite FSS,” IEEE Trans. Antennas and Propagat., Vol. 49, No. 12, pp. 1782 - 1793, December 2001.

 

J. H. Meloling and R. J. Marhefka, “A Caustic Corrected UTD Solution for the Fields Radiated by a Source on a Flat Plate with Curved Edge,” IEEE Trans. Antennas and Propagat., Vol. 45, No. 12, pp. 1839-1849, December 1997.

 

E. D. Constantinides and R. J. Marhefka, “An Extended UTD Analysis for RCS Computations Involving Higher Order Curved Surfaces,” invited paper, Annales des Telecomunicationes, Vol. 50, No. 5-6, pp. 474-486, March-April, 1995. (Won Best ESL Paper Award 1995)

 

L. P. Ivrissimtzis and R. J. Marhefka, “Edge Wave Diffraction for Flat Plate Structures,” IEE Proc. Microw. Antennas Propag., Vol. 141, No. 1, pp. 30-36, February 1994.

 

E. D. Constantinides and R. J. Marhefka, “A Complete Uniform Asymptotic Expansion of the Incomplete Airy Function,” SIAM, Orthogonal Polynomials and Special Functions Newsletter, Vol. 4, No. 1, pp. 6-7, Fall 1993.

 

E. D. Constantinides and R. J. Marhefka, “A UGO/EUTD Solution for the Scattering and Diffraction from Cubic Polynomial Strips,” IEEE Trans. Antennas and Propagat., Vol. 41, No. 8, pp. 1088-1098, August 1993.

 

E. D. Constantinides and R. J. Marhefka, “Efficient and Accurate Computation of the Incomplete Airy Functions,” Radio Science, Vol. 28, No. 4, pp. 441-457, July-August 1993.

 

L. P. Ivrissimtzis and R. J. Marhefka, “A Uniform Ray Approximation of the Scattering by Polyhedral Structures,” IEEE Trans. Antennas and Propagat., Vol. 40, No. 11, pp. 1302-1312, November 1992.

 

W. D. Burnside and R. J. Marhefka, “Antennas on Complex Platforms,” invited paper, Proc. IEEE, Vol. 80, No. 1, pp. 204-208, January 1992.

 

L. P. Ivrissimtzis and R. J. Marhefka, “A Note on Double Edge Diffraction for Parallel Wedges,” IEEE Trans. Antennas and Propagat., Vol. 39, No. 10, pp. 1532-1537, October 1991.

 

J. H. Choi and R. J. Marhefka, “Numerical Techniques to Determine the UTD Bistatic Creeping Wave Paths and Parameters for an Ellipsoid,” Applied Computational Electromagnetic Society Journal, Vol. 6, No. 1, pp. 140-158, Summer 1991.

 

L. P. Ivrissimtzis and R. J. Marhefka, “Double Diffraction at a Coplanar Skewed Edge Configuration,” Radio Science, Vol. 26, No. 4, pp. 821-830, July-August 1991.

 

E. D. Constantinides and R. J. Marhefka, “Plane Wave Scattering from 2-D Perfectly Conducting Superquadric Cylinders,” IEEE Trans. Antennas and Propagat., Vol. 39, No. 3, pp. 367-376, March 1991.

 

L. P. Ivrissimtzis and R. J. Marhefka, “Edge Wave Vertex and Edge Diffraction,” Radio Science, Vol. 24, No. 6, pp. 771- 784, November-December 1989.

 

E. H. Newman and R. J. Marhefka, “An Overview of MM and UTD Methods at The Ohio State University,” Proc. of the IEEE, Vol. 77, No. 5, pp. 700-708, May 1989; also IEEE Press book, Radar Cross Sections of Complex Objects.

 

R. J. Marhefka and T. J. Brinkley, “Comparison of Methods for Far Zone Scattering from a Flat Plate and Cube,” Applied Computational Electromagnetic Society Journal, Vol. 3, No. 2, pp. 57-78, Fall 1988.

 

W. D. Burnside, R. C. Rudduck and R. J. Marhefka, “Summary of GTD Computer Codes Developed at the Ohio State University,” IEEE Trans. Electromagnetic Compatibility, Vol. EMC-22, No. 4, pp. 238-243, November 1980.

 

P. H. Pathak, W. D. Burnside and R. J. Marhefka, “Uniform GTD Analysis of the Scattering of Electromagnetic Waves by a Smooth Convex Surface,” IEEE Trans. Antennas and Propagat., Vol. AP-28, No. 5, pp. 631-642, September 1980; also IEEE Press book, Geometrical Theory of Diffraction, 1981.

 

W. D. Burnside, C. L. Yu and R. J. Marhefka, “A Technique to Combine the Geometrical Theory of Diffraction and the Moment Method,” IEEE Trans. Antennas and Propagat., Vol. AP-23, No. 4, pp. 551-557, July 1975; also IEEE Press book, Geometrical Theory of Diffraction, 1981. (Won R. W. P. King Award -APS, 1976)

 

W. D. Burnside, M. C. Gilreath, R. J. Marhefka and C. L. Yu, “A Study of KC-135 Aircraft Antenna Patterns,” IEEE Trans. Antennas and Propagat., Vol. AP-23, No. 3, pp. 309-316, May 1975; also IEEE Press book, Geometrical Theory of Diffraction, 1981. (Won Best Applications Award - APS, 1976)

 

W. D. Burnside, R. J. Marhefka and C. L. Yu, “Roll Plane Analysis of On-Aircraft Antennas,” IEEE Trans. Antennas and Propagat., Vol. AP-21, No. 6, pp. 780-786, November 1973.

 

ORAL PRESENTATIONS:

 

P. C. Chang, R. J. Burkholder, R. J. Marhefka, J. L. Volakis, “Diffraction Coefficients for Dielectric Wedges and Corners with Application to Mon0static Building Imaging,” XXIX General Assembly of the International Union of Radio Science, Chicago, Illinois, August 7-16 2008.

 

T. E. Morton and R. J. Marhefka, “Performance Analysis of Large Cylindrical Arrays Comprised of Subarray Panels,” National Aerospace and Electronics Conference (NAECON), Dayton, Ohio, July 16-18, 2008.

 

J. T. Rockway, R. J. Marhefka, J. Meloling, and K. Rouzbehani, “Computationally Efficient Solution for Complex Naval Environments with Electrical Large Radars,” International IEEE/AP-S Symposium, and URSI Radio Science Meeting, San Diego, California, July 6-11, 2008.

 

R. J.Burkholder, P. C. Chang, R. J. Marhefka and J. L. Volakis, “UTD Ray Tracing for Building Imaging Studies,” International IEEE/AP-S Symposium, and URSI Radio Science Meeting, San Diego, California, July 6-11, 2008.

 

R. J.Burkholder, R. J. Marhefka and J. L. Volakis, “Radar Imaging Through Cinder Block Walls and Other Periodic Structures,” International IEEE/AP-S Symposium, and URSI Radio Science Meeting, San Diego, California, July 6-11, 2008.

 

R. S. Awadallah, D. E. Freund, C. R. Sprouse, R. J. Burkholder, R. J. Marhefka, C.-L. Chang, J. L. Volakis and E. J. Baranoski, “Propagation Modeling and Validation in the DARPA VisiBuilding Program,” USNC-URSI National Radio Science Meeting, Boulder, Colorado, January 3-6, 2008.

 

P. C. Chang, R. J. Burkholder, J. L. Volakis and R. J. Marhefka, “Model-Based CLEAN Algorithm for Through-Wall Radar Image Enhancement,” USNC-URSI National Radio Science Meeting, Boulder, Colorado, January 3-6, 2008.

 

R. J. Burkholder, P. Chang, Y. Bayram, R. J. Marhefka and J. L. Volakis, “Through-Wall Imaging of Building Interiors: Electromagnetic Modeling and Experimental Validation,” URSI Radio Science Meeting, Ottawa, Ontario, Canada, July 22-26, 2007.

 

R. J. Marhefka, J. D. Young and J. P. Towle, “Design, Fabrication and Measurement of an FSS Antenna Ground Plane,” International IEEE/AP-S Symposium, Honolulu, Hawaii, June 10-15, 2007.

 

R. J. Burkholder, P. Chang, Y. Bayram, R. J. Marhefka, J. L. Volakis, “Model-Based Near-Field Imaging of Objects Inside a Room,” International IEEE/AP-S Symposium, Honolulu, Hawaii, June 10-15, 2007.

 

R. J. Marhefka, “Applications of Asymptotic Methods to Large Practical EM Prediction and Design Problems,” IEEE Melbourne AP/MTT Joint Chapter & IEEE FIT Student Chapter Meeting, Melbourne, Florida, April 10, 2007.

 

R. J. Marhefka, “UTD Double Diffraction within Structure Interaction,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Albuquerque, New Mexico, July 9 - 14, 2006.

 

J. F. McCann, R. J. Marhefka and B. A. Munk, “An Array of Slot Elements for Wide Scan Angles and Large Bandwidth,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Albuquerque, New Mexico, July 9 - 14, 2006.

 

C. P. Lim, R. J. Burkholder, J. L. Volakis and R. J. Marhefka, “Propagation Modeling of Indoor Wireless Communications at 60 GHz,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Albuquerque, New Mexico, July 9 - 14, 2006.

 

R. J. Burkholder, R. W. Kindt, P. H. Pathak, K. Sertel, R. J. Marhefka and J. L. Volakis, “Generalized Hybrid Approach for Antenna/Platform Analysis,” The Annual Review of Progress in Applied Computational Electromagnetics, Miami, Florida, March 12 – 16, 2006.

 

P. Janpugdee, P. H. Pathak, R. W. Kindt, R. J. Marhefka and J. L. Volakis, “A Hybrid Numerical – UTD Analysis of Large Arrays on a Large Platform,” International Conference on Electromagnetics in Advanced Applications, Torino, Italy, September 12 – 16, 2005.

 

J. F. McCann, R. J. Marhefka and B. A. Munk, “Design of a Large Bandwidth Array of Slot Elements with Wide Scan Angle,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Washington, DC, July 3 - 8, 2005.

 

J. T. Rockway, E. H. Newman and R. J. Marhefka, “Spherical Harmonic Interface Procedure Used as a Design Tool for Antennas in Complex Environments,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Washington, DC, July 3 - 8, 2005.

 

R. J. Marhefka, “The Other NEC (BSC) an Asymptotic Complement,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Monterey, California, June 20 - 25, 2004.

 

J. T. Rockway, E. H. Newman and R. J. Marhefka, “Efficient Interface between Numerical Antenna Modeling and Environmental Simulation Codes,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Monterey, California, June 20 - 25, 2004.

 

E. C. Ngai, H. L. Southall and R. J. Marhefka, “Design of a Novel Shaped-Beam Conformal Antenna on a Complex Airborne Platform,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Monterey, California, June 20 - 25, 2004.

 

E. C. Ngai and R. J. Marhefka, “Boeing 707 Antenna Coverage for X-Band Sensor Link,” 2003 International Symposium on Electromagnetic Compatibility, Istanbul, Turkey, May 11-16, 2003.

 

J. T. Rockway and R. J. Marhefka, “Determination of Transmission Coefficients from Finite Planar Composites Using Spatial Averaging,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Columbus, Ohio, June 22 - 27, 2003.

 

J. H. Meloling and R. J. Marhefka, “FSS Equivalent Circuit Extraction Techniques,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Columbus, Ohio, June 22 - 27, 2003.

 

R. J. Marhefka, B. A. Baertlein, M. Rao and K. Prakah-Asant, “Modeling the Performance of Automotive Bumper Mounted Antennas,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, San Antonio, Texas, June 16-21, 2002.

 

C. Tokgoz, P. H. Pathak and R. J. Marhefka, “Computation of Green’s Functions for a Surface Field on a Circular Cylinder with an Impedance Boundary Condition,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, San Antonio, Texas, June 16-21, 2002.

 

B. A. Baertlein, R. J. Marhefka, W. Giesler and M. Rao, “Performance Modeling of Radar Pre-Crash Sensors,” ITS 9th World Congress, Chicago, Illinois, October 14 – 17, 2002.

 

B. A. Munk, J. B. Pryor, J. E. Raynolds and R. J. Marhefka, “On Dielectric and Ohmic Losses in FSS,” 24th Antenna Workshop on Innovative Periodic Antennas, Noodwijk, The Netherlands, May 30 – June 1, 2001.

 

J. T. Rockway, R. J. Marhefka and N. J. Champagne, “An Asymptotic Technique for the Far Field Pattern of a Dipole in an Infinite Stratified Medium,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Boston, Massachusetts, July 8-13, 2001.

 

C. Tokgoz, R. J. Marhefka and P. H. Pathak, “Evaluation of Surface Fields within the Paraxial Region of a Source Excited Circular Cylinder with an Impedance Boundary Condition,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Boston, Massachusetts, July 8-13, 2001.

 

C. Tokgoz, P. H. Pathak and R. J. Marhefka, “Large Axial Distance Evaluation of Magnetic Fields Due to a Magnetic Source Located on a Conducting Circular Cylinder,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Salt Lake City, Utah, July 16-21, 2000.

 

A. Aktas and R. J. Marhefka, “An Approximate Slope Diffraction Coefficient for Material Plate Junctions,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Orlando, Florida, July 11-16, 1999

 

S. L. Krupa and R. J. Marhefka, “Simplified Modeling of Bi-Periodic Pyramidal Dielectric Absorber Structures,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Orlando, Florida, July 11-16, 1999.

 

C. Tokgoz and R. J. Marhefka, “Surface Field Excitation by a Magnetic Point Source on an Impedance Cylinder,” International IEEE/AP-S Symposium and URSI Radio Science Meeting, Orlando, Florida, July 11-16, 1999.

 

G. F. Paynter and R. J. Marhefka, “The NEC-BSC Workbench, A Companion Graphical Interface Tool,” 1998 Applied Computational Electromagnetics Conference, Monterey, California, March 16-20, 1998.

 

A. Aktas and R. J. Marhefka, “An Approximate UTD Coefficient for Material Plate Junctions,” 1998 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Atlanta, Georgia, June 21-26, 1998.

 

R. J. Burkholder and R. J. Marhefka, “A Corner Diffraction Solution for Material Flat Plate Structures,” 1998 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Atlanta, Georgia, June 21-26, 1998.

 

R. J. Marhefka, “UTD Perspective on Where Objects Radiate,” 1997 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Montreal, Quebec, July 13-18, 1997.

 

R. J. Marhefka and L. W. Henderson, “Analysis of Dielectric Structures Using the NEC-BSC,” 12th Annual Review, Applied Computational Electromagnetic Society, Naval Postgraduate School, Monterey, California, March 18-22, 1996.

 

R. J. Marhefka, “High Frequency Analysis of Spatial Coupling in a Complex Environment,” 1996 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Baltimore, Maryland, July 21-26, 1996.

 

T. H. Lee, W. D. Burnside and R. J. Marhefka, “Simulation of Antenna Measurement Errors Caused by Clutter Sources,”  Eighteenth Annual Meeting & Symposium, Antenna Measurement Techniques Association, Seattle, Washington, September 30 – October 3, 1996.

 

R. J. Marhefka and L. W. Henderson, “A Graphical User Interface for the NEC-BSC,” 11th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 20-24, 1995.

 

R. J. Marhefka, “UTD Diffraction Coefficient for Dielectric Plate Junctions,” 1995 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Newport Beach, California, June 18-23, 1995.

 

R. J. Marhefka and W. J. Koh, “Total Surface Current on a PEC Angular Sector,” 1995 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Newport Beach, California, June 18-23, 1995.

 

R. J. Marhefka and E. D. Constatinides, “A UGO/EUTD with Application to Fourth Order Polynomial Strips,” 10th Annual Review, Applied Computational Electromagnetics Society, Monterey, California, March 21-26, 1994.

 

R. J. Marhefka and J. H. Meloling, “A Caustic Corrected UTD Solution for a Short Monopole near a Curved Edge on a Flat Surface,” 1994 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Seattle, Washington, June 19-24, 1994.

 

R. J. Marhefka and J. H. Meloling, “The Relationship between Different Equivalent Current Formulations,” 1994 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Seattle, Washington, June 19-24, 1994.

 

R. J. Marhefka and E. D. Constantinides, “A Uniform Asymptotic Analysis for the Scattering and Diffraction by Smoothly Indented Boundaries Containing Edges,” 1993 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Ann Arbor, Michigan, June 28-July 2, 1993.

 

R. J. Marhefka and E. D. Constantinides, “An Extended UTD Analysis for RCS Computations Involving Higher Order Curved Surfaces,” 1993 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Ann Arbor, Michigan, June 28-July 2, 1993.

 

R. J. Marhefka, “Far Zone Scattering by a Flat Plate with Higher Order Effects,” 8th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 16-20, 1992.

 

R. J. Marhefka and J. H. Meloling, “Scattering Interactions Between a Cylinder and a Strip,” 1992 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Chicago, Illinois, July 18-25, 1992.

 

R. J. Marhefka and E. D. Constantinides, “On a Class of Complete and Incomplete Generalized Airy Functions and Their Applications to High-Frequency Scattering and Diffraction Problems,” 1992 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Chicago, Illinois, July 18-25, 1992.

 

R. J. Marhefka and P. H. Pathak, “On the Behavior of Uniform Ray Solutions at Lower Frequencies,” invited paper, 1992 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Chicago, Illinois, July 18-25, 1992.

 

R. J. Marhefka, “Implementation of the NEC - Basic Scattering Code on a PC,” 7th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 18-22, 1991.

 

R. J. Marhefka and L. P. Ivrissimtzis, “Double Diffraction by Two Skewed Edges,” 1991 International IEEE/AP-S Symposium and URSI Radio Science Meeting, London, Ontario, June 24-28, 1991.

 

R. J. Marhefka and E. D. Constantinides, “A Modified UTD Solution for Curved Surface Scattering,” 1991 International IEEE/AP-S Symposium and URSI Radio Science Meeting, London, Ontario, June 24-28, 1991.

 

R. J. Marhefka, D. Bensman and D. DeCarlo, “A SATCOM Antenna Siting Study on an Aircraft Using the NEC-BSC V3.1,” 6th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 19-22, 1990.

 

R. J. Marhefka and T. J. Brinkley, “Comparison of Methods for Determining Currents on a Plate,” 6th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 19-22, 1990.

 

R. J. Marhefka, E. M. Bracalente and M. C. Gilreath, “Development of Numerical Electromagnetic - Basic Scattering Code for Space Station Applications a Description and Antenna Chamber Evaluation,” 1990 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Dallas, Texas, May 7-11, 1990.

 

R. J. Marhefka and L. P. Ivrissimtzis, “A Uniform Ray Approximation of the Scattering by Polyhedral Structures Using Wedge Currents,” 1990 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Dallas, Texas, May 7-11, 1990.

 

R. J. Marhefka and E. D. Constantinides, “Scattering From 2-D Superquadric Surfaces,” 1990 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Dallas, Texas, May 7-11, 1990.

 

R. J. Marhefka and L. P. Ivrissimtzis, “Edge Wave Diffraction for Flat Plates,” 1990 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Dallas, Texas, May 7-11, 1990.

 

L. P. Ivrissimtzis and R. J. Marhefka, “Edge Wave Vertex and Edge Diffraction,” URSI Radio Science Meeting, Boulder, Colorado, January 4-7, 1989. (Won Third Place in Best Student Paper Competition)

 

R. J. Marhefka and N. Akhter, “UTD Scattering from Dihedrals,” 5th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 21-24, 1989.

 

R. J. Marhefka and L. A. Takacs, “Far Zone Reflection from 2-D Superquadric Surfaces,” 1989 International IEEE/AP-S Symposium and URSI Radio Science Meeting, San Jose, California, June 26-30, 1989.

 

R. J. Marhefka, “Comments on Code Validation Issues with Emphasis on UTD,” Invited paper, 4th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 22-24, 1988.

 

R. J. Marhefka, “Development and Validation of a New Version of the NEC-BSC,” 4th Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 22-24, 1988.

 

R. J. Marhefka, J. D. Young, J. Gwynne and N. Akhter, “Diagnostic Backscattering Signature and Pattern Measurements of Triangular - Plate Dihedrals from 2 to 18 GHz and Comparison to Theory,” 1988 International IEEE/AP-S Symposium and URSI Radio Science Meeting, Syracuse, New York, June 6-10, 1988.

 

R. J. Marhefka and J. H. Choi, “Bistatic Scattering Analysis of an Ellipsoid,” 3rd Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 24-26, 1987.

 

R. J. Marhefka and J. W. Silvestro, “Recent Updates to the NEC-BSC,” 3rd Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 24-26, 1987.

 

R. J. Marhefka and W. Ebihara, “UTD Bistatic Scattering from a Cone Frustum,” 1987 International IEEE/AP-S Symposium and USNC/URSI Meeting, Blacksburg, Virginia, June 15-19, 1987.

 

R. J. Marhefka, “Analyzing Large Structures Using the NEC-BSC,” 2nd Annual Review, Applied Computational Electromagnetics Society, Naval Postgraduate School, Monterey, California, March 18-21, 1986.

 

R. J. Marhefka and K. Aberegg, “UTD Interaction between Plates for Backscatter,” 1985 International IEEE/AP-S Symposium and USNC/URSI Meeting, Vancouver, British Columbia, June 17-21, 1985.

 

J. D. Young and R. J. Marhefka, “Approximate Impulse Response of the Tip of a Flat Conducting Plate,” 1985 International IEEE/AP-S Symposium and USNC/URSI Meeting, Vancouver, British Columbia, June 17-21, 1985.

 

R. J. Marhefka, “Applications of UTD for Analyzing Scattering in Complex Environments,” Invited Paper, 22nd Annual Meeting, Society of Engineering Science, Pennsylvania State University, University Park, Pennsylvania, October 7-9, 1985.

 

R. J. Marhefka and K. C. Chiang, “UTD Bistatic Scattering from a Finite Cylinder,” 1984 International IEEE/AP-S Symposium and USNC/URSI Meeting, Boston, Massachusetts, June 25-28, 1984.

 

R. J. Marhefka, W. D. Burnside and E. L. Pelton, “An Iterative Approach for Computing an Antenna Aperture Distribution from Given Radiation Pattern Data,” 1979 International IEEE/AP-S Symposium and USNC/URSI Meeting, Seattle, Washington, June 18-22, 1979.

 

R. J. Marhefka and W. D. Burnside, “Simulations of Three-Dimensional Structures Using Flat Plates,” 1978 International IEEE/AP-S Symposium and USNC/URSI Meeting, College Park, Maryland, May 15-19, 1978.

 

R. J. Marhefka and W. D. Burnside, “Analysis of Wing-Mounted Antenna Patterns,” 1976 IEEE/AP-S Symposium and USNC/URSI Meeting, Amherst, Massachusetts, October 12-15, 1976.

 

W. D. Burnside, R. J. Marhefka and C. L. Yu, “A Study of KC-135 Aircraft Antenna Patterns,” 1974 International IEEE/AP-S Symposium and USNC/URSI Meeting, Atlanta, Georgia, June 10-12, 1974.

 

W. D. Burnside, R. J. Marhefka and C. L. Yu, “Roll Plane Analysis of On-Aircraft Antennas,” AGARD Symposium on Antennas for Avionics, Munich, Germany, November 1973.

 

W. D. Burnside, C. L. Yu and R. J. Marhefka, “A Technique to Combine the Geometrical Theory of Diffraction and the Moment Method,” 1973 International IEEE/G-AP Symposium and USNC/URSI Meeting, Boulder, Colorado, August 21-24, 1973.

 

W. D. Burnside, C. L. Yu and R. J Marhefka, “Analysis of Antennas on Aircraft,'' Array Antenna Conference, San Diego, California, February 22-24, 1972.

 

W. D. Burnside, C. L. Yu and R. J. Marhefka, “Analysis of the On-Aircraft Antenna Patterns,” 1972 International IEEE/G-AP Symposium and USNC/URSI Meeting held at Williamsburg, Virginia, December 11-15, 1972.

 

Contact Information:

email: marhefka.1@osu.edu

phone: (614) 292-5752

 

Last Revised: 08/19/08