About Us
Roberto RojasTeran
 Faculty Emeritus, Electrical & Computer Engr.

2015 Neil Ave
Columbus, OH 43210
 6142926671
About
Full Title
Professor of Electrical and Computer Engineering
Education
Ph.D. 1985, The Ohio State University
Areas of interest
Active and reconfigurable antennas/arrays, highfrequency techniques, electromagnetic scattering and radiation, electromagnetic theory and numerical techniques.
Office
205 Dreese Lab; ph: 614.292.6671 or 614.292.2530, fax: 614.292.7596
Honors

2003
Outstanding Technical Report. ElectroScience Laboratory.

2001
IEEE Fellow.

1993
Lumley Research Award. College of Engineering.

1990
Browder J. Thompson Memorial Prize. IEEE.

1989
Lumley Research Award. College of Engineering.

1988
Outstanding Paper. ElectroScience Laboratory.

1988
R.W.P. King Prize Paper Award. Antennas and Propagation society.

1985
Outstanding Ph.D. dissertation. ElectroScience Laboratory.

1981
Outstanding M.S. Thesis. ElectroScience Laboratory.
Chapters
2001
 R.G. Rojas and T.H. Lee. 2001. ""High Frequency Techniques"." In Handbook of Antennas in Wireless Communications, edited by Lal C. Godara, Boca Raton: CRC Press.
Journal Articles
2010
 N. Surittikul* and R.G. Rojas, 2010, ""Pattern Reconfigurable Printed Antenna for GPS Applications"." IEEE Trans. Antennas & Propagation
 N.K. Nahar* and R.G. Rojas, 2010, ""Efficient Freespace Coupling to LMAPCF by Aberration Correction"." IEEE Trans. Advanced Packaging
 K. Obeidat*, B.D. Raines* and R.G. Rojas, 2010, ""Application of Characteristic Modes and NonFoster Multiport Loading to the Design of Broadband Antennas"." IEEE Trans. Antennas & Propagation 58, 203  207.
 K. Obeidat*, B.D. Raines*, R.G. Rojas, 2010, ""Discussion of Series and Parallel Resonance Phenomena in the Input Impedance of Antennas"." Journal of Radio Science
 K. Obeidat*, B.D. Raines*, R.G. Rojas and B.T. Strojny*, 2010, ""Design of Frequency Reconfigurable Antennas Using the Theory of Characteristic Modes"." IEEE Trans. Antennas & Propagation 1,
2009
 Niru K. Nahar* and Roberto G. Rojas, 2009, ""Lowloss polynomial White cell optical truetime delay engine for wideband radio frequency array beam steering"." OSA  Applied Optics 48, 3921  3929.
 Shadi S. Alshannaq* and R.G. Rojas, 2009, ""Nonreciprocity in circular magnetoplasmafilled waveguides above the cyclotron frequency"." Journal of Applied Physics 106,
2008
 Xian Cui*, S.J. Doo*, P. Roblin, J. Strahler, and R.G. Rojas, 2008, ""High Efficiency RF Power Amplifier Designed with Harmonic Realtime Active Loadpull"." IEEE Microwave and Wireless Components Letter 18, 266  268.
 N. Nahar* and R.G. Rojas, 2008, ""Coupling Loss from FreeSpace to Large Mode Area Photonic Crystal Fibers"." IEEE/OSA Journal of Lightwave Technology 26, 3669  3676.
2006
 V. Erturk, B. Guner*, R.G. Rojas and O. Bakir*, 2006, ""Scan Blindness Phenomenon in Conformal Finite Phased Arrays of Printed Dipoles"." IEEE Trans. Antennas & Propagation 54, 1699  1708.
 K.W. Lee* and R.G. Rojas, 2006, ""Material Reflector for Cellular/PCS Array Applications"." Microwave and Optical Technology Letters 48, no. 9, 1890  1894.
 K.W. Lee*, R.G. Rojas and N. Suritikul*, 2006, ""A pattern reconfigurable microstrip antenna element"." Microwave and Optical Technology Letters 48, no. 6, 1117  1119.
2004
 V. Erturk, R.G. Rojas and K.W. Lee*, 2004, ""Analysis of Finite Arrays of Axially Directed Printed Dipoles on Electrically Large Circular Cylinders"." IEEE Trans. Antennas & Propagation 52, 2586  2595.
 B. Thors, L. Josefsson and R.G. Rojas, 2004, ""The RCS of a cylindrical array antenna coated with a dielectric layer"." IEEE Trans. Antennas & Propagation 52, 1851  1858.
2003
 V.B. Erturk* and R.G. Rojas, 2003, ""Efficient Analysis of Input Impedance and Mutual Coupling of Microstrip Antennas Mounted on Large Coated Cylinders"." IEEE Trans. Antennas & Propagation 51, 739  749.
 B. Thors* and R.G. Rojas, 2003, ""Uniform asymptotic solution for the radiation from a magnetic source on a large dielectric coated circular cylinder: Nonparaxial region"." Radio Science 38, no. 5, 1083  1096.
 Patrik Pearson* and Roberto G. Rojas, 2003, ""Highfrequency approximation for mutual coupling calculations between apertures on a perfect electric conductor circular cylinder covered with a dielectric layer: Nonparaxial region"." Radio Science 38, no. 4, 1079  1092.
2002
 V.B. Erturk* and R.G. Rojas, 2002, ""Paraxial SpaceDomain Formulation for Surface Fields on a Large Dielectric Coated Circular Cylinder"." IEEE Trans. Antennas and Propagation 50, 1577  1587.
2001
 R.G. Rojas and K.W. Lee*, 2001, ""Surface wave control in printed antennas using nonperiodic parasitic strips"." IEE Proceedings Microwaves, Antennas and Propagation 148, 25  28.
 V.B. Erturk*, R.G. Rojas, P. Roblin, 2001, ""Frequency selective loading for a transmitting active integrated antenna"." Microwave & Optical Technology Letters 31, no. 1, 3  5.
2000
 A. Valero and R.G. Rojas, 2000, ""Fast analysis of electromagnetic scattering from finite strip gratings on a grounded dielectric slab"." Radio Science 35, 1307  1314.
 V.B. Erturk* and R.G. Rojas, 2000, ""Efficient computation of surface fields excited on a dielectric coated circular cylinder"." IEEE Trans. Antennas & Propagation 48, 1507  1516.
1999
 V.B. Erturk*, R.G. Rojas and P. Roblin, 1999, ""Hybrid analysis/design method for active integrated antennas"." IEE Proceedings Microwaves, Antennas & Propagation 146, 131  137.
1998
 C. Bean*, P. Roblin, V. Erturk* and R. Rojas, 1998, ""A New PCB Substrate used for patch antennas fabrication"." Microwave Journal 41, no. 7, 122  132.
1997
 M.F. Otero* and R.G. Rojas, 1997, ""Resistive Treatment to Reduce the Edge Diffraction from Wedge Shaped Objects and Planar Antennas"." Radio Science 32, 1745  1759.
 M.F. Otero* and R.G. Rojas, 1997, ""Two Dimensional Green's function for a Wedge with Impedance Faces"." IEEE Trans. Antennas & Propagation AP45, 1799  1809.
1996
 M.F. Otero* and R.G. Rojas, 1996, ""EM Scattering from a Complex Material Cylinder in the Presence of an Impedance Wedge"." Journal of Electromagnetic Waves and Applications (JEWA) 10, 1563  1581.
1995
 L.M. Chou*, R.G. Rojas and P.H. Pathak, 1995, ""A WH/GSMT Based FullWave Analysis of Planar Transmission Lines Embedded in Multilayered Dielectric Substrates"." IEEE Trans. Microwave Theory and Techniques 43, 119  130.
 M.F. Otero* and R.G. Rojas, 1995, ""Synthesis of the Frequency Response of an Inhomogeneous Resistive Strip"." Annals of Telecommunications, special issue on RCS of complex objects 50, no. 56, 582  589.
1994
 H.C. Ly* and R.G. Rojas, 1994, ""EM plane wave diffraction by a material coated perfectly conducting halfplane  oblique incidence"." Microwave and Optical Technology Letters 7, 262  266.
 R.G. Rojas, 1994, ""Integral Equations for the EM Scattering by Homogeneous/Inhomogeneous Two Dimensional Chiral Bodies"." IEE Proceedings, Microwave, Antennas & Propagation 141, 385  392.
1993
 H.C. Ly*, R.G. Rojas and P.H. Pathak, 1993, ""EM Plane Wave Diffraction by a Planar Junction of Two Thin Material HalfPlanes  Oblique Incidence"." IEEE Trans. Antennas and Propagation 41, 429  441.
 R.G. Rojas and M.F. Otero*, 1993, ""Scattering by a resistive strip attached to an impedance wedge"." Journal of Electromagnetic Waves and Applications (JEWA) 7, no. 3, 373  402.
 H.C. Ly* and R.G. Rojas, 1993, ""Analysis of Diffraction by Material Discontinuities in Thin Material Coated Planar Surfaces Based on Maliuzhinets Method"." Radio Science 28, 281  297.
1992
 R.G. Rojas, 1992, ""Integral Equations for the Scattering by a Three Dimensional Inhomogeneous Chiral Body"." Journal of Electromagnetic Waves and Applications (JEWA) 6, 733  750.
1991
 R.G. Rojas, K.S. Sampath*, and W.D. Burnside, 1991, ""Analysis and Simulation of Collision Avoidance TCAS Antennas Mounted on Aircraft"." ACES Journal 6, 112  139.
 R.G. Rojas, H.C. Ly*, P.H. Pathak, and R. Tiberio, 1991, ""EM Plane Wave Diffraction by a ThreePart Thin, Planar Dielectric/Ferrite Slab"." Radio Science 26, 1267  1280.
 G. Pelosi, R. Tiberio, and R.G. Rojas, 1991, ""Electromagnetic field excited by a line source placed at the edge of an impedance wedge"." IEEE Trans. on Antennas and Propagation 39, 1043  1046.
 R.G. Rojas, H.C. Ly* and P.H. Pathak, 1991, ""EM Plane Wave Diffraction by a Planar Junction of Two Thin Dielectric/Ferrite HalfPlanes"." Radio Science 26, 641  660.
1990
 R.G. Rojas and L.M. Chou*, 1990, ""Diffraction by a Partially Coated PEC HalfPlane"." Radio Science 25, 175  188.
1989
 R.G. Rojas and P.H. Pathak, 1989, ""Diffraction of EM Waves Normally Incident on the Edge of a Thin Dielectric/Ferrite HalfPlane and Related Configuration"." IEEE Trans. Antennas and Propagation AP37, 751  763.
 R.G. Rojas and Z. Alhekail*, 1989, ""Generalized Impedance/Resistive Boundary Conditions for EM Scattering Problems"." Radio Science 24, 1  12.
1988
 R.G. Rojas, 1988, ""Scattering by an Inhomogeneous Dielectric/Ferrite Cylinder of Arbitrary CrossSection Shape  Oblique Incidence Case"." IEEE Trans. Antennas and Propagation AP36, no. 2, 238  246.
 R.G. Rojas, 1988, ""Generalized Impedance Boundary Conditions for EM Scattering Problems"." Electronics Letters 24, no. 17,
 R.G. Rojas, 1988, ""Electromagnetic Diffraction of an Obliquely Incident Plane Wave Field by a Wedge with Impedance Faces"." IEEE Trans. Antennas and Propagation AP36, no. 7, 956  970.
 R.G. Rojas, 1988, ""WienerHopf Analysis of the EM Diffraction by an Impedance Discontinuity in a Planar Surface and by an Impedance HalfPlane"." IEEE Trans. Antennas and Propagation AP36, no. 1, 71  83.
1987
 R.G. Rojas, 1987, ""Comparison Between Two Asymptotic Methods"." IEEE Trans. Antennas and Propagation AP35, no. 12, 1489  1492.
1986
 P.H. Pathak and R.G. Rojas, 1986, ""A UTD Analysis of the EM Diffraction by an Impedance Discontinuity in a Planar Surface"." Journal of WaveMaterial Interaction 1, 16  33.
Presentations
 ""Research in Antenna Technology"." 2005, Dayton,
 ""Nonreciprocal Microwave Devices Based on Magnetized Semiconductors"." 2008, Presented at MURI Annual Review, Columbus,
 ""Multifunctional Design of Load Bearing Antenna Structure for Small UAV's (STTR Ph II)"." 2007, Presented at Air Force Office of Scientific Research Contractors' Meeting, Monterrey,
 ""Multifunctional Design of Load Bearing Antenna Structure for Small UAV's (STTR Ph II)"." 2008, Presented at Air Force Office of Scientific Research Contractors' Meeting, Arlington,
 ""College of Engineering at The Ohio State University: Graduate programs, Columbus"." 2007,
 ""Beam Steering of 4Element RF Phased Array Antenna with White Cell OTTD Engine"." 2007, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus,
 ""New antenna concepts for wireless antennas"." 1999, Presented at EM Range Consortium Meeting, Columbus,
 ""Material Characterization of Thin Films and Reconfigurable RF Systems"." 2008, Presented at GameChanger Annual Review, Columbus,
 ""New Concepts for Passive and Active Integrated Antennas"." 2002, Cleveland,
 ""Phased Array Antenna Using Optical True Time Delay Engine"." 2005, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus,
 ""Anechoic Chamber in the Sky"." 2009, Presented at Compact Range Consortium Annual Meeting, Columbus,
 ""Introduction to Antennas"." 2005, Columbus,
 ""Introduction to EMC"." 1998, Kaohshiung,
 ""Hybrid analysis/design techniques for EM radiation and scattering"." 1998, Taipei,
 ""Hybrid Analysis/Design techniques for Antennas"." 1998, Kaohshiung,
 ""An analysis/design method for active integrated antennas"." 1998, Kaohshiung,
 ""Time Domain Method of Characteristic Modes for Analysis/Design of Antennas"." 2006, Presented at Annual Program Review of Dr. Sjogren (AFOSR),
 ""Beam Steering of Phased Array Antenna with Optical Quadratic White Cell True Time Delay Engine"." 2006, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus,
 ""Multifunctional Design of Load Bearing Antenna Structure for Small UAV's"." 2006, Presented at Air Force Office of Scientific Research Contractors' Meeting, Seattle,
 ""Antenna Research at the ElectroScience Laboratory"." 2007,
 ""Reconfigurable GPS Antenna"." 2001, Presented at EM Range Consortium Meeting, Columbus,
 ""Nonreciprocal devices operating at millimeter and submillimeter wavelengths"." 2006, Presented at EM AFRL/AFOSR Electromagnetics Workshop, San Antonio,
 ""Scattering from arbitrarily shaped material bodies placed at the tip of an impedance wedge"." 1992, Presented at EM Range Consortium Meeting, Columbus,
 ""Nonreciprocal devices based on semiconductor magnetoplasmons"." 2005, Presented at OSUBattelle research forum,
 ""Integrated Wireless Communication Systems Laboratory"." 2005, Columbus,
 ""Active Integrated Antenna Arrays and NonReciprocal Devices at Millimeter and Submillimeter wavelengths"." 2005, Presented at OSUBattelle research forum II,
 ""Microwave & Optical Phase Arrays for NASA Applications"." 2004, Cleveland,
 ""Reconfigurable Antenna for GPS Receiver"." 2003, Presented at EM Measurements Consortium Meeting, Columbus,
 ""Active Integrated Array for Beam Scanning Application"." 2003, Presented at EM Measurements Consortium Meeting, Columbus,
 ""Use of Rcard to reduce Pylon scatter"." 1991, Presented at EM Range Consortium Meeting, Columbus,
Papers in Proceedings
2010
 J.S. Lee* and R.G. Rojas ""Electromagnetic Material Characterization of OnWafer Anisotropic ThinFilm Materials"." in IEEE International Symposium on Antennas and Propag. and CNC/USNC/URSI National Science Meeting. Toronto, (7 2010).
 S.S. Alshannaq* and R.G. Rojas ""Integrated SPDT Switch Based in Slotlines on Semiconductor Substrates Biased with a DC Magnetic Field"." in IEEE International Symposium on Antennas and Propag. and CNC/USNC/URSI National Science Meeting. Toronto, (7 2010).
 B.T. Strojny* and R.G. Rojas ""Volume Integrated Conformal UAV Antennas"." in URSI US National Radio Science Meeting. Boulder, (1 2010).
 I.A. Osaretin* and R.G. Rojas ""Implementation and Modeling of Bianisotropic Media with Magnetoelectric Laminated Composites and Application to Nonreciprocal Devices"." in IEEE International Symposium on Antennas and Propag. and CNC/USNC/URSI National Science Meeting. Toronto, (7 2010). 1  4.
 S.S. Alshannaq* and R.G. Rojas ""Millimeter Wave Isolator Based on Thin Film Magnetized Semiconductors in FullyPlanar Waveguide"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
 B.D. Raines* and R.G. Rojas ""Design of Multiband Reconfigurable Antennas"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
 B.T. Strojny* and R.G. Rojas ""Characteristic Mode Analysis of Electrically Large Conformal Bifilar Helical Antenna"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
 I.A. Osaretin* and R.G. Rojas ""Magnetic Semiconductors for Millimeterwave NonReciprocal Device Applications"." in URSI US National Radio Science Meeting. Boulder, (1 2010).
 S.S. Alshannaq* and R.G. Rojas ""Roomtemperature Faradayrotation Isolator Based on Magnetized Semiconductors"." in URSI US National Radio Science Meeting. Boulder, (1 2010).
 K.S. Song and R.G. Rojas ""Electrically Small Wire Monopole Antenna With NonFoster Impedance Element"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
 J.I. Martinez Lopez, R. Moussounda*, and R.G. Rojas ""Nonreciprocal Coupling Network for Beam Steering Coupled Oscillator Arrays"." in IEEE International Symposium on Phased Array Systems & Technology. Boston, (10 2010). 1  4.
 K.S. Song* and R.G. Rojas ""NonFoster Impedance Matching for Wide BandWidth. Electrically Small Antennas"." in IEEE International Symposium on Antennas and Prog. and CNC/USNC/URSI National Science Meeting. Toronto, (7 2010). 1  4.
 I.A. Osaretin* and R.G. Rojas ""Planar Bianisotropic Waveguides for Application in Microwave Devices"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
 J.S. Lee* and R.G. Rojas ""Electromagnetic Characterization Method for OnWafer Magnetic Dielectric Thin Film Materials"." in 4th European Conference on Antennas and Propagation (EUCAP). Barcelona, (4 2010). 1  4.
2009
 K. Obeidat*, R.G. Rojas, B. Raines* ""Design of Antenna Conformal to Vshaped Tail of UAV Based on the Method of Characteristic Modes"." in 3rd European Conference on Antennas and Propagation (EUCAP). Berlin, (3 2009). 1  4.
 Niru K. Nahar*, B. Raines*, B. Strojny* and R.G. Rojas ""RF Array Beam Steering with FreeSpace Optical TrueTime Delay Engine"." in IEEE International Symposium on Antennas and Prog. and USNC/URSI National Science Meeting. Charleston, (6 2009).
 B. Strojny* and R.G. Rojas ""Integration of Conformal GPS and VHF/UHF Communication Antennas for Small UAV Applications"." in 3rd European Conference on Antennas and Propagation (EUCAP). Berlin, (3 2009). 1  4.
 K.A. Obeidat*, B.D. Raines* and R.G. Rojas ""Antennas Input Impedance's Resonance in Terms of Characteristic Modes"." in IEEE International Symposium on Antennas and Propag. and USNC/URSI National Science Meeting. Charleston, (6 2009).
 S. Alshannaq* and R.G. Rojas ""Novel Planar Circulator Based on Magnetized Semiconductor Plasma"." in URSI US National Radio Science Meeting. Boulder, (1 2009).
 S.S. Alshannaq* and R.G. Rojas ""Fully Planar RoomTemperature Circulator Based on Magnetized Semiconductors"." in IEEE International Symposium on Antennas and Propag. and USNC/URSI National Science Meeting. Charleston, (6 2009). 1  4.
 S. Mutha*, P. Roblin, D. Chaillot, Xi Yang*, J. Kim*, J. Strahler, R.G. Rojas, J. Volakis ""Technique for Joint Balancing of IQ ModulatorDemodulator Chains in Wireless Transmitters"." in 2009 IEEE MTT Symposium Digest. (1 2009). 221  224.
2008
 K.A. Obeidat*, B.D. Raines* and R.G. Rojas ""Design and Analysis of a Helical Spherical Antenna Using"." in IEEEAPS International Symposium. San Diego, (7 2008). 1  4.
 Shadi S. Alshannaq* and Roberto G. Rojas ""Planar Slotline Isolator Based on Semiconductor Magnetoplasma"." in 2008 URSI National Meeting. Boulder, (1 2008).
 K.A. Obeidat*, B.D. Raines* and R.G. Rojas ""Design of OmniDirection Vertically Polarized Veeshaped Antenna Using Characteristic Modes"." in 2008 URSI National Meeting. Boulder, (1 2008).
 A. Akour*, M. Ismail and R.G. Rojas ""Design of Manufacturable 60GHz CMOS LNAs"." in SDR. Washington, (10 2008).
 B.D. Raines*, K.A. Obeidat*, and R.G. Rojas ""Characteristic ModeBased Design and Analysis of an Electrically Small Planar Spiral Antenna with Omnidirectional Pattern the Theory of Characteristic Modes"." in IEEEAPS International Symposium. San Diego, (7 2008). 1  4.
 S. Alshannaq* and R.G. Rojas ""On the Modeling of Metallic Waveguides from DC to Light"." in URSI General Assembly. Chicago, (8 2008).
 R.G. Rojas, V.B. Erturk, P. Persson and B. Thors* ""Hybrid HighFrequency Asymptotic/MoM Technique for Analysis of Conformal Antennas/Arrays on Large Dielectric Coated Cylinders"." in 2008 International URSI Meeting. San Diego, (7 2008).
2007
 S.S. Alshannaq* and R.G. Rojas ""Coaxial Magnetoplasma Isolator Operating near the Cyclotron Frequency"." in 2007 USNC/URSI North American Radio Science Meeting. Ottawa, (7 2007).
 K. Obeidat*, B.D. Raines*, and R.G. Rojas ""Broadband Antenna Pattern Synthesis Using Characteristic Modes"." in 2007 USNC/URSI North American Radio Science Meeting. Ottawa, (7 2007).
 K.S. Song* and R.G. Rojas ""Efficient Modeling of Frequency Dependent Lumped Element Circuits for Single and Coupled Interconnects on Lossy Substrate"." in 2007 USNC/URSI North American Radio Science Meeting. Ottawa, (7 2007).
 K.S. Song* and R.G. Rojas ""Extraction of Frequency Dependent Series Impedance for Single Interconnect on Lossy Substrates by using PMC and PEC Conditions"." in 2007 IEEE APS International Symposium. Honolulu, (6 2007).
 I. Suh*, S.J. Doo*, P. Roblin, X. Cui*, Y.G. Kim*, J. Strahler, M.V. Bossche, R. Rojas, and H.D. Park ""Negative input resistance and realtime active loadpull measurements of a 2.5GHz oscillator using a LSNA"." in 69th ARFTG Conference Digest. Honolulu, (6 2007).
 K. Obeidat*, B.D. Raines* and R.G. Rojas ""Antenna Design and Analysis Using Characteristics Modes"." in 2007 IEEE APS International Symposium. Honolulu, (6 2007).
 S.J. Doo*, P. Roblin, V. Balasubramanian, R. Taylor, K. Dandu, G.H. Jessen and R. Rojas ""Adaptive second harmonic active load for pulsedIV/RF classB operation"." in ARFTG 70th Conference. Tempe, (11 2007).
2006
 R.G. Rojas, C.K. Lai* and S. Alshannaq* ""Nonreciprocal devices based on magnetoplasmons I semiconductor materials"." in USNC/URSI National Radio Science Meeting. Albuquerque, (7 2006).
 X. Cui*, S.J. Coo*, P. Roblin, G.H. Jessen, R.G. Rojas, J. Strahler ""Realtime Active Loadpull of the 2nd & 3rd Harmonics for Interactive Design of NonLinear Power Amplifiers"." in 68th ARFTG Conference. Broomfield, (11 2006).
 C.K. Lai* and R.G. Rojas ""Generalized Transverse Resonance Method for Design and Analysis of Semiconductor MagnetoplasmonBased Nonreciprocal Devices"." in 2006 IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials. White Plains, (3 2006).
 C.H. Mueller, R.G. Rojas, J.A. Nessel and F.A. Miranda ""Optical Phased Array Antennas Using Coupled Vertical Cavity Surface Emitting Lasers"." in Great Lakes Photonics Symposium. Dayton, (6 2006).
 N. Surittikul* and R.G. Rojas ""Computation of the Antenna Quality Factor Using Time Domain Method of Characteristic Modes"." in USNC/URSI National Radio Science Meeting. Albuquerque, (7 2006).
2005
 N. Surittikul* and R.G. Rojas ""Time Domain Method of Characteristic Modes for the Analysis/Design of Antennas"." in 2005 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Washington, (7 2005).
 N.K. Nahar* and R.G. Rojas ""Free space coupling properties of large mode area Photonic Crystal Fibers"." in 2005 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Washington, (7 2005).
 Chun Kit Lai* and R.G. Rojas ""Design and analysis of passive nonreciprocal devices in millimeter and submillimeter wavelengths"." in 2005 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Washington, (7 2005).
2004
 R.G. Rojas and F.A. Miranda ""Microwave & Optical Phase Arrays for NASA Applications"." in Great Lakes Photonics Symposium. Cleveland, (6 2004).
 N. Surittikul* and R.G. Rojas ""Analysis of Reconfigurable Printed Antenna using Characteristic Modes: FDTD Approach"." in 2004 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Monterey, (6 2004).
 R.G. Rojas, A. Buurma*, K. Idstein* and G. Creech ""A Rigorous Approach to Lumped Element Circuit Models for Monolithic Inductors"." in 2004 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Monterey, (6 2004).
 P. Persson, B. Thors and R.G. Rojas ""An Improved Numerical Approach for Surface Field Calculations on Large Dielectric Coated PEC Circular Cylinders using Asymptotic Techniques"." in Computational Electromagnetics  Methods and Applications (EMB04). Gothenburg, (10 2004). 252  259.
 V.B. Erturk, R.G. Rojas and B. Gunner* ""Scan Blindness of Conformal Phased Arrays of Printed Dipoles"." in 2004 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Monterey, (6 2004).
 S. Iyer* and R.G. Rojas ""Design and Analysis of Switching Circuits for Reconfigurable Antennas"." in 2004 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Monterey, (6 2004).
2003
 N. Surittikul*, R.G. Rojas and K.W. Lee ""Reconfigurable Circularly Polarized DualBand Stacked Microstrip Antenna"." in 2003 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Columbus, (6 2003).
 Kevin Idstein*, Roberto G. Rojas and Gregory Creech ""Modeling of Planar Inductors in IC's at XBand"." in 2003 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Columbus, (6 2003).
 K.W. Lee* and R.G. Rojas ""Active Integrated Phased Array"." in 2003 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Columbus, (6 2003).
 B. Thors*, L. Josefsson and R.G. Rojas ""Scattering from a cylindrical array antenna coated with a dielectric layer"." in 2003 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Columbus, (6 2003).
 Patrik Persson*, Bjorn Thors* and Roberto G. Rojas ""An Improved Algorithm for Surface Field Calculations on Large Dielectric Covered Circular Cylinders using Asymptotic Techniques"." in 2003 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Columbus, (6 2003).
2002
 B. Thors* and R.G. Rojas ""Radiation Pattern Calculations for a Magnetic Current Mounted on a Large Dielectric Coated PEC Circular Cylinder"." in 2002 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. San Antonio, (6 2002).
 R.G. Rojas, V.B. Erturk, P. Persson, K.W. Lee* and B. Thors* ""Efficient Analysis of Conformal Antennas on a Large Dielectric Coated Cylinder"." in 2002 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. San Antonio, (6 2002).
 K.W. Lee*, N. Siruttikul* and R.G. Rojas ""Surface Wave Control for Reconfigurable Printed Antenna Applications"." in 2002 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. San Antonio, (6 2002).
 R.G. Rojas, K.W. Lee* and N. Surittikul* ""Reconfigurable GPS antenna"." in National Radio Science Meeting (URSI). Boulder, (1 2002). 21 
 V.B. Erturk, K.W. Lee* and R.G. Rojas ""Analysis of Finite Phased Arrays of Printed Dipoles on Electrically Large Cylinders"." in 2002 IEEEAPS International Symposium and USNC/URSI National Radio Science Meeting. San Antonio, (6 2002).
2001
 V.B. Erturk and R.G. Rojas ""Paraxial spacedomain formulation for surface fields on large dielectric coated circular cylinder"." in 2001 IEEEAPS International Symposium/URSI National Radio Science Meeting. Boston, (7 2001).
 R.G. Rojas and K.W. Lee* ""Material reflector for cellular/PCS antenna applications"." in 2001 IEEEAPS International Symposium/URSI National Radio Science Meeting. Boston, (7 2001).
 P. Persson* and R.G. Rojas ""Efficient Technique for Mutual Coupling Calculations Between Apertures on a PEC Circular Cylinder Covered with a Dielectric Layer"." in 2001 IEEEAPS International Symposium/URSI National Radio Science Meeting. Boston, (7 2001).
 V.B. Erturk, K.W. Lee* and R.G. Rojas ""Mutual coupling between microstrip line fed printed antennas on large coated cylinder"." in 2001 IEEEAPS International Symposium/URSI National Radio Science Meeting. Boston, (7 2001).
 P. Persson* and R.G. Rojas ""Development of a High Frequency Technique for Mutual Coupling Calculations Between Apertures on a PEC Circular Cylinder Covered with a Dielectric Layer"." in Electromagnetic ComputationsMethods and Applications (EMB01). Uppsala, (11 2001).
 P. Persson* and R.G. Rojas ""Asymptotic Green's function/MoM Technique for Mutual Coupling Calculations Between Apertures on a PEC Circular Cylinder Covered with a Dielectric Layer"." in 2nd European Workshop on Conformal Antennas. The Hauge, (4 2001).
2000
 A. ValeroNogueira, R.G. Rojas ""Fast solution of EM scattering by large finite array of strips on a grounded dielectric slab"." in 2000 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Salt Lake City, (7 2000).
 K.W. Lee* and R.G. Rojas ""Novel scheme for design of adaptive printed antenna elements"." in 2000 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Salt Lake City, (7 2000).
 V.B. Erturk*, R.G. Rojas ""Hybrid MoM/Green's function analysis of printed antennas mounted on large coated cylinder"." in 2000 IEEE APS International Symposium and USNC/URSI National Radio Science Meeting. Salt Lake City, (7 2000).
1999
 A. ValeroNogueira and R.G. Rojas ""Efficient SpectralBased Scheme for Fast matrixvector product algorithm"." in International Microwave and Optoelectronics Conference. Rio de Janeiro, (8 1999).
 R.G. Rojas ""A novel adaptive antenna element for GPS applications"." in AFOSR conference, Contractor's meeting and spring technical review. Minnowbrook, (4 1999).
 V.B. Erturk* and R.G. Rojas ""Efficient computation of surface fields excited on a dielectric coated circular cylinder"." in International Microwave and Optoelectronics Conference. Rio de Janeiro, (8 1999).
 R.G. Rojas ""Novel Antenna Design/Analysis Concepts"." in NATO workshop on smart structures. Amsterdam, (9 1999).
 K.W. Lee* and R.G. Rojas ""Study of Novel adaptive printed antenna element using surface waves"." in 1999 IEEE APS International Symposium & USNC/URSI National Radio Science Meeting. Orlando, (7 1999).
1998
 R.G. Rojas and K.W. Lee* ""Control of Surface Waves in Planar Printed Antennas"." in IEEE APS International Symposium and URSI Radio Science Meeting. Atlanta, (6 1998).
 R.G. Rojas and V. Erturk* ""UTD ray analysis of mutual coupling and radiation for antennas mounted on dielectric coated PEC convex surfaces"." in URSI 1998 International Symposium on Electromagnetic Theory. Thessaloniki, (5 1998).
1997
 V.B. Erturk*, R.G. Rojas and P. Roblin ""An Analysis Method for Active Integrated Antennas"." in 1997 PIERS Symposium. Cambridge, (7 1997).
 C. Bean*, P. Roblin, V. Erturk* and R.G. Rojas ""New PCB substrate used for patch antenna fabrication"." in Wireless Circuits, Interconnection, and Assembly Workshop. Carefree, (10 1997).
 R.J. Burkholder, R. Lee, P.H. Pathak and R.G. Rojas ""Hybrid Techniques for Analysis of EM Radiation and Scattering"." in 1997 IEEE APS Internatinoal Symposium and URSI North American Radio Science Meeting (Short course). Montreal, (7 1997).
 C. Demirdag* and R.G. Rojas ""Mutual Coupling Calculations on a Dielectric Coated PEC Cylinder using a UTDbased Green's function"." in IEEE APS International Symposium and URSI Radio Science Meeting. Montreal, (7 1997).
1996
 V.B. Erturk*, R.G. Rojas and P. Roblin ""Design/Analysis of an Active Integrated Antenna"." in IEEE/APS International Symposium and URSI Radio Science Meeting. Baltimore, (7 1996).
 M.F. Otero* and R.G. Rojas ""Numerical Diffraction Coefficient for an Impedance Wedge with a Material Body Attached to its Edge"." in 12th Annual Review of Progress in Applied Computational Electromagnetics. Monterey, (3 1996).
 R.G. Rojas and P.H. Pathak ""Application of Modern Analytical and Hybrid Tools for Antenna Modeling and Synthesis"." in 12th Annual review of Progress in Applied Computational Electromagnetics (Short course). Monterey, (3 1996).
1995
 R.G. Rojas, M.F. Otero*, D. Colak* and W.D. Burnside ""Synthesis of Tapered Resistive Ground Plane for a Microstrip Antenna"." in IEEE/APS International Symposium and Radio Science Meeting. Newport Beach, (6 1995).
 M.F. Otero* and R.G. Rojas ""Analysis and Treatment of Edge Effects on the Radiation Pattern of a Microstrip Patch Antenna"." in IEEE/APS International Symposium and Radio Science Meeting. Newport Beach, (6 1995).
1994
 M.F. Otero* and R.G. Rojas ""Radiation/Scattering of complex material body of arbitrary shape in the presence of an impedance wedge"." in IEEE/APS International Symposium and Radio Science Meeting. Seattle, (6 1994).
1993
 E.H. Newman, R.G. Rojas, T. Scheick, H.T. Shamansky, F.T. Klevenow*, E.W. Braeden*, K.S. Sampath*, G. Barber ""The helicopter antenna radiation prediction code (HARP)"." in Second Government Workshop on Ground Penetrating Radar. Columbus, (10 1993).
 E.H. Newman, R.G. Rojas, J.T. Scheick, H.T. Shamansky, F.T. Klevenow*, E.W. Braeden*, K.S. Sampath* and G. Barber ""The Helicopter Antenna Radiation Prediction Code"." in IEEE/APS International Symposium and Radio Science Meeting. Ann Arbor, (6 1993).
 H.T. Shamansky, E.H. Newman and R.G. Rojas ""Electromagnetic Modeling Using Graphical Workstations  A Case Study"." in IEEE/APS International Symposium and Radio Science Meeting. Ann Arbor, (6 1993).
 K.S. Sampath* and R.G. Rojas ""Application of the Helicopter Antenna Radiation Prediction Code (HARP) to Modeling Fixed Wing Aircraft"." in IEEE/APS International Symposium and Radio Science Meeting. Ann Arbor, (6 1993).
 M.F. Otero* and R.G. Rojas ""Scattering and Radiation in the Presence of a Material Loaded c Impedance Wedge"." in IEEE/APS International Symposium and Radio Science Meeting. Ann Arbor, (6 1993).
1992
 H.C. Ly*, R.G. Rojas, P.H. Pathak ""Diffraction from a twopart planar material junction: Oblique Incidence case"." in IEEE/APS International Symposium and Radio Science Meeting. Chicago, (7 1992).
 L.M. Chou*, R.G. Rojas, P.H. Pathak ""A WH/GSMT Based FullWave Analysis of Multilayered Printed Transmission Lines"." in IEEE/APS International Symposium and Radio Science Meeting. Chicago, (7 1992).
 S. Ozeki and R.G. Rojas ""Symmetry Analysis of ChiroDielectric Waveguides"." in Meeting on Microwave Circuits and Devices, Inst. of Electronics, Information and Communication Engineers. Tokyo, (6 1992).
 L.M. Chou*, R.G. Rojas and P.H. Pathak ""A WH/GSMT Based FullWave Analysis of the Power Leakage from Conductorbacked Coplanar Waveguides"." in MTT International Symposium. Albuquerque, (6 1992).
 R.G. Rojas and M. Otero* ""Scattering by a ChiroDielectric Body in the presence of an Impedance Wedge"." in IEEE/APS International Symposium and Radio Science Meeting. Chicago, (7 1992).
 R.G. Rojas ""Prediction of Mounted Antenna's Radiation Pattern Using the GTD/UTD Approach"." in PT. Industri Pesawat Terbang Nusantara (IPTN) (Short course). Banbung, (11 1992).
 H.C. Ly*, R.G. Rojas, P.H. Pathak ""Diffraction from a twopart planar material junction: Oblique Incidence case"." in IEEE/APS International Symposium and Radio Science Meeting. Chicago, (7 1992).
 H.C. Ly*, R.G. Rojas and P.H. Pathak ""Application of the Maliuzhinets' Method to Diffraction Problems Involving Generalized Impedance Boundary Conditions"." in IEEE/APS International Symposium and Radio Science Meeting. Chicago, (7 1992).
1991
 R.G. Rojas and L.M. Chou* ""Generalized Impedance/Resistive Boundary Conditions for a Planar Chiral Slab"." in IEEE/APS International Symposium and Radio Science Meeting. London, (6 1991).
 K.S. Sampath*, R.G. Rojas and W.D. Burnside ""Analysis and Simulation of Collision Avoidance TCAS Antennas Mounted on Aircraft"." in IEEE/APS International Symposium and Radio Science Meeting. London, (6 1991).
 R.G. Rojas and M.F. Otero* ""Synthesis of the Frequency Response of an Inhomogeneous Resistive Strip"." in IEEE/APS International Symposium and Radio Science Meeting. London, (6 1991).
 R.G. Rojas and M.F. Otero* ""Diffraction by a Resistive Strip Attached to an Impedance Wedge"." in IEEE/APS International Symposium and Radio Science Meeting. London, (6 1991).
1990
 R.G. Rojas ""Integral Equations for the Scattering by Two and Three Dimensional Inhomogeneous Chiral Bodies"." in IEEE/APS International Symposium and Radio Science Meeting. Dallas, (5 1990).
 R.G. Rojas, H.C. Ly*, P.H. Pathak, and R. Tiberio ""EM Plane Wave Diffraction by a TwoandThreePart Thin, Planar Dielectric/Ferrite Slab"." in IEEE/APS International Symposium and Radio Science Meeting. Dallas, (5 1990).
 R.G. Rojas, H.C. Ly* and P.H. Pathak ""High Frequency Diffraction by an Inhomogeneous Thin Dielectric Strip"." in XXIII General Assembly of URSI. Prague, (8 1990).
1989
 R.G. Rojas and Y.C. Chen* ""Improved Computer Simulation of the TCAS III Circular Array Mounted on an Aircraft"." in IEEE/APS International Symposium and Radio Science Meeting. San Jose, (6 1989).
 M. Calamia, G. Pelosi, R. Tiberio, R.G. Rojas ""Electromagnetic Field Excited by a Line Source Placed at The Edge of an Impedance Wedge"." in SBMO International Microwave Symposium. Sao Paulo, (7 1989).
 R.G. Rojas and L.M. Chou* ""Diffraction by a Partially Coated PEC HalfPlane"." in IEEE/APS International Symposium and Radio Science Meeting. San Jose, (6 1989).
1988
 R.G. Rojas, L.M. Chou*, P.H. Pathak ""Diffraction by a Magnetic Dielectric HalfPlane Using Generalized Impedance/Resistive Boundary Conditions"." in IEEE/APS International Symposium and Radio Science Meeting. Syracuse, (6 1988).
1987
 R.G. Rojas, P.H. Law* and W.D. Burnside ""Simulation of the Enhanced Traffic Alert and Collision Avoidance Systems (TCAS II)"." in IEEE/APS International Symposium and Radio Science Meeting. Blacksburg, (6 1987).
1986
 R.G. Rojas ""A UTD Formulation for the EM Diffraction by a Wedge with Impedance Faces and with Included Angles Equal to 0, /2 and (Oblique Incidence)"." in IEEE/APS International Symposium and Radio Science Meeting. Philadelphia, (6 1986).
1985
 R.G. Rojas and P.H. Pathak ""A UTD Analysis of the Diffraction by a Thin Dielectric/Ferrite HalfPlane (Oblique Incidence Case)"." in IEEE/APS International Symposium and Radio Science Meeting. Vancouver, (6 1985).
 R.G. Rojas ""Scattering by a Dielectric Cylinder of Rectangular Cross Section with Oblique Incidence"." in IEEE/APS International Symposium and Radio Science Meeting. Vancouver, (6 1985).
 R. Tiberio, G. Pelosi, G. Manara, P.H. Pathak and R.G. Rojas ""GTD Analysis of the Coupling Between Two Slots Separated by an Impedance Patch on a Ground Plane"." in IEEE/APS International Symposium and Radio Science Meeting. Vancouver, (6 1985).
1983
 P.H. Pathak and R.G. Rojas ""A Uniform GTD Analysis of the EM Diffraction by a ThinDielectric HalfPlane"." in IEEE/APS International Symposium and Radio Science Meeting. Houston, (5 1983).
1982
 P.H. Pathak and R.G. Rojas ""EM Diffraction by Thin Dielectric HalfPlane"." in Workshop/Symposium on Research Techniques and Wave Propagation and Scattering, sponsored by the U.S. Army Research Office, U.S. Office of Naval Research and The Ohio State University. Columbus, (10 1982).