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Roberto Rojas-Teran

  • Professor, Electrical & Computer Engr.
  • 142 Hitchcock Hall
    2070 Neil Avenue
    Columbus, OH 43210
  • 614-292-6671

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, high-frequency 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. .

  • 2001

    IEEE Fellow.

  • 1993

    Lumley Research Award. .

  • 1990

    Browder J. Thompson Memorial Prize. .

  • 1989

    Lumley Research Award. .

  • 1988

    Outstanding Paper. .

  • 1988

    R.W.P. King Prize Paper Award. .

  • 1985

    Outstanding Ph.D. dissertation. .

  • 1981

    Outstanding M.S. Thesis. .

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 Free-space Coupling to LMA-PCF by Aberration Correction"." IEEE Trans. Advanced Packaging
  • K. Obeidat*, B.D. Raines* and R.G. Rojas, 2010, ""Application of Characteristic Modes and Non-Foster 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, ""Low-loss polynomial White cell optical true-time 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 magnetoplasma-filled 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 Real-time Active Load-pull"." IEEE Microwave and Wireless Components Letter 18, 266 - 268.
  • N. Nahar* and R.G. Rojas, 2008, ""Coupling Loss from Free-Space 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, ""High-frequency 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 Space-Domain 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 non-periodic 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 AP-45, 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 Full-Wave 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. 5-6, 582 - 589.

1994

  • H.C. Ly* and R.G. Rojas, 1994, ""EM plane wave diffraction by a material coated perfectly conducting half-plane - 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 Half-Planes - 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 Three-Part 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 Half-Planes"." Radio Science 26, 641 - 660.

1990

  • R.G. Rojas and L.M. Chou*, 1990, ""Diffraction by a Partially Coated PEC Half-Plane"." 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 Half-Plane and Related Configuration"." IEEE Trans. Antennas and Propagation AP-37, 751 - 763.
  • R.G. Rojas and Z. Al-hekail*, 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 Cross-Section Shape - Oblique Incidence Case"." IEEE Trans. Antennas and Propagation AP-36, 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 AP-36, no. 7, 956 - 970.
  • R.G. Rojas, 1988, ""Wiener-Hopf Analysis of the EM Diffraction by an Impedance Discontinuity in a Planar Surface and by an Impedance Half-Plane"." IEEE Trans. Antennas and Propagation AP-36, no. 1, 71 - 83.

1987

  • R.G. Rojas, 1987, ""Comparison Between Two Asymptotic Methods"." IEEE Trans. Antennas and Propagation AP-35, 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 Wave-Material 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 4-Element 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 sub-millimeter 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,
  • ""Non-reciprocal devices based on semiconductor magnetoplasmons"." 2005, Presented at OSU-Battelle research forum,
  • ""Integrated Wireless Communication Systems Laboratory"." 2005, Columbus,
  • ""Active Integrated Antenna Arrays and Non-Reciprocal Devices at Millimeter and Sub-millimeter wavelengths"." 2005, Presented at OSU-Battelle 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 R-card 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 On-Wafer Anisotropic Thin-Film 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 Non-reciprocal 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 Fully-Planar 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 Millimeter-wave Non-Reciprocal Device Applications"." in URSI US National Radio Science Meeting. Boulder, (1 2010).
  • S.S. Alshannaq* and R.G. Rojas ""Room-temperature Faraday-rotation 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 Non-Foster 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 ""Non-Foster Impedance Matching for Wide Band-Width. 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 On-Wafer 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 V-shaped 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 Free-Space Optical True-Time 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 Room-Temperature 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 Modulator-Demodulator 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 IEEE-APS 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 Vee-shaped 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 Mode-Based Design and Analysis of an Electrically Small Planar Spiral Antenna with Omnidirectional Pattern the Theory of Characteristic Modes"." in IEEE-APS 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 High-Frequency 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 AP-S 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 real-time active load-pull 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 AP-S 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 pulsed-IV/RF class-B 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 ""Real-time Active Load-pull of the 2nd & 3rd Harmonics for Interactive Design of Non-Linear 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 Magnetoplasmon-Based 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 AP-S 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 AP-S 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 sub-millimeter wavelengths"." in 2005 IEEE AP-S 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 AP-S 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 AP-S 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 AP-S 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 AP-S 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 Dual-Band Stacked Microstrip Antenna"." in 2003 IEEE AP-S 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 X-Band"." in 2003 IEEE AP-S 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 AP-S 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 AP-S 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 AP-S 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 AP-S 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 AP-S 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 AP-S 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 IEEE-AP-S International Symposium and USNC/URSI National Radio Science Meeting. San Antonio, (6 2002).

2001

  • V.B. Erturk and R.G. Rojas ""Paraxial space-domain formulation for surface fields on large dielectric coated circular cylinder"." in 2001 IEEE-AP-S 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 IEEE-AP-S 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 IEEE-AP-S 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 IEEE-AP-S 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 Computations-Methods 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. Valero-Nogueira, R.G. Rojas ""Fast solution of EM scattering by large finite array of strips on a grounded dielectric slab"." in 2000 IEEE AP-S 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 AP-S 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 AP-S International Symposium and USNC/URSI National Radio Science Meeting. Salt Lake City, (7 2000).

1999

  • A. Valero-Nogueira and R.G. Rojas ""Efficient Spectral-Based Scheme for Fast matrix-vector 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 AP-S 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 AP-S 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 UTD-based 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 two-part 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 Full-Wave 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 Chiro-Dielectric 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 Full-Wave Analysis of the Power Leakage from Conductor-backed Coplanar Waveguides"." in MTT International Symposium. Albuquerque, (6 1992).
  • R.G. Rojas and M. Otero* ""Scattering by a Chiro-Dielectric 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 two-part 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 Two-and-Three-Part 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 Half-Plane"." 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 Half-Plane 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 Half-Plane (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 Thin-Dielectric Half-Plane"." 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 Half-Plane"." 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).