You are here

Niru Nahar

  • Research Assistant Professor, Electrical & Computer Engr.
  • Room #263
    1330 Kinnear Rd
    Columbus, OH 43212
  • 614-292-1588

About

Education

Ph.D., 2008, The Ohio State University

Areas of interest

Dr. Nahar's current Optical Engineering research interests include combined RF & Optical sensing, THZ sensing and imaging, photonic crystal fibers, free-space optics, optical true time delay engine, and antenna array beam steering. Her Optometry and Vision Science research interests include objective measures of eyestrain and progressive additional lenses.

Office

175 ElectroScience Laboratory

 

 

Honors

  • August, 2018-
    August, 2018

    1st place in Student Paper Competition: Shubhendu Bhardwaj, Niru K. Nahar and John L. Volakis, “Novel Circularly Polarized Horn Antennas and Phase-less Characterization methods for sub-mm-Wave and Terahertz Communication and Sensing”. Alabama Southern Community College.

  • April, 2018

    3rd place in Krauss Memorial ECE student poster competition: U. Chipengo, N. K. Nahar and J. L. Volakis, Novel Concepts for Slow Wave Structures Used in High Power Backward Wave Oscillators.

  • December, 2017

    ElectroScience Laboratory Annual Best Journal Article Award Runner-Up: Woon-Gi Yeo, Ogan Gurel, Nandhini Srinivasan, Paul D. King, Niru K. Nahar, Sungchan Park, Norman L. Lehman and Kubilay Sertel, “THz Imaging and Electromagnetic Model of Axon Demyelination in Alzheimer’s Disease”.

  • July, 2017-
    July, 2017

    3rd place in Student Paper Competition: Nandhini Srinivasan, Cosan Caglayan, Niru K. Nahar, Kubilay Sertel, “High-resolution Polarimetric THz Imaging for Biomedical Applications”.

  • March, 2017

    1st place in student engineering competition: U. Chipengo, N. K. Nahar and J. L. Volakis, Novel Concepts for Slow Wave Structures Used in High Power Backward Wave Oscillators.

  • November, 2016

    2nd place, IEEE-AP/MTT Columbus Chapter Graduate Student Poster Competition.

  • September, 2016

    Student Shubhendu Bhardwaj received Louise B. Vetter Award.

  • August, 2016

    Electred Member of USNC-URSI Commission B.

  • June, 2016

    3rd Best Student Paper Award, IEEE International Symposium on Antennas and Propagation.

  • June, 2016

    OSA Senior Member.

  • May, 2016

    Student Shubhendu Bhardwaj received Presidential Fellowship.

  • March, 2016

    Finalist in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • March, 2016

    Honorable Mention in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • October, 2015

    1st place in Student Paper Competition, 37th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium.

  • March, 2015

    Lumley Research Award from College of Engineering.

  • October, 2014

    2nd place in Student Paper Competition, 36th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium.

  • July, 2014

    Honorable Mention in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • October, 2013

    Senior Member.

  • August, 2006

    Alumni Grants for Graduate Research and Scholarship.

  • May, 1997

    Appreciation Awards for Quality Control.

  • February, 1997

    Appreciation Awards for Quality Control.

Books

2009

  • 2009. "Free Space Optical True Time Delay for Beam Steering: Design, Simulation and Characterizations." M Verlag.

Chapters

2018

  • 2018. "Dispersion Engineering for Slow Wave Structure Design." In High Power Microwave Sources and Technologies Using Metamaterials, edited by E. Schamiloglu,,

Journal Articles

2019

  • Yeo, W-G.; Gurel, O.; Hitchcock, C.L.; Park, S. et al., 2019, "Evaluation of cancer tissue morphology via THz spectroscopic imaging: Human lung and small intestine malignancies." INFRARED PHYSICS & TECHNOLOGY 97, 411-416 - 411-416.
  • Sahin, S.; Nahar, N.K.; Sertel, K., 2019, "Thin-Film SUEX as an Antireflection Coating for mmW and THz Applications." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 9, no. 4, 417-421 - 417-421.

2018

  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2018, "A Study of Velocity-Tapered Slow Wave Structures for High-Efficiency Backward Wave Oscillators." IEEE TRANSACTIONS ON ELECTRON DEVICES 65, no. 7, 3054-3060 - 3054-3060.
  • Sanphuang, V.; Nahar, N.K., 2018, "Flexible terahertz and FarIR polymer-supported filter." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 60, no. 11, 2801-2805 - 2801-2805.
  • Sahin, S.; Nahar, N.K.; Sertel, K., 2018, "Permittivity and Loss Characterization of SUEX Epoxy Films for mmW and THz Applications." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 8, no. 4, 397-402 - 397-402.

2017

  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2017, "Backward-Wave Oscillator Operating in Low Magnetic Fields Using a Hybrid-TE11 Mode." IEEE TRANSACTIONS ON ELECTRON DEVICES 64, no. 9, 3863-3869 - 3863-3869.
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2017, "THz spatial filter employing bimaterial switching for temperature sensing." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 59, no. 1, 168-171 - 168-171.
  • Yeo, W-G.; Gurel, O.; Srinivasan, N.; King, P.D. et al., 2017, "Terahertz Imaging and Electromagnetic Model of Axon Demyelination in Alzheimer's Disease." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 7, no. 6, 711-721 - 711-721.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2017, "A Cost-Effective Phaseless Pattern Measurement Method for a CP Antenna in a Submillimeter-Wave Band." IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 16, 1683-1686 - 1683-1686.
  • Bhardwaj, S.; Nahar, N.; Rajan, S.; Volakis, J., 2017, "Numerical Analysis of Terahertz Emission from an Asymmetrically Biased un-gated HEMT." IEEE transactions on Electron Devices 63, no. 3, 990-996 - 990-996.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2017, "ALL ELECTRONIC PROPAGATION LOSS MEASUREMENT AND LINK BUDGET ANALYSIS FOR 350 GHz COMMUNICATION LINK." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 59, no. 2, 415-423 - 415-423.

2016

  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2016, "Cold Test Validation of Novel Slow Wave Structure for High-Power Backward-Wave Oscillators." IEEE TRANSACTIONS ON PLASMA SCIENCE 44, no. 6, 911-917 - 911-917.
  • Bhardwaj, S.; Nahar, N.K.; Rajan, S.; Volakis, J.L., 2016, "Numerical Analysis of Terahertz Emissions From an Ungated HEMT Using Full-Wave Hydrodynamic Model." IEEE Transactions on Electron Devices 63, no. 3, 990-996 - 990-996.
  • Zuboraj, M.; Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2016, "Experimental Validation of Slow-Wave Phenomena in Curved Ring-Bar Slow-Wave Structure." IEEE TRANSACTIONS ON PLASMA SCIENCE 44, no. 9, 1794-1799 - 1794-1799.
  • Varittha Sanphuang, Nima Ghalichechian, Niru K. Nahar and John L. Volakis,, 2016, "Reconfigurable THz Filters Using Phase-Change Material and Integrated Heater." IEEE Transactions on THz Science and Technology 6, no. 4, 583-591 - 583-591.

2015

  • S. Bhardwaj, N. K. Nahar, and J.L. Volakis, 2015, "Novel Phaseless Gain Characterization for Circularly Polarized Antennas at mm-wave and THz Frequencies." IEEE Trans. Antennas Propagat. 63, no. 10, 4263-4270 - 4263-4270.
  • Sanphuang, V.; Yeo, W-G.; Volakis, J.; Nahar, N.K., 2015, "THz Transparent Metamaterials for Enhanced Spectroscopic and Imaging Measurements." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 5, no. 1, 117-123 - 117-123.
  • Yeo, W-G.; Nahar, N.K., 2015, "Characterization of a THz CW spectrometer pumped at 1550 nm." INFRARED PHYSICS & TECHNOLOGY 71, 70-76 - 70-76.
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L., 2015, "Equivalent circuit for VO2 phase change material film in reconfigurable frequency selective surfaces." APPLIED PHYSICS LETTERS 107, no. 25,
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2015, "Radial line slot array antenna with vertical waveguide feed for F-band communication." IET MICROWAVES ANTENNAS & PROPAGATION 9, no. 3, 193-199 - 193-199.
  • Chipengo, U.; Zuboraj, M.; Nahar, N.K.; Volakis, J.L., 2015, "A Novel Slow-Wave Structure for High-Power K-a-Band Backward Wave Oscillators With Mode Control." IEEE TRANSACTIONS ON PLASMA SCIENCE 43, no. 6, 1879-1886 - 1879-1886.
  • Tenneti, S.N.; Nahar, N.K.; Volakis, J.L., 2015, "Full-wave modeling of THz RTD-gated GaN HEMTs." INFRARED PHYSICS & TECHNOLOGY 72, 221-228 - 221-228.
  • 2015, "Equivalent circuit for VO2 phase change material film in reconfigurable frequency selective surfaces." APPLIED PHYSICS LETTERS 107, no. 25,

2014

  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2014, "FREQUENCY SELECTIVE SURFACES FILTERS TO ENHANCE PERFORMANCE OF KA BAND APPLICATIONS." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 56, no. 3, 563-568 - 563-568.

2013

  • Tenneti, S.; Nahar, N.K.; Volakis, J.L., 2013, "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1136-1137 - 1136-1137.
  • Yeo,Woon-Gi; Nahar,Niru,K; Sertel,Kubilay, 2013, "Far-IR multiband dual-polarization perfect absorber for wide incident angles." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 55, no. 3, 632-636 - 632-636.
  • Yeo, W-G.; Nahar, N.K.; Sertel, K., 2013, "Far-IR multiband dual-polarization perfect absorber for wide incident angles." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 55, no. 3, 632-636 - 632-636.

2012

  • 2012, "Broadband radio frequency conductivity measurement technique for engineered composites." IET MICROWAVES ANTENNAS & PROPAGATION 6, no. 4,
  • Gowrisankaran, S.; Nahar, N.K.; Hayes, J.R.; Sheedy, J.E., 2012, "Asthenopia and Blink Rate Under Visual and Cognitive Loads." OPTOMETRY AND VISION SCIENCE 89, no. 1, 97-104 - 97-104.
  • Chung, J-Y.; Nahar, N.K.; Zhang, L.; Bayram, Y. et al., 2012, "Broadband radio frequency conductivity measurement technique for engineered composites." IET MICROWAVES ANTENNAS & PROPAGATION 6, no. 4, 371-376 - 371-376.

2011

  • Nahar, N.K.; Chung, J-Y.; Tzanidis, I.; Sertel, K. et al., 2011, "OPTICALLY TRANSPARENT RF-EO APERTURE WITH 20:1 BANDWIDTH." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 53, no. 8, 1863-1866 - 1863-1866.
  • Nahar, N.K.; Raines, B.; Rojas, R.G.; Strojny, B., 2011, "Wideband antenna array beam steering with free-space optical true-time delay engine." IET MICROWAVES ANTENNAS & PROPAGATION 5, no. 6, 740-746 - 740-746.
  • Nahar, N.K.; Rojas, R.G., 2011, "Efficient Free-Space Coupling to LMA-PCF by Aberration Correction." IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 1, no. 10, 1553-1557 - 1553-1557.
  • Nahar, N.K.; Gowrisankaran, S.; Hayes, J.R.; Sheedy, J.E., 2011, "Interactions of visual and cognitive stress." OPTOMETRY-JOURNAL OF THE AMERICAN OPTOMETRIC ASSOCIATION 82, no. 11, 689-696 - 689-696.
  • 2011, "OPTICALLY TRANSPARENT RF-EO APERTURE WITH 20:1 BANDWIDTH." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 53, no. 8,

2009

  • Nahar, N.K.; Rojas, R.G., 2009, "Low-loss polynomial White cell optical true-time delay engine for wideband radio frequency array beam steering." APPLIED OPTICS 48, no. 20, 3921-3929 - 3921-3929.

2008

  • Nahar, N.K.; Rojas, R.G., 2008, "Coupling Loss From Free Space to Large Mode Area Photonic Crystal Fibers." JOURNAL OF LIGHTWAVE TECHNOLOGY 26, no. 21-24, 3669-3676 - 3669-3676.
  • 2008, "Coupling Loss From Free Space to Large Mode Area Photonic Crystal Fibers." JOURNAL OF LIGHTWAVE TECHNOLOGY 26, no. 21-24,

2007

  • Nahar, N.K.; Sheedy, J.E.; Hayes, J.; Tai, Y-C., 2007, "Objective measurements of lower-level visual stress." OPTOMETRY AND VISION SCIENCE 84, no. 7, 620-629 - 620-629.

2003

  • Higgins, R.; Nahar, N.K.; Anderson, B.L., 2003, "Design and demonstration of a switching engine for a binary true-time-delay device that uses a White cell." APPLIED OPTICS 42, no. 23, 4747-4757 - 4747-4757.

Unknown

  • "THz Pulsed Imaging for Cancer Assessment on Human Lung and Small Intestine Tissues." Physics in Medicine and Biology
  • "THz Spectroscopic Response and Imaging for Human Brain Tissue with Alzheimer's disease." IEEE Transactions on Terahertz Science and Technology
  • Nahar, N.K., "Tightly Coupled Ka-Band Dipole Array Antenna with Integrated MEMS Phase Shifters." IEEE Transactions on Antennas and Propagation
  • Saqueb An Nazmus, S.; Nahar, N.K.; Sertel, K., "THz Imaging Using Rail-based Synthetic Aperture Radar for the Detection of Concealed Objects." Journal of Infrared, Millimeter, and Terahertz Waves

Presentations

  • "New frontiers for commercial applications of terahertz."
  • "Concentric Arrayed Radial Line slot Array Antenna for W-band, Optimized Using Particle Swarm Optimization." 2013, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting July, 2013,
  • "Phase-Change Materials for Reconfigurable Terahertz Microsystems." 2014, Presented at 2014 OSU Materials Week,
  • "Photonics & THz Research Activities at ElectroScience Laboratory." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting, 2011,
  • "Relationship between vision stress and generalized body stress." 2009, Presented at Computer Display and Vision Conference, Forest Grove, OR,
  • "Beam Steering of Phased Array Antenna with Quadratic White Cell Optical True Time Delay Engine." 2006, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, OSU, Columbus, OH,
  • "RF Array Beam Steering with Free-Space Optical True-Time Delay Engine." 2010, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus, OH, August, 2010,
  • "Eliminating Aberration in White Cell." 2001, Presented at Great Lakes Optics Symposium,
  • "Micro-Structured Fibers as Delay Elements for Binary Cell." 2004, Presented at DARPA/Northrop Grumman Electronic Systems Project Review,
  • "Microsoft Corporation, Advanced Reading Technologies Group, Project Review." 2006, Presented at Microsoft Corporation, Advanced Reading Technologies Group,
  • "State of Research at ElectroScience Laboratory." 2012, Presented at Battelle Memorial Institute,
  • "Non-Paraxial Lens Design Systems for White Cell True Time Delay Engine." 2002, Presented at DARPA/Northrop Grumman Electronic Systems Project Review,
  • "RF and Optics Research at ElectroScience Laboratory." 2009, Presented at University of Dayton,
  • "Multispectral Sensing & Imaging: Integrated RF, THz and Optical Apertures." 2011, Presented at ElectroScience Laboratory,
  • "Conformal RF-EO Systems." 2014, Presented at AFRL, Project Kick-off meeting,
  • "A Design Analysis of IR Transparent Ka Band Pass Filters Using FSS." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting,
  • "Cost-Effective, Simple and Accurate CP Gain Measurement Method for sub-mm-wave and Terahertz Frequencies." 2016, Presented at CERF-ESL,
  • "A Novel Slow Wave Structure for mm-Wave Traveling Wave Tubes." 2016, Presented at CERF-ESL,
  • "Novel Concepts for Slow Wave Structures used in High Power Backward Wave Oscillators." 2016, Presented at CERF-ESL,
  • "Broadband FarIR Polymer-supported Filter." 2016, Presented at CERF-ESL,
  • "THz Biosensor employing Phase-Change Materials." 2016, Presented at CERF-ESL,
  • "Novel Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." 2014, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting July, 2014,
  • "New Frontiers for Commercial Application of Terahertz." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting,
  • "Ultra Wideband Transparent RF Aperture for Electro Optical Integration." 2010, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus, OH, 2010,
  • "Novel Phaseless Gain Characterization for Circularly Polarized Antennas at mm-Wave and THz Frequencies."
  • "Ultra Wideband Transparent RF Aperture for Electro-Optical Integration." Presented at 2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting,

Papers in Proceedings

2019

  • Sahin, S.; Nahar, N.K.; Sertel, K. "Anti-reflective SUEX Coatings of Silicon Optics for mmW and THz Applications." in IEEE USNC-URSI NRSM, Boulder, CO. (1 2019).
  • Paul, B.; Nahar, N.; Sertel, K. "True-time Delay Engine Harnessing the Frozen-mode in Coupled Silicon Ridge Waveguides." in IEEE- NAECON. (7 2019).
  • Nahar, N.K.; Newton, L. "Equivalent Circuit Model for Reconfigurable Far-Infrared Filter Employing Vanadium Dioxide." in IEEE APS/URSI, Atlanta, GA. (7 2019).
  • Ozbay, B.; Arage, A.; Cabigao, J.; Velasquez, C. et al. "Mitigation of Mutual-coupling Effects in Millimeter-wave Automotive Radars." in IEEE APS/URSI, Atlanta, GA. (7 2019).
  • Hossain, M.; Saqueb, S.; Arage, A.; Cabigao, J. et al. "Wideband, Wide Angle Radome Design for mm-Wave Automotive Radar Systems." in IEEE APS/URSI, Atlanta, GA. (7 2019).
  • Hossain, M.; Nahar, N.K.; Sertel, K. "Morphological Feature Extraction in Biomedical Samples using Polarimetric Terahertz Imaging." in IEEE APS/URSI, Atlanta, GA. (7 2019).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "Non-Contact Characterization of Antenna Parameters via One-Port Open-Fixture Network Calibration." (6 2019).

2018

  • Sahin, S.; Nahar, N.K.; Sertel, K. "Performance Characterization of Monolithically Integrated mmW Phased Arrays." in IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting. (7 2018).
  • Kula, J.; Nahar, N.K.; Volakis, J.L. "Reconfigurable Band Rejection and Band-Pass Frequency Selective Structures." in IEEE APS/URSI 2018. (7 2018).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "Millimeter-wave and Terahertz Properties of SUEX, a Thick, Dry Resist Alternative to Epoxy-based SU-8." in IEEE APS/URSI. (7 2018).
  • Nahar, N.K.; Sahin, S. "Performance Characterization of Monolithically Integrated mmW Phased Arrays." in IEEE APS/URSI 2018. (7 2018).
  • Gurel, O.; Yeo, W-G.; Srinivasan, N.; King, P.D. et al. "Terahertz Imaging and Electromagnetic Model of Axon Demyelination in Alzheimer’s Disease." in International Conference on Neurovascular and Neurodegenerative Diseases. (10 2018).
  • Saqueb, S.A.N.; Garry, J.L.; Smith, G.E.; Nahar, N.K. et al. "THz Imaging Using Rail-based Synthetic Aperture Radar for the Detection of Concealed Objects." in IEEE-Antennas-and-Propagation-Society International Symposium on Antennas and Propagation / USNC/URSI National Radio Science Meeting. (1 2018).
  • Newton, L.; Sanphuang, V.; Nahar, N.K. "Reconfigurable Multiband FarIR Notch Filter Employing Phase Change Material." in IEEE-Antennas-and-Propagation-Society International Symposium on Antennas and Propagation / USNC/URSI National Radio Science Meeting. (1 2018).

2017

  • Chepengo, U.; nahar, N.K.; Volakis, J.L. "Novel Concepts for Slow Wave Structures used in High Power Backward Wave Oscillators." in 19th Annual Directed Energy Symposium. (2 2017).
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L. "Significant Efficiency Enhancements in High Power Backward Wave Oscillators using Inhomogeneous Slow Wave Structures." in International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting. (1 2017).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Novel Circularly Polarized Horn Antennas and Phase-less Characterization methods for sub-mm-Wave and Terahertz Communication and Sensing." in 32nd International Union of Radio Science General Assembly & Scientific Symposium. (8 2017).
  • Sahin, S.; Caglayan, C.; Nahar, N.; Sertel, K. "MONOLITHIC REALIZATION AND CHARACTERIZATION OF ON-CHIP UWB PHASED ARRAYS FOR MMW AND THZ CONNECTIVITY." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2017).
  • Chipengo, U.; Nahar, N.; Volakis, J.L. "EXPERIMENTAL DEMONSTRATION OF HIGHER ORDER DISPERSION IN INHOMOGENEOUS SLOW WAVE STRUCTURES FOR BACKWARD WAVE OSCILLATORS." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2017).
  • Abumunshar, A.J.; Nahar, N.K.; Hyman, D.; Sertel, K. "18-40GHz Low-profile Phased Array with Integrated MEMS Phase Shifters." in 11th European Conference on Antennas and Propagation (EUCAP). (1 2017).

2016

  • Abumunshar, A.; Nahar, N.K.; Hyman, D.; Sertel, K. "18-40GHz Phased Array Antenna using Printed Circuit Board Fabrication and Surface-mount MEMS Phase Shifters." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L. "Cold Test of Homogeneous and Inhomogeneous Slow Wave Structures for High Power Backward Wave Oscillators." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Phase-less Measurement Methods of CP Antennas in sub-mm-wave and THz bands." in 10th European Conference on Antennas and Propagation (EuCAP). (1 2016).
  • Abumunshar, A.J.; Nahar, N.K.; Sertel, K.; Hyman, D.J. "K-to-Ka Band Low-profile Phased Array with Integrated MEMS Phase Shifters." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "A Phaseless Gain and Pattern Characterization of CP Antennas in Sub-mm-wave and Terahertz Bands." in IEEE Conference on Antenna Measurements and Applications (CAMA). (1 2016).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "On-chip UWB Phased Arrays for mmW Connectivity." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Biosensor employing Phase-Change Materials." in IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON 2016). (7 2016).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Spatial Filter Integrating Bimaterial Switching for Sensors." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "Accurate Low Cost Phaseless Measurement Method of CP Antennas at Millimeter Wave and Terahertz Bands." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "Monolithic UWB Phased Arrays for mmW and THz Applications." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "Thermally-Controlled THz Biosensor employing Phase-Change Materials." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • Gurel, O.; McKaya, R.; Jeong, S-H.; Park, J. et al. "Protein Electrodynamics & Terahertz Medicine: An Update." in 7th International THz-Bio Workshop 2016. (6 2016).
  • "K-to-Ka Band Low-profile Phased Array with Integrated MEMS Phase Shifters." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "A Novel Slow Wave Structure for V-band Traveling Wave Tube." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L. "Fabrication and Cold Testing of S Band Inhomogeneous Slow Wave Structure for Highly Efficient Backward Wave Oscillator." in 18th Annual Directed Energy Symposium. (3 2016).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Spatial Filter with Bimaterial Switching." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • Sanphuang, V.; Ghalichecian, N.; Nahar, N.; Volakis, J.L. "Reconfigurable THz Array Employing Vanadium Dioxide." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).

2015

  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting. (1 2015).
  • Sahin, S.; Ghalichechian, N.; Nahar, N.K.; Sertel, K. "Lithographically-fabricated Ultrawideband Phased-Arrays for Agile mmW Connectivity." in USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) Proceedings. (1 2015).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "Propagation Loss Measurement in 300-350 GHz Band Communication Link." in 37th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium. (10 2015).
  • "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting. (1 2015).
  • Abumunshar, A.; Yeo, W-G.; Nahar, N.; Hyman, D. et al. "15-40GHz Tightly-Coupled Dipole Array with Integrated MEMS Phase Shifter." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • Gurel, O.; Yeo, W-G.; Nahar, N.K.; Lehman, N. et al. "THz Spectroscopic Response of Brain Tissue Exhibiting Alzheimer’s Disease." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • Sahin, S.; Ghalichechian, N.; Nahar, N.; Sertel, K. "Lithographically-fabricated Ultrawideband Phased-Arrays for Agile mmW Connectivity." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.; Volakis, J. "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation. (7 2015).

2014

  • Abumunshar, A.J.; Yeo, W-G.; Nahar, N.K.; Hyman, D.J. et al. "Tightly Coupled Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Numerical Modeling of Plasma Oscillations in 2D Electron Gas for THz HEMT Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L. "Modeling of RTD-gated GaN HEMTs at Terahertz frequencies using a full-wave simulation toolset coupled with particle-based equations." (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Phase-Change Material for Reconfigurability in THz Band." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L. "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Analysis and Design of High Electron Mobility Transistors for THz Signal Generation." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Reconfigurable THz Filters with Integrated Micro-Heater." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • Yeo, W-G.; Gurel, O.; Nahar, N.K.; Hitchcock, C.L. et al. "THz Imaging of Alzheimer's Disease: Spectroscopic Differentiation between Normal and Diseased Tissues." in 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Phase Change Materials for Reconfigurable Systems." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Yeo, W-G.; Nahar, N.K.; Hitchcock, C.L.; Park, S. et al. "THz Spectroscopy and Imaging of Major Human Organ Tissues for Cancer Margin Assessment." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Zuboraj, M.; Nahar, N.K.; Volakis, J.L. "A S-BAND HIGH POWER TRAVELING WAVE TUBE FOR RADAR APPLICATION." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "A method of phase-less measurements for the circularly polarized gain in the sub-millimeter band." (1 2014).
  • "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Terahertz-frequency Biomedical Imaging for Wound Management." in 6th Annaul Translation to Clinical (T2C) Regenerative Medicine Wound Care Conference. (3 2014).
  • Tenneti, S.N.; nahar, N.K.; Volakis, J.L. "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "A Method of Phase-less Measurements for the Circularly Polarized Gain in the Sub-Millimeter Band." in Radio Science Meeting (USNC-URSI NRSM), 2014. (1 2014).
  • "Analysis and Design of High Electron Mobility Transistors for THz Signal Generation." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • "High power microwave slow wave structure for relativistic beams." in Radio Science Meeting (USNC-URSI NRSM), 2014 United States National Committee of URSI National. (1 2014).
  • "Modeling of RTD-Gated GaN HEMTs at Terahertz Frequencies Using a Full-Wave Simulation Toolset Coupled with Particle-Based Equations." in Radio Science Meeting (USNC-URSI NRSM). (1 2014).
  • "Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • "Numerical Modeling of Plasma Oscillations in 2D Electron Gas for THz HEMT Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • "Phase Change Materials for Reconfigurability in THz Systems." in IEEE NAECON. (6 2014).
  • Abumunshar, A.; Yeo, W-G.; Nahar, N.; Sertel, K. "Tightly Coupled Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE NAECON. (6 2014).
  • Yeo, W-G.; Gurel, O.; Nahar, N.K.; Hitchcock, C.L. et al. "THz Imaging of Alzheimer’s Disease: Spectroscopic Differentiation Between Normal and Diseased Tissues." in The 39th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). (9 2014).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "Novel Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." in 36th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium. (10 2014).
  • Yeo, W-G.; Nahar, N.K.; Hitchcock, C.L.; Park, S. et al. "THz Spectroscopy and Imaging of Major Human Organ Tissues for Cancer Margin Assessment." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Reconfigurable THz Filters with Integrated Micro-Heater." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Phase Change Materials for Reconfigurability in THz Systems." in IEEE NAECON. (6 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.; Volakis, J. "Phase Change Materials for Reconfigurable Systems." in IEEE International Symposium on Antennas and Propagation. (7 2014).

2013

  • "Link Budget Analysis for 350 GHz Communication Link." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • "Real-time THz Imaging of Human Tissue Characteristics and Cancer Margins." in The 38th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). (9 2013).
  • Tenneti, S.; Nahar, N.; Volakis, J.L. "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." in IEEE International Symposium on Antennas and Propagation. (7 2013).
  • Yeo, W-G.; Trichopoulos, G.; Nahar, N.; Sertel, K. "Real-time Focal Plane Array THz Camera for Bio-Medical Imaging." in 4th International THz-Bio Workshop. (2 2013).
  • "MEMS Tunable THz Filters for Sensing." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Phased Array Antenna with Integrated MEMS Phase Shifters for Ka-Band SATCOM." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • Yeo, W-G.; Nahar, N.K.; Hitchcock, C.L.; Park, S. et al. "Real-time THz Imaging of Human Tissue Characteristics and Cancer Margins." in 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). (1 2013).
  • "Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "MEMS Tunable THz Filters for Sensing." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "A Concentric-Arrayed Radial Line Slot Array Antenna for THz Applications Optimized Using PSO Algorithm." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "A Concentric-Arrayed Radial Line Slot Array Antenna for THz Applications Optimized Using PSO Algorithm." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).

2012

  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "Novel FSS filters in Ka band." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "Broadband THz Filters for THz Sensing Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • Sanphuang,Varittha; Nahar,Niru,K; Volakis,John,L "Broadband THz Filters for THz Sensing Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Broadband THz Filters for THz Sensing Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Increased Output Power 300 GHz Oscillator Based on Linear Superposition." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Novel FSS filters in Ka band." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "Terahertz Characterization of Biological Tissues." in USNC- URSI. (1 2012).
  • "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in International Conference on Electromagnetics in Advanced Applications (ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment and Interference Symposium (EEIS). (1 2012).
  • "Validation of CW THz Spectral Measurements." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • Yeo, W-G.; Nahar, N.K.; Volakis, J.L. "Validation of CW THz Spectral Measurements." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in Electromagnetics in Advanced Applications (ICEAA), 2012 International Conference on. (9 2012).
  • Yeo, W-G.; Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in International Conference on Electromagnetics in Advanced Applications (ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment and Interference Symposium (EEIS). (1 2012).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Dual-Band, Wide-Incident-Angle Absorber for Far-IR and THz Frequencies." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L. "Increased Output Power 300 GHz Oscillator Based on Linear Superposition." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Coating Designs for Tri-Mode Seeker Domes and Multimode Apertures." in 14th DoD Electromagnetic Windows Symposium, San Antonio, TX. (5 2012).

2011

  • "A Far Infrared Narrowband Detector using Frequency Selective Surfaces." in IEEE, APS/URSI Conference. (7 2011).
  • Yeo, W.G.; nahar, N.K.; Lee, R.; Volakis, J.L. "New Frontiers for Commercial Applications of Terahertz." in IEEE National Aerospace & Electronics Conference. (6 2011).

2010

  • "Ultra Wideband Transparent RF Aperture for Electro-Optical Integration." in 2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting. (1 2010).

2009

  • "A Practical Approach to Beam Steering with White Cell True-Time Delay Engine." in IEEE, APS/URSI Conference. (6 2009).
  • "Blinking and squinting when reading: trade-off between cognitive and visual stress." in Computer Display and Vision Conference. (6 2009).

2007

  • "Beam Steering of Four Element RF Phased Array Antenna with White Cell Optical True Time Delay Engine." in Electromagnetic (EM) Range Consortium Annual Meeting. (8 2007).
  • "Eyelid Squint Response to Visual and Cognitive Stress." in Academy 2007. (10 2007).
  • "Visual and cognitive stress determines severity of near work induced asthenopia." in Academy 2007. (10 2007).

2006

  • "Electromyography as an Objective measure of Visual Stress." in Academy 2006. (12 2006).

2005

  • nahar, N.K.; Rojas, R.G. "Free space coupling properties of large mode area Photonic Crystal Fibers." in IEEE, APS/URSI Conference. (7 2005).

2003

  • Anderson, B.L.; Collins, S.A.; Mital, R.; Nahar, N.K. et al. "The Octic White Cell True Time Delay Device." in Government Microcircuit applications and critical technology conference. (4 2003).