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Research

Area

  • Ultra-wideband (UWB) antennas 
  • Electrically small antennas
  • Engineering optimizations
  • Novel electromagnetic materials

Technical Skills

  • Electromagnetic theory, antenna design and measurement techniques, engineering optimizations
  • MATLAB, Ansoft’s HFSS, CST Microwave Studio, FEKO, NEC, Agilent’s ADS, Latex
  • Vector network analyzer, spectrum analyzer, anechoic chamber measurement
  • Chinese (native), English (fluent)

Dissertation

        Shape Optimization of Low-Profile UWB Body-of-Revolution Monopole Antennas (pdf)

Projects

  • Design Optimization of Low-Profile UWB Body-of-Revolution Monopole Antennas 

    (Jan, 2010 - Aug, 2011, OSU, advisor: Dr. Dimitris Psychoudakis, Dr. Chi-Chih Chen and Prof. John. L. Volakis)

  • Broadband Characteristics of a Dome-Dipole Antenna

    (Apr, 2009 - Dec, 2009, OSU, advisor: Dr. Chi-Chih Chen, Dr. Dimitris Psychoudakis and Prof. John. L. Volakis)


  • Frequency-Scaled UWB Inverted-Hat Antenna

    (Sep, 2008 - Mar, 2009, OSU, advisor: Dr. Chi-Chih Chen and Prof. John. L. Volakis)

A novel ultrawideband (UWB) antenna referred to as the inverted-hat antenna (IHA) is described. We provide a systematic approach to generate a frequency-scaled IHA structure subject to aperture width and height constraints. An experimental verification is also given. The proposed compact wideband antenna exhibits frequency-independent behavior by introducing a moderate number of appropriately scaled elliptical segments and by controlling the outer surface growth profile. A modified seven-ellipse IHA is demonstrated to provide a 10:1 impedance bandwidth with satisfactory radiation properties. The simulation and measurement results are in reasonably good agreement.



 
  


  • Low-profile ultra-wideband inverted-hat monopole antenna for 50MHz-2GHz operation 

    (Jan, 2008 - Aug, 2008, OSU, advisor: Dr. Chi-Chih Chen and Prof. John. L. Volakis)

    A compact low-profile UWB monopole antenna is proposed to operate from 50 MHz up to 2 GHz. The developed double-ellipse inverted-hat antenna (IHA) is 15 inches in aperture, 6 inches tall, and achieves -15 dBi gain at 75 MHz in the presence of a finite 21 inch diameter ground plane, with the corresponding frequency being 50 MHz for an infinite ground plane. Calculated and measured gain data are given with reasonable agreement. The triple-ellipse IHA is investigated to resolve impedance matching issues at higher frequencies. Gain performance against antenna height and aperture are also studied. The proposed antenna is especially suited for small unmanned aerial vehicles.

 

  • Design and implementation of a control circuit for the 300W three-phase PV grid-connected power system
(Feb, 2007 - Jun, 2007, THU, advisor: Prof. Zhengming Zhao)

The development of photovoltaic (PV) power industry is reviewed, followed by a prediction of promising technology and applications in the future. A control circuit for the 300W three-phase PV grid-connected power system is designed, implemented and tested. Employing Deadbeat PWM strategy, a slightly distorted inverter output current is obtained. The simulated and measured data are in a good agreement. The fabricated prototype has been successfully integrated into the real-time system.

 

Journal Publications

  • Design Optimization of a Low-Profile UWB Body-of-Revolution Monopole Antenna

        J. Zhao, D. Psychoudakis, C.C. Chen and J. L. Volakis
       IEEE Transactions on Antennas and Propagation, to be submitted.

       J. Zhao, Z. Zhao, and D. Zhou
       Electrical Applications, vol. 26, no. 10, pp. 6-10,35, Oct, 2007.
太阳能光伏发电技术现状及其发展
 
赵晶，赵争鸣，周德佳
电气应用，vol. 26, no. 10, pp. 6-10,35, Oct, 2007.
Conference Presentations
 
  • Ultra-wideband Performance Optimization of a Body-of-Revolution Monopole Antenna
    J. Zhao, D. Psychoudakis, C-C. Chen, and J. L. Volakis
    2011 IEEE AP-S International Symposium on Antennas and Propagation, Spokane, WA, July 3-8, 2011

  • Low-profile Ultra-wideband Antennas for Software Defined Radio
    J. Zhao, C-C. Chen, and J. L. Volakis
    2010 IEEE AP-S International Symposium on Antennas and Propagation, Toronto, ON, Canada, July 11-16, 2010

  • Broadband Characteristics of a Dome-Dipole Antenna
    J. Zhao, D. Psychoudakis, C-C. Chen, and J. L. Volakis
    2010 IEEE AP-S International Symposium on Antennas and Propagation, Toronto, ON, Canada, July 11-16, 2010

  • Low Profile Top-Loaded Cone Antenna for VHF to UHF Operation
    J. Zhao, S. E. Amaldoss, D. Psychoudakis, C-C. Chen, and J. L. Volakis
    2010 National Radio Science Meeting, Boulder, CO, January 6-9, 2010

  • Compact 11-ellipse Inverted-Hat Antenna for UWB Operations
    J. Zhao, Shenario Ezhil Valavan A, C-C. Chen, and J. L. Volakis
    31st Annual Antenna Measurement Techniques Association (AMTA)  Symposium, Salt Lake City, UT, November 1-6, 2009 

  • A Novel Low-Profile Frequency-Independent Inverted-Hat Antenna for UWB Applications
    J. Zhao, C-C. Chen, and J. L. Volakis
    2009 IEEE AP-S International Symposium on Antennas and Propagation, Charleston, SC, June 1-5, 2009

 

  • Ultra-wideband Triple-Ellipse Inverted-Hat Antenna for Aircraft Communications
    J. Zhao, C-C. Chen and J. L. Volakis
    ACES 2009 - The 25th  International Review of Progress in Applied Computational Electromagnetics, Monterey, CA, March 8-12, 2009

 

  • Low-profile Inverted-hat Monopole Antenna for UWB Application
    J. Zhao, C-C. Chen, and J. L. Volakis
    2009 National Radio Science Meeting, Boulder, CO, January 5-8, 2009