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My Background

My Background. Undergraduate: Alabama State University, Montgomery Alabama B.S. Mathematics CSC/Minor Cum Laude (2001) University of South Florida, Tampa Florida MSEE, WAMI Program McKnight Doctoral Fellow (2006-2009) UNCF, Northrop Grumman Scholar (2005-2006)

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My Background

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  1. My Background Undergraduate: Alabama State University, Montgomery Alabama B.S. Mathematics CSC/Minor Cum Laude (2001) University of South Florida, Tampa Florida MSEE, WAMI Program McKnight Doctoral Fellow (2006-2009) UNCF, Northrop Grumman Scholar (2005-2006) NSF Bridge to Doctorate Fellow(2004-2008)

  2. Quenton Bonds, M.S./PhD Student Electrical Engineering Advisor: Thomas Weller, PhD. Ultra-Wideband (UWB)Antennas for Wireless Sensory Networks

  3. What is UWBTechnology? • In General • UWB is any technology which sends and receives wireless signals using very small pulses <1nS (Time Domain), whereas the current wireless technology uses continuous wave sinusoidal signals (Frequency Domain). • UWB transmits and receives signals within the 3.1GHz-10.6GHz frequency spectrum. • UWB sends signals with a fractional bandwidth of 500MHz.

  4. Defense Why UWBTechnology? Medical Imaging Outdoors • UWB Technology has the ability to: • Penetrate Surfaces • Resolve harsh multi-path environments • Send data at a very low power • Position • Very high data rate: >500Mbps (very fast) Making UWB technology ideal for sensor networks deployed in any environment

  5. The Objective Design UWB Antennas for wireless sensory networks that could not only be used in the Vieques Islands but other environments prone to signal obstruction GPS Receiver Biological Sensors UWB Technology Vieques Island Jungles UWB Antenna Nanosecond Pulse Nanosecond Pulse UWB Antenna UWB Antenna Nanosecond Pulse UWB Antenna Nanosecond Pulse

  6. The Problem • Electrical devices are getting smaller and smaller, therefore there is a high demand for smaller antennas. • Current antenna technology cannot support high data rates and bandwidth demands. • UWB pulse is affected by the antenna. • Radiation Pattern of antenna changes • as a function of frequency.

  7. Research Methods • Module 1. Research current UWB antenna technology • Module 2. Study the following tradeoffs: • I. Pulse Degradation vs. Antenna Dimensions • II. Frequency vs.. Radiation Pattern • Module 3. Design antennas using CAD software (ADS Momentum and Ansoft HFSS). • Module 4. Find best fabrication method: Etching/Milling/Lithography. • Module 5. Measurements: S11 over frequency, radiation pattern and pulsed transmission testing will be performed. Pulsed transmission testing will utilize the UWB Test Bed now being developed in the USF WAMI Center. Eθ (Theta) Plot EΦ (Phi) Plot Circular UWB Simulations VNA Anechoic Chamber

  8. 6 (GHz) 7 (GHz) 8 (GHz) 10 (GHz) Results • With such a wide bandwidth, 3.6GHz-10.1GHz, we have found that the UWB radiation pattern (RP) changes as a function of frequency. See radiation pattern measurements vs. Frequency below: • Fabrication methods must be very precise to get good measurements. See graph of measured and simulated S11 results:

  9. Future Works • Goal PH.D: Design conformal UWB for broader impact applications. • Noninvasive Medical Sensing • Fabric Antenna Sensors • Monitoring of Vital Signs • Fire and Rescue • Troops • Elderly • Biological Detection Sensors

  10. Acknowledgements Alabama State University NSF grant # HRD – 0217675 NSF FLSAMP Project Dr. Ashanti Pyrtle Dr. Shekhar Bhansali Dr. Thomas Weller

  11. Questions?

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