• Direction of Arrival Estimation Improvement for Closely Spaced Electrically Small Antenna Array

      Xin, Hao; Yu, Xiaoju; University of Arizona (International Foundation for Telemetering, 2013-10)
      In this paper, a new technique utilizing a scatterer of high dielectric constant in between electrically small antennas to achieve good Direction of arrival (DOA) estimation performance is demonstrated. The phase information of the received signal at the antennas is utilized for direction estimation. The impact of the property of the scatterer on the directional sensitivity and the output signal to noise ratio (SNR) level are studied. Finally the DOA estimation accuracy is analyzed with the proposed technique under the consumption of white Gaussian noise environment.
    • Near Field Wireless Power Transmission

      Xin, Hao; Marcellin, Michael; Sanders, Ivar; Althawab, Meshal; Eberhard, Jared; Hernandez, Alan; Manos, John; Patel, Aniket; Tavour, Alex; von Oppenfeld, Christian; et al. (International Foundation for Telemetering, 2013-10)
      A prototype wireless power transfer system using the near field to transfer energy between resonantly tuned coils, in order to charge a cell phone or other small electronic device. The system uses resonance to ensure maximum wireless power transfer efficiency between the two coils, and gain greater flexibility in distance between the two coils. The frequency of power transfer is in the unregulated 6.78MHz ISM band. The system is monitored and controlled by an Arduino, and shuts off power when the system does not detect a load.