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  • 1
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    Unknown
    Ab initio (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-09-02
    Description: Author(s): Chang-Kai Li, Feng Wang, Bin Liao, Xiao-Ping OuYang, and Feng-Shou Zhang We present an ab initio study of the electronic stopping power of protons and helium ions in an insulating material, HfO 2 . The calculations are carried out in channeling conditions with different impact parameters by employing Ehrenfest dynamics and real-time, time-dependent density functional theor... [Phys. Rev. B 96, 094301] Published Fri Sep 01, 2017
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Ka-Band Beam Steering Reflectarray Study (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-05
    Description: A one-meter diameter, 32 GHz active microstrip reflectarray capable of electronic beam steering has been studied. The 15_500 element array consists of rnicrostrip patch antennas, microstrip phase shifters, and dc bias lines. Specifically, the study focused on the solid-state devices and dc bias layouts for scanning the beam linearly 45 from boresight using 2-bit phase shifters. Three configurations are recommended for the reflectarray with integrated 2-bit phase shifters where the total substrate and cladding mass varies from 8 kg to 14 kg. Additionally, dc power requirements for p-i-n diodes in 1-bit, 2-bit and 3-bit phase shifting circuits are approximately 19 W, 19 W, and 39 W, respectively. The dc power requirement for phase shifters using passive MESFETs is much less than 1 W.
    Keywords: Communications and Radar
    Type: IEEE Antennas and Propagation Society International Symposium, Volume 3; 1662-1665; IEEE-Catalog-99CH37010-Vol-3
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A Cassegrain Offset-Fed Dual-Band Reflectarray (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An X/Ka dual-band microstrip reflectarray with circular polarization (CP) has been constructed using thin membranes and Cassegrain offset-fed configuration. It is believed that this is the first Cassegrain reflectarray ever been developed. This antenna has a 75-cm-diameter aperture and uses metallic subreflector and angular-rotated annular ring elements. It achieved a measured -3dB-gain bandwidth of 700 MHz at X-band and 1.5 GHz at Ka-band, as well as a CP bandwidth (3dB axial ratio) of more than 700 MHz at X-band and more than 2 GHz at Ka-band. The measured peak efficiencies are 49.8% at X-band and 48.2% at Ka-band.
    Keywords: Communications and Radar
    Type: IEEE Antennas and Propagation Symposium; Jul 09, 2006 - Jul 14, 2006; Albuquerque, NM; United States
    Format: text
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    NASA TECHNICAL REPORTS
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