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  • Other Sources  (5)
  • NASA Technical Reports  (5)
  • Electronics and Electrical Engineering  (3)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (2)
  • 1995-1999  (5)
  • 1950-1954
  • 1
    Publication Date: 2011-08-23
    Description: We have investigated thin films and junctions based on copper indium diselenide (CIS) which have been grown by electrochemical deposition. CIS is a leading candidate for use in polycrystalline thin film photovoltaic solar cells. Electrodeposition is a cost-effective method for producing thin-film CIS. We have produced both p and n type CIS thin films from the same aqueous solution by simply varying the deposition potential. A CIS pn junction was deposited using a step-function potential. Stoichiometry of the single layer films was determined by energy dispersive spectroscopy. Carrier densities of these films increased with deviation from stoichiometry, as determined by the capacitance versus voltage dependence of Schottky contacts. Optical bandgaps for the single layer films as determined by transmission spectroscopy were also found to increase with deviation from stoichiometry. Rectifying current versus voltage characteristics were demonstrated for the Schottky barriers and for the pn junction.
    Keywords: Electronics and Electrical Engineering
    Type: Materials Research Society Symposium Proceedings: Chemical Aspects of Electronic Ceramics Processing; Volume 495; 383-388
    Format: text
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  • 2
    Publication Date: 2018-06-02
    Description: A microstrip patch antenna fed by a coaxial probe and reactively loaded by a open circuited microstrip line has been used previously to produce circular polarization[ l] and also as a building block for a series fed microstrip patch array [2]. Rectangular and circular patch antennas loaded with a microstrip stub were previously analyzed using the generalized Thevenin theorem [2,3]. In the Thevenin theorem approach, the mutual coupling between the patch current and the surface current on the stub was not taken into account. Also, the Thevenin theorem approach neglects continuity of current at the patch-stub junction. The approach in this present paper includes the coupling between the patch and stub currents as well as continuity at the patch-stub junction.
    Keywords: Electronics and Electrical Engineering
    Type: IEEE Antennas and Propagation Society International Symposium 1997. Volume 2: Digest; 610-613; IEEE-Catalog-97CH36122-Vol-2
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: Proposed method of obtaining approximately desired radiation or reception pattern from antenna that includes reflector based on concept of superposition of electromagnetic fields generated by multiple feedhorns or feed antenna elements arrayed at various positions near reflector and excited at electronically adjustable magnitudes and phases. In intended application, reflector nominally paraboloidal, feed elements N feedhorns in hexagonal array, and method used to compensate for deviations of real reflector surface from nominal paraboloidal shape. Method and concept also applicable to electronic beam steering and electronic antenna compensation in other situations.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-14461 , NASA Tech Briefs (ISSN 0145-319X); 19; 1; P. 32
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  • 4
    Publication Date: 2019-07-13
    Description: The increasing complexity of space solar cells and the increasing international markets for both cells and arrays has resulted in workshops jointly sponsored by NASDA, ESA and NASA. These workshops are designed to obtain international agreement on standardized values for the AMO spectrum and constant, recommend laboratory measurement practices and establish a set of protocols for international comparison of laboratory measurements. A working draft of an ISO standard, WDI 5387, 'Requirements for Measurement and Calibration Procedures for Space Solar Cells' was discussed with a focus on the scope of the document, a definition of primary standard cell, and required error analysis for all measurement techniques. Working groups addressed the issues of Air Mass Zero (AMO) solar constant and spectrum, laboratory measurement techniques, and the international round robin methodology. A summary is presented of the current state of each area and the formulation of the ISO document.
    Keywords: Electronics and Electrical Engineering
    Type: NASA-TM-113155 , NAS 1.15:113155 , E-10905 , IECEC-97534 , Intersociety Energy Conversion Engineering Conference; Jul 27, 1997 - Aug 01, 1997; Honolulu, HI; United States
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  • 5
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) computer program developed to calculate electromagnetic interactions among elements of antenna arrays with circular apertures with specified distributions of electromagnetic fields in apertures. Distributions assumed superpositions of electromagnetic modes existing in circular waveguide. Various external media included to provide flexibility of use; for example, flexibility to determine effects of dielectric covers upon impedances of aperture-type antennas. Written in VAX FORTRAN for DEC VAX-series computers running VMS (LAR-15236) and IBM PC-series and compatible computers running MS-DOS (LAR-15226).
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-15226 , LAR-15236 , NASA Tech Briefs (ISSN 0145-319X); 19; 4; P. 62
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