Other Availability: NTIS HC A20/MF AOI •Journal Announcement: STAR8513 GaAlAs-GaAs solar cells were fabricated by liquid phase epitaxy in a process using supercooled melts. Epitaxial layers with smooth surfaces are produced. Layer uniformity improvements give reproducible results in the fabrication of BaAs devices. The cells utilize thin GaAlAs window layers. In order to better understand the electrical characteristics of the cells, the 2 KT direct current in GaAs diodes was analyzed, studying its dependence on surface area and perimeter value. The? photovoltaic samples efficiency is 20.2% for low concentrated incident power density of 0.4 W/sq cm. Radiation damage on Ga As was studied. (Author (ESA)) Source of Abstract (Subfile): ESA Keywords: *GALLIUM ARSENIDES; *PH0T0V0LTAIC CELLS; ♦SOLAR CELLS; ♦SPACECRAFT ROWER SUPPLIES; ♦TECHNOLOGICAL FORECASTING; LIQUID PHASE EPITAXY; MELTS (CRYSTAL GROWTH); PHOTOVOLTAIC CONVERSION; RADIATION DAMAGE; SURFACE ROUGHNESS Subject Classification: 7520 Spacecraft Propulsion ?< Power (1975.) Arrays of horizontally polarized loop-fed slotted cylinder antennas. FENN, A. J. (MIT, Lexington, MA) IEEE Transactions on Antennas and Propagation (ISSN 0018—926X), vol. AP—33, April 1985, p. 375-382. USAF- sponsored research. 9 Refs. L anguag e: E n g1 ish. Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AIAA Technical Library Journa1 Announcement: IA A 8 513 Measured center element gain patterns, voltage standing-wave ratio (VSWR), and mutual coupling for passively terminated arrays of horizontally polarized loop- fed slotted cylinder antennas over a ground plane are given. A seven-element hexagonal array is investigated in detail. The element gain pattern is shown to have a null at broadside with omni di rectional coverage along a constant cone angle from broadside. Maximum gain occurs close to 50 deg from broadside which provides for wide-angle phased array scanning capability. The antennas are also conf1g u r e d i n a 1inear array geometry, to investigate mutua1 coup1ing effects on the element gain pattern as the number of elements is varied. The element gain pattern is shown to converge for a relatively few number of elements and there is no indication of undesired blind spots. (Author) Source of Abstract (Subfile): AIAA/TIS Keywords: *ANTENNA ARRAYS; *ANTENNA FEEDS; ♦CYLINDRICAL ANTENNAS; *L00P ANTENNAS; ♦POLARIZATION CHARACTERISTICS; ♦ SLOT ANTENNAS; ANTENNA DESIGN; ANTENNA RADIATION PATTERNS; LINEAR ARRAYS; PHASED ARRAYS; POWER GAIN; STANDING WAVE RATIOS Subject. Classification: 7532 Communications (1975-)
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