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  • 1
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    Input impedance of microstrip antennas (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Using Richmond's reaction integral equation, an expression is derived for the input impedance of microstrip patch antennas excited by either a microstrip line or a coaxial probe. The effects of the finite substrate thickness, a dielectric protective cover, and associated surface waves are properly included by the use of the exact dyadic Green's function. Using the present formulation the input impedance of a rectangular microstrip antenna is determined and compared with experimental and earlier calculated results.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation; AP-30; July 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Astronomical camera using a high-performance indium antimonide linear array (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The development and current status of InSb line arrays for astronomy are reviewed. Instrument concepts are currently being developed for an infrared instrument for NASA's Space Telescope which would use such detectors for both spectroscopy and imaging. Preliminary performance measurements are given for a simple pushbroom camera, using a 128-element line array, designed for operation on the 24-inch Cassegrain telescope at the JPL Table Mountain Observatory. The design and construction of the camera are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    High temperature static strain gage program (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Development of electrical resistance strain gages for static strain measurements of nickel or cobalt superalloy parts inside a gas turbine engine on a test stand was inititated. Measurements of this type are of great importance because without reliable knowledge of the stresses and strains which exist in specific components, it will be difficult to fully appreciate where improvements in design and materials can be implemented. The first part of this effort consists of a strain gage alloy development program which will be followed by an investigation of complete strain gage systems. Efforts to date are summarized.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Lewis Research Center Turbine Engine Hot Section Technology, 1984; 6 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    High temperature static strain sensor development program (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Electrical resistance strain gages useful for static strain measurements on nickel or cobalt superalloy parts inside a gas turbine engine on a test stand are being developed. Measurements of this type are of great importance in meeting the goals of the HOST program because, without reliable knowledge of the stresses and strains which exist in specific components, it will be difficult to fully appreciate where improvements in design and materials can be implemented. The first part of the effort consisted of a strain gage alloy development program which will be followed by an investigation of complete strain gage systems which will use the best of the alloys developed together with other system improvements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Lewis Research Center Turbine Eng. Hot Sect. Technol. (HOST); p 37-40
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Development of a 611 MHz feed for a 9-meter reflector (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 2 by 2 array of fan dipoles was designed as a feed for an existing 9.14 meter diameter reflector. Baffles (conducting fences) were utilized to reduce mutual coupling between dipoles and to improve the feed radiation pattern in the H plane. Significant strut scattering effects are noted in the secondary patterns of the reflector antenna.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-86300 , NAS 1.15:86300
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    An investigation of the existence of a surface water layer on aircraft radomes during simulated flight in heavy precipitation (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experiment to investigate the electromagnetic attenuation effects of an impacting water spray on an aircraft weather radome was conducted in Langley's 4 X 7 m. wind tunnel equipped with a water spray system. Results indicate no significant liquid water film formed at the stagnation point of the radome under the test conditions. However, a water sheath was observed standing away from the radome surface, which could possibly have significant attenuation properties of its own. Due to the lack of fidelity in modeling both the natural environment with the tunnel apparatus and the water sheath, it is recommended that further studies be undertaken to better define the water distribution in the vicinity of the radome and measure its effect on weather radar performance.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-85813 , NAS 1.15:85813
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Analysis of rectangular microstrip antennas (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The problem of microstrip antennas covered by a dielectric substrate is formulated in terms of coupled integro-differential equations with the current distribution on the conducting patch as an unknown quantity. The Galerkin method is used to solve for the unknown patch current. Using the present formulation, the radiation pattern, the resonant frequency, and the bandwidth of a rectangular microstrip antenna are computed. Design data for a rectangular microstrip antenna are also presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TP-2276 , L-15698 , NAS 1.60:2276
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    A simple stripline design for uneven power split (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A technique for the design of stripline or microstrip power dividers for unequal, but in-phase, power split is described. The output power ratio is determined by selecting the location of the input port in a manner analogous to the tap point for an electric power transformer. The technique yields a usable bandwidth of 7 to 8 percent and is attractive for tapered amplitude distribution networks for narrow band phased arrays.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-81870
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    A bounds on the resonant frequency of rectangular microstrip antennas (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The calculation of currents induced by a transverse electric plane wave normally incident upon an infinite strip embedded in a grounded dielectric slab is used to infer a lower bound on the resonant frequency (or resonant-E-plane dimension) for rectangular microstrip antennas. An upper bound is provided by the frequency for which the E-plane dimension is a half-wavelength.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-81882
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Integrating 128-element linear imager for the 1 to 5 microns region (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Useful charge integration has been achieved in high quality photovoltaic InSb diodes when combined with a FET multiplexing (MUX) scheme. An experimental detector assembly with a linear array of 128 InSb diodes coupled to a FEX MUX has been developed. The first stage J-FET preamp, pixel reset switch, MUX, and the InSb array are contained in a hybrid microcircuit of compact dimensions. A low noise preamplifier topology which capitalizes on the low video line capacitance inherent with hybrid fabrication techniques is also utilized. Measurements indicate a signal-to-noise ratio of over 1000:1 and response uniformity of + or - 2 percent. Sample images show subtle detail which supports the estimated radiometric sensitivity of 0.01 K.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Mosaic focal plane methodologies II; Conferenc; Aug 27, 1981 - Aug 28, 1981; San Deigo, CA
    Format: text
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    NASA TECHNICAL REPORTS
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