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  • 1
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    An analysis technique for microstrip antennas (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The paper presents a combined numerical and empirical approach to the analysis of microstrip antennas over a wide range of frequencies. The method involves representing the antenna by a fine wire grid immersed in a dielectric medium and then using Richmond's reaction formulation (1974) to evaluate the piecewise sinusoidal currents on the grid segments. The calculated results are then modified to account for the finite dielectric discontinuity. The method is applied to round and square microstrip antennas.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation; AP-25; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Resonant frequency of microstrip antennas calculated from TE-excitation of an infinite strip embedded in a grounded dielectric slab (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The calculation of currents induced by a plane wave normally incident upon an infinite strip embedded in a grounded dielectric slab is used to infer the resonant width (or frequency) of rectangular microstrip antennas. By placing the strip inside the dielectric, the effect of a dielectric cover of the same material as the substrate can be included in the calculation of resonant frequency. A comparison with measured results indicated agreement of 1 percent or better for rectangular microstrip antennas constructed on Teflon-fiberglass substrate.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-80190
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Design of microstrip disk antenna arrays (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The radio frequency characteristics and design parameters for microstrip disk antenna elements and planar arrays are presented. Two C-band model arrays (an 8 element linear and an 8 by 8 planar) were designed, fabricated, and tested to demonstrate the technique of using microstrip elements for array applications. These arrays were designed with a cosine amplitude distribution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-78631 , L-11926
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Mutual admittance between circular waveguide-fed apertures for large spacing (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A closed-form asymptotic expression for the mutual admittance between two circular waveguide-fed apertures is developed for large element spacings. A comparison with calculations obtained by a numerical integration method indicated that the present analysis gives good results for spacings greater than two wavelengths.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-74054
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A synthetic aperture processor using CCD signal processing techniques (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Synthetic aperture radar (SAR) imaging was the most suitable technique for achieving high resolution imagery through atmospheric cloud cover. This feature was important for planetary as well as earth orbiting satellite systems, and for military aircraft applications. Such applications require onboard data processing or wide-band data transmission systems in order to handle the large amounts of raw data produced by such systems. A number of techniques were utilized in implementing SAR processors. Frequency filtering and Fourier transform operations using both optical and digital techniques were utilized in SAR processing.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL Conf. on Charge-Coupled Device Technol. and Appls.; p 21-32
    Format: text
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    NASA TECHNICAL REPORTS
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