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  • 1
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    Volumetric pattern analysis of airborne antennas (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: By blending together the roll and elevation plane high frequency solutions, a very efficient technique was developed for the volumetric pattern analysis of antennas mounted on the fuselage of a generalized aircraft. The fuselage is simulated by an infinitely long, perfectly conducting, elliptic cylinder in cross-section and a composite elliptic cylinder in profile. The wings, nose section, stabilizers, and landing gear doors may be modeled by finite flat or bent plates. Good agreement with accurate scale model measurements was obtained for a variety of airborne antenna problems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-78327 , ESL-78-2902 , FR-2902-27
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Volumetric pattern analysis of fuselage-mounted airborne antennas (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A volumetric pattern analysis of fuselage-mounted airborne antennas at high frequencies was investigated. The primary goal of the investigation was to develop a numerical solution for predicting radiation patterns of airborne antennas in an accurate and efficient manner. An analytical study of airborne antenna pattern problems is presented in which the antenna is mounted on the fuselage near the top or bottom. Since this is a study of general-type commercial aircraft, the aircraft was modeled in its most basic form. The fuselage was assumed to be an infinitely long perfectly conducting elliptic cylinder in its cross-section and a composite elliptic cylinder in its elevation profile. The wing, cockpit, stabilizers (horizontal and vertical) and landing gear are modeled by "N" sided bent or flat plates which can be arbitrarily attached to the fuselage. The volumetric solution developed utilizes two elliptic cylinders, namely, the roll plane and elevation plane models to approximate the principal surface profile (longitudinal and transverse) at the antenna location. With the belt concept and the aid of appropriate coordinate system transformations the solution can be used to predict the volumetric patterns of airborne antennas in an accurate and efficient manner. Applications of this solution to various airborne antenna problems show good agreement with scale model measurements. Extensive data are presented for a microwave landing antenna system.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-147099 , TR-2902-24
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A study of KC-135 aircraft antenna patterns (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Numerical solutions for the radiation patterns of aircraft antennas provide and excellent means of designing and locating antennas in order to achieve the desired performance. The high frequency solutions presented in this paper are based on fuselage antennas mounted on a general-type aircraft but applied specifically to the KC-135 aircraft. The roll and elevation plane patterns are computed for a monopole, axial slot, and circumferential slot mounted both over and forward of the wings. In each case the calculated patterns compare very favorably with the measured patterns. The precision pattern measurements were taken on a 1/25 scale model of the KC-135 aircraft at NASA (Hampton, Va.) with special emphasis on reducing the mount and background effects.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: IEEE Transactions on Antennas and Propagation; AP-23; May 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Research on MLS airborne antenna (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Numerical solutions for the radiation patterns of antennas mounted on aircraft are developed. The airborne antenna problems associated with the Microwave Landing System (MLS) are emphasized. Based on the requirements of the MLS, volumetric pattern solutions are essential. Previous attempts at solving for the volumetric patterns were found to be far too complex and very inefficient. However as a result of previous efforts, it is possible to combine the elevation and roll plane pattern solutions to give the complete volumetric pattern. This combination is described as well as the aircraft simulation models used in the analysis. A numerical technique is presented to aid in the simulation of the aircraft studied. Finally, a description of the input data used in the computer code is given.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-146844 , SAR-2902-23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    MLS airborne antenna research (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The geometrical theory of diffraction was used to analyze the elevation plane pattern of on-aircraft antennas. The radiation patterns for basic elements (infinitesimal dipole, circumferential and axial slot) mounted on fuselage of various aircrafts with or without radome included were calculated and compared well with experimental results. Error phase plots were also presented. The effects of radiation patterns and error phase plots on the polarization selection for the MLS airborne antenna are discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-145393 , SAR-2902-22
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Volumetric pattern analysis of airborne antennas (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: By blending together the roll and elevation plane high-frequency solutions, a very efficient technique has been developed for the volumetric pattern analysis of antennas mounted on the fuselage of a generalized aircraft. The fuselage is simulated by an infinitely long, perfectly conducting, elliptic cylinder in cross section and a composite elliptic cylinder in profile. The wings, nose section, stabilizers, and landing-gear doors may be modeled by finite flat or bent plates. Good agreement with accurate scale model measurements has been obtained for a variety of airborne antenna problems.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: IEEE Transactions on Antennas and Propagation; AP-26; Sept
    Format: text
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    NASA TECHNICAL REPORTS
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