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  • 1
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    Unknown
    Dipole-Excited Ring Antenna (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Dipole radiator drives ring radiator in compact C-band antenna. Antenna can be mounted flush with surface. Compared with horn or parabolic dish with same aperature, new ring antenna has greater gain, lower side lobes, and narrower beam width. Used on vehicles requiring flush-mounted antennas with very directive signals. Used as radar altimeter antenna for aircraft.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: MSC-20201 , NASA Tech Briefs (ISSN 0145-319X); 7; 1; P. 12
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Spiral slotted phased antenna array (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flush mounting, cavity-backed, dual orthogonal slot antenna for aircraft and space vehicles is described. Improved radiation pattern characteristics are obtained by making the spiral slot pattern elliptical in the aperture plane. A cavity and a flanged aperture plate are configured such that one slot pair is orthogonal with respect to another slot pair within the aperture plate. Coaxial split-tube baluns are used to drive the junctions between corresponding slot pairs. An optional cavity dielectric is provided and a drive coupling arrangement includes a four port comparator hybrid having sum and difference ports respectively, for alternate excitation to produce a single lobe or a double lobe pattern with null. Switching apparatus is provided to connect a common terminal to either of the ports.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Coaxial phased array antenna (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A coaxial antenna array for communicating circularly polarized electromagnetic radiation is disclosed. A pair of open ended antenna cavities is coaxially constructed and operates by excitation of linear radiation elements arranged within each of the cavities. A pair of crossed dipole radiation devices is centered within the inner cavity and operated by means of a phase shifting network circuit to transmit as well as receive circularly polarized radiation. Four monopole radiation devices are symmetrically arranged to operate in the outer cavity in phase quadrature by means of the phase shifting network circuit to both transmit and receive circularly polarized electromagnetic radiation. Combined operation of the two antenna cavities with a 180 deg phase differential between the fields related to the two antenna cavities provides a broad beam, relatively wide frequency bandwidth communication capability. Particular embodiments disclosed feature a generally square cavity array as well as a circular cavity array.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Trislot-cavity microstrip antenna (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Flush-mountable assembly composed of disk radiator sandwiched between planes of metal-clad dielectric board has greater bandwidths and beamwidths than simple disk antenna. Conducting planes connect so that disk is enclosed in cavity with Y-shaped slot in top plane. Cavity is excited by microwave energy from disk and radiates from trislot aperature.
    Keywords: ELECTRONIC SYSTEMS
    Type: MSC-18793 , NASA Tech Briefs (ISSN 0145-319X); 5; 4; P. 422
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Wide-beam flush-mounted antenna (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Compact six-element S-band phased-array antenna produces exceptionally broad, circularly polarized beam and wide bandwidth. Suitable for flush mounting, antenna may be useful in high altitude aircraft, communication satellites, and ground-based moving vehicles.
    Keywords: ELECTRONIC SYSTEMS
    Type: MSC-16800 , NASA Tech Briefs (ISSN 0145-319X); 4; 2; P. 184
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Unknown
    Cavity-backed, micro-strip dipole antenna array (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flush-mounted antenna assembly includes a generally rectangular, conductive, box structure open along one face to form a cavity. Within the cavity a pair of mutually orthogonal dielectric plane surfaces in an "egg crate" arrangement are mounted normal to the plane of the open face, each diagonally within the cavity. Each dielectric plane supports a pair of printed circuit dipoles typically each fed from the opposite side of the dielectric plane by a printed "cone-shaped" feed line trace which also serve as an impedance matching device and functions as a balun connected from an unbalanced strip line external feed. The open face of the conductive cavity can be flush mounted with a randome thereover, the assembly thereby being flush with the skin of a aircraft or space vehicle.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Unknown
    Cavity-backed spiral-slot antenna (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Compact, rugged, flush-mounted antenna operates in sum or difference modes with circular polarization. Radiating elements consist of two pairs of centerfed, interleaved spiral slots in conductive aperature plane. At center feedpoint of each slot pair is balanced feed assembly. Center points are fed from split-tube coaxial balun passing through quarter-wave length deep cavity. Circularly polarized patterns represent both rceived and transmitted signals.
    Keywords: ELECTRONIC SYSTEMS
    Type: MSC-18532 , NASA Tech Briefs (ISSN 0145-319X); 5; 4; P. 421
    Format: text
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    NASA TECHNICAL REPORTS
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