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IEEE Antennas and Propagation Magazine

Issue 6 • Date Dec. 1991

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Displaying Results 1 - 7 of 7
  • Evolution of the large Deep Space Network antennas

    Publication Year: 1991, Page(s):7 - 19
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1268 KB)

    The evolution of the largest antenna of the US NASA Deep Space Network (DSN) is described. The design, performance analysis, and measurement techniques, beginning with its initial 64-m operation at S-band (2295 MHz) in 1966 and continuing through the present Ka-band (32-GHz) operation at 70 m, is described. Although their diameters and mountings differ, these parabolic antennas all employ a Casseg... View full abstract»

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  • Circular sectoral waveguides

    Publication Year: 1991, Page(s):20 - 27
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (650 KB)

    Hollow cylindrical waveguides that have pie-shaped cross sections are described. The explicit equations for the field components of the TE (transverse electric) and TM (transverse magnetic) waves are given, and the modal patterns for a number of modes are plotted. The relation between the field distributions inside the circular and sectoral waveguides is discussed. It is shown that the electric an... View full abstract»

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  • SOUSY VHF radars and UV lidar for atmospheric research at MPAe

    Publication Year: 1991, Page(s):28 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A description is given of the SOUSY (sounding system) VHF radar, located in the Harz Mountains in Germany, which was constructed between 1974 and 1976 as one of the first-generation mesosphere, stratosphere, and troposphere (MST) radars. Its mobile counterpart, designed and built during the early 1980s for observational campaigns in remote locations, is also described. Some theoretical background ... View full abstract»

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  • Rapid evaluation of integer-order Bessel functions using an FFT algorithm

    Publication Year: 1991, Page(s):33 - 35
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    A rapid, accurate, and stable method for computing integer-order Bessel functions is presented. In contrast to the iterative procedures normally used in the numerical evaluation of Bessel functions, this approach requires little more than a commonly available fast Fourier transform algorithm, and yet, for a given argument, can provide many J/sub n/s in a single pass.<> View full abstract»

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  • Backyard Range-radio astronomy at Saint Mary's University, Halifax, Canada

    Publication Year: 1991, Page(s):63 - 65
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The Saint Mary's University (SMU) radio observatory, located on the roof of the university's McNally Administration Building, is described. The various antenna installations are used to conduct solar observations at the 21-, 7.5-, 5-, and 3-cm wavelengths. Facilities are also available for observations of the radio star Cassiopeia A. Two-element interferometer solar observations are routinely cond... View full abstract»

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  • Antenna mechanic-more effective design of mechanical buffers for steerable antennas

    Publication Year: 1991, Page(s):67 - 70
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

    Discusses three true stories of catastrophes caused by antenna runaway, gives some design advice on mechanical buffers, and provides a worked example to illustrate the design methods. Although it may seem unlikely that certain events could happen concurrently (stuck limit switch, high wind, etc.), the consequences should be carefully weighed against the cost of designing buffers to prevent equipme... View full abstract»

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  • Antenna Designer's Notebook-simulation of slot array antennas using standard network analysis program

    Publication Year: 1991, Page(s):45 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    It is shown how equivalent circuit models can be employed in a supercompact circuit simulation to investigate arrays of offset longitudinal broad-wall slots and tilted narrow-wall slots. An investigation of double broad-wall slots in a half-height waveguide is reported as an example of the use of the technique. The results can be used to optimize array bandwidth and to check the consequences of an... View full abstract»

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