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IEEE Antennas and Propagation Magazine

Issue 3 • Date June 1991

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Displaying Results 1 - 7 of 7
  • A secret story about the Yagi antenna

    Publication Year: 1991, Page(s):7 - 18
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1266 KB)

    A hitherto unpublicized story about a note thrown away by a British soldier named Newmann in Singapore during World War II, which revealed to the Japanese that the Yagi-Uda antenna was being used by the British in radar systems, is related. The invention of the Yagi-Uda antenna and its practical use in Europe are briefly discussed, and the role of radar and the Yagi-Uda antenna in Japan's defeat i... View full abstract»

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  • A modern giant Yagi

    Publication Year: 1991, Page(s):19 - 21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB)

    A giant HF divided-boom Yagi antenna designed, constructed, and demonstrated by radio amateurs is described. The antenna, designed using the method-of-moments MININEC wire code, consists of 13 widely-spaced elements disposed on six towers, in a fixed-azimuth application. Overall antenna dimensions are 10 m by 100 m by 25 m above the ground: a structure roughly 0.5*5.0*1.0 wavelengths in the WARC-a... View full abstract»

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  • A finite-element-boundary-integral method for scattering and radiation by two- and three-dimensional structures

    Publication Year: 1991, Page(s):22 - 32
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (811 KB)

    A hybrid finite-element-boundary-integral formulation for scattering and radiation by 2-D and 3-D composite structures is described. In contrast to other hybrid techniques involving the finite-element method, the method is in principle exact, and can be implemented using low O(N) amounts of storage. This is of particular importance for large-scale applications, and is a characteristic of the bound... View full abstract»

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  • Microstrip antenna developments at JPL

    Publication Year: 1991, Page(s):33 - 41
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    The in-house development of microstrip antennas, initiated in 1981, when a spaceborne lightweight and low-profile planar array was needed for a satellite communication system, is described. The work described covers the prediction of finite-ground-plane effects by the geometric theory of diffraction, higher-order-mode circularly polarized circular patch antennas, circularly polarized microstrip ar... View full abstract»

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  • Gain optimization for Yagi-Uda arrays

    Publication Year: 1991, Page(s):42 - 46
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The author presents a personal account of the search for a design procedure for Yagi-Uda antenna arrays yielding a maximum gain, or directivity if element losses are neglected. Results on current distributions in the array are briefly reviewed. The analytical approach used to achieve gain optimization by means spacing and length perturbations is sketched. By using both spacing and length perturbat... View full abstract»

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  • Antenna designer's notebook-design of pyramidal horns for fixed phase center as well as optimum gain

    Publication Year: 1991, Page(s):53 - 55
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (175 KB)

    A method for designing a pyramidal horn with optimum gain and a phase center that is insensitive to horn rotation over a wide frequency band is presented. The optimum gain comes out to be about 14 dB; ways to increase the optimum gain are suggested. The design is based on a far-field formulation and is useful for common applications. However, a parallel procedure based on a near-field formulation ... View full abstract»

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  • Measurements column (antenna testing)

    Publication Year: 1991, Page(s):57 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (299 KB)

    The alignment of the mechanical axes of a compact range test positioner to the compact range wavefront is addressed. Reflection measurements are used to calibrate the range and to determine the gain of antennas. It is shown that the circular flat plate and the vertical wire are accurate electrical alignment tools for the field direction and the polarization vector. With the plate, it was possible ... View full abstract»

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