Accession Number : AD0467893


Title :   PATTERN HANDBOOK. VOLUME 3. FAR-FIELD PATTERNS OF A LINEAR ANTENNA RADIATING IN THE PRESENCE OF SQUARE CYLINDERS


Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB


Personal Author(s) : Brenner, C H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/467893.pdf


Report Date : 01 Aug 1965


Pagination or Media Count : 156


Abstract : The prediction of fields radiated by shipboard antennas is complicated by the presence of parasitically excited superstructure which warps and deteriorates the far-field patterns. If antennas are to be located in some logical manner on the ship, or if the ship design itself is to take account of the primary radiating elements, then some guides must be found to account for the influence of superstructure on antenna patterns. To this end, a handbook has been compiled giving patterns of a thin, linear, vertical antenna radiating in the presence of cylindrical conducting structures of various cross-sectional shape. The model used to approximate this configuration is that of an infinite line source, representing the dipole, radiating in the presence of an array of thin, infinite wires parallel to each other and outlining the surface of the offending cylindrical structure. It has been shown that such a wire approximation is electrically similar to the solid metallic surface if at least 5 wires per wavelength of perimeter are used. It has also been shown that the patterns obtained from the infinitely tall model in the plane normal to the cylinder axis are good approximations to those obtained from the actual finite height configuration so long as the offending structure is taller than the source antenna, preferably twice as tall.


Descriptors :   *ANTENNA RADIATION PATTERNS , *DIPOLE ANTENNAS , *SHIP ANTENNAS , ELECTRICAL CONDUCTIVITY , SHIP STRUCTURAL COMPONENTS , MATHEMATICAL PREDICTION , CYLINDRICAL BODIES , HANDBOOKS


Subject Categories : Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE