Accession Number : AD0463370


Title :   FAR-FIELD PATTERN PREDICTION FOR SHIPBOARD ANTENNAS


Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB


Personal Author(s) : Thiele, Gary A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/463370.pdf


Report Date : 31 Mar 1965


Pagination or Media Count : 52


Abstract : Shipboard antennas operate in the vicinity of the ship's super- structure which consists of numerous metallic scatterers of various sizes and shapes. The far-field patterns of shipboard antennas are perturbed by these scat/scatterers and are therefore difficult to predict. In this report a method is discussed for approximating the far-field pattern in the horizontal plane of a thin vertical antenna (e.g., a whip antenna) near cylindrical scatterers of arbitrary cross-section whose physical heights are at least that of the antenna. The method is based on approximating the antenna with an infinite line source and the scatterer with an array of thin infinite wires. Some representative calculated and experimental results are presented which generally show very good agreement between the predicted and measured patterns. In addition, limitations of the method are discussed and the computer programs for calculating the far-field patterns are explained in some detail.


Descriptors :   *ANTENNA RADIATION PATTERNS , *SHIP ANTENNAS , ELECTROMAGNETIC SCATTERING , ELECTROMAGNETISM , ELECTRIC WIRE


Subject Categories : Radiofrequency Wave Propagation
      Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE