Accession Number : AD0458397

Title :   REDUCTION OF SHIPBOARD RADIO INTERFERENCE.

Descriptive Note : Status rept., 26 Jun 64-27 Feb 65 on study program related to shipboard antenna system environment.

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB

Report Date : 23 FEB 1965

Pagination or Media Count : 8

Abstract : A study was made of antennas in shipboard environments at frequencies of 2-30 mc. The disturbance of radiation patterns by superstructure and other obstacles, and the reduction of mutual coupling between antennas represented the two main problems for study. The first problem, that of pattern disturbance caused by superstructure, was approached by approximating the radiating source by an infinitely long line source, and the offending structure (of arbitrary shape) by an array of thin infinitely long wires outlining its surface. Such a cylindrical configuration approximates many practical shipboard situations and provides some basis for the location of antennas aboard ship. The second problem, that of radiation interference in the close confines of a ship, was approached via the characteriestic mode concept. Very briefly, this approach presumes that the radiation patterns of antennas located on a hull (at the low frequencies under discussion) are a sum of simpler patterns which are characterized by the hull shape alone. It was felt that the delineation of these patterns,or modes, could aid the decoupling problem if they were found to be orthogonal, they also could be used as a tool in aperture synthesis techniques and array design. (Author)

Descriptors :   (*RADIO INTERFERENCE, SHIPS), SHIP ANTENNAS, ANTENNA RADIATION PATTERNS, SHIP STRUCTURAL COMPONENTS, ELECTROMAGNETIC RADIATION, EQUATIONS, WIRE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE