Accession Number : ADA138206

Title :   An Experimental Study of Cylindrical Antennas Radiating in or Near a Lossy Half Space.

Descriptive Note : Final rept. 15 Mar 82-20 Jun 83,


Personal Author(s) : Butler,C M ; Harrison,C A

PDF Url : ADA138206

Report Date : Dec 1983

Pagination or Media Count : 171

Abstract : Conducting structures residing near, within and partially within a lossy half space are investigated experimentally. The conducting structures are modeled by monopole antennas, and the lossy half space is modeled by the water within a non-metallic tank. Antenna aperture admittances are obtained using swept-frequency network analysis techniques with automated data collection and reduction. Results are compared to results of numerical analysis conducted as a related project. A sleeve monopole is oriented normal to the water surface with driving point near the bottom of the tank and source gap (aperture) in air. Gap height above the water surface, antenna radius and monopole length are varied. Electromagnetic properties of the water are varied by addition of NaC1. Coax-fed wire antennas are mounted perpendicular to a ground plane which is normal to and intersects the water surface. The antennas used are a straight-wire antenna in which the monopole is parallel to the water surface and a bent-wire antenna in which the wire is partially immersed in water. Height of the aperture above the water is varied. A coax-fed cylindrical monopole antenna is mounted perpendicular to a ground plane which is in contact with the water surface so that monopole and aperture are immersed in water. (Author)

Descriptors :   *Cylindrical antennas, *Monopole antennas, *Liquid immersion tests, Numerical analysis, Data acquisition, Surfaces, Electric wire, Radius(Measure), Salt water, Automation, Bottom, Sodium chloride, L band, Water, Experimental data, Nonmetals, Wire, Antennas, Salinity

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE