Accession Number : AD0283768

Title :   AN EXPERIMENTAL STUDY OF THE INSULATED DIPOLE ANTENNA IMMERSED IN A CONDUCTING MEDIUM

Descriptive Note : Scientific rept.

Corporate Author : HARVARD UNIV CAMBRIDGE MASS GORDON MCKAY LAB

Personal Author(s) : IIZUKA,KEIGO

Report Date : 25 MAY 1962

Pagination or Media Count : 21

Abstract : The driving-point admittance and the amplitu e and phase distributions of the current referred to the driving-point were measured for an insulated cylindrical antenna immersed in a conducting medium. The ratio of the conducting medium was v ried from 0.036 to 8.8, a range which includesA VARIETY OF MEDIA SUCH AS POOR INSULATORS, THE IONOSPHERE, PLAS S, DRY EARTH, WET EARTH, LAKE WATER, AND SEA WATER. The antenna height in radians was varie fro 0.1 hrough pi at intervals of 0.1. The thickness of the insulator varied from b/a = 1.25 to b/a = 12.0, where a is the radius of the antenna and b the radius of the insulator. Mea urements were made of the admittance, current, and phase distributions along an insulated antenna with a conductive top load, that is, one whose tip is in direct contact with the conducting medium. When the tip of the antenna is in direct contact with the conducting medium, the current increases almost linearly as the end of ntenna is approached. This is quite unlike the decayi g sinusoidal distribution on the completely insulated antenna. The experimental results are in fair agreement with an approximate theoretical expression for the admittance of a insulated antenna immersed in a highly conducting solution. The approximate theory is based on a mo e-configuration method. (Author)

Descriptors :   *DIPOLE ANTENNAS, ADMITTANCE, CONDUCTIVITY, ELECTRIC CURRENTS, ELECTRICAL CONDUCTIVITY, INSULATION, MATERIALS, PHASE STUDIES, RESONANCE, THICKNESS, WATER

Distribution Statement : APPROVED FOR PUBLIC RELEASE