Accession Number : AD0660543

Title :   THE HELICAL ANTENNA AND ITS PROBLEMS.

Descriptive Note : Scientific rept. no. 1, 1 Jul 65-1 Jan 67,

Corporate Author : INNSBRUCK UNIV (AUSTRIA)

Personal Author(s) : Bitterlich,Wolfram

Report Date : 01 MAR 1967

Pagination or Media Count : 40

Abstract : Problems are discussed which result from the use of helical antennas in a dissipative medium at low frequencies. A network model for helical antennas surrounded by rock with the conductivity sigma and the dielectrical constant epsilon, is used for deriving theoretical expressions for the real part and imaginary part of the input impedance in the case of quasistationary currents. The field structure to be expected and the different types of propagation are discussed in brief. The antennas examined by experiment are described and the measured results are compared with the theoretical values. (Author)

Descriptors :   (*HELICAL ANTENNAS, LOW FREQUENCY), UNDERGROUND ANTENNAS, VERY LOW FREQUENCY, ELECTRICAL IMPEDANCE, PERFORMANCE(ENGINEERING), MATHEMATICAL MODELS, PROPAGATION, ROCK, ELECTROMAGNETIC FIELDS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE